Datasheet ACD82112 Datasheet (ACD)

1

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

Data Sheet: ACD821 12

12 Ports 10/100 Fast Ethernet Switch

Rev .1.3.4.I

Last Update: March 20, 1999

Subject to Chnage

ACD Confidential Material

For ACD authorized customer use only . No reproduction or redistribution without ACD’s prior permission.

Please check ACD’s website for update

information before starting a design

Web site: http://www.acdcorp.com

or Contact ACD at:

Email: [e-mail]

T el: 408-433-9898

Fax: [phone]

Advanced

Communication

Devices

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Data Sheet: ACD8211 2

INTRODUCTORY

Table of Contents

Page

1 General Description 3
2 Main Features 3
3 System Block Diagram 3
4System Description 4
5 Functional Descr iption 4
6 Inter fac e Descr iption 11
7 Register Description 16
8 Pin Description 25
9 Timing Descripti on 28
10 Electr ical Specifications 34
11 Packaging 35

Appendix

A1 Address Resolution Logic 36

(The built -in AR L)

Section

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Data Sheet: ACD8211 2

INTRODUCTORY

Buffer

Queue Manager

Lookup Engine

(2K MAC Addr.)

LED ControllerBIST Handler

ARL

ACD80800

(11K MAC Addr.)

(optional)

MIB

ACD80900

(optional)

ARL Interface

SRAM

MAC-0

MAC-1

MAC-10

MAC-11

SRAM Interface MIB Interface

PMD/

PHY-0

PMD/

PHY-1

PMD/

PHY-10

PMD/

PHY-11

MX

DMX

Buffer

Buffer

Buffer

Buffer

Buffer

Buffer

Buffer

FIFO

FIFO

FIFO

FIFO

FIFO

FIFO

FIFO

FIFO

ACD82112

3. SYSTEM BLOCK DIAGRAM

1. GENERAL DESCRIPTION

The ACD821 12 is a single chip implementation of a 12
port 10/100 Ethernet switch system intended for IEEE

802.3 and 802.3u compatible networks. The device in­cludes 12 independent 10/100 MACs. Each MAC inter­faces with an external PMD/PHY device through a stan­dard MII interface. Speed can be automatically config­ured through the MDIO or the optional CPU UART . Each
port can operate at either 10Mbps or 100Mbps, in half­duplex or full-duplex mode. The core logic of the
ACD82112, implemented with patent pending BASIQ

(Bandwidth Assured Switching with Intelligent Queu­ing)

technology, can simultaneously process 12 asyn­chronous 10/100Mbps traffics. The Queue Manager in­side the ACD82112 provides the capability of routing
traffic with the same order of sequence, without any
packet loss.

A complete 12 port 10/100 switch can be built with the
use of the ACD82112, 10/100 PHY and SRAM. The
MAC addresses space can be expanded from the built­in 2K to 11K by using ACD’s external ARL (

Address

Resolution Logic)

, the ACD80800. Advanced network
management features can be supported with the use of
ACD’s

MIB (Management Information Base,

ACD80900)

chip.

2. MAIN FEATURES

• 12 - 10/100 Mbps, auto-sensing ports with MII in­terface

• Full / half duplex operation

• 2.4 Gbps aggregated throughput

• True non-blocking switch architecture

• Shared buffer with starvation control algorithm

• Built-in storage of 2,048 MAC addresses

• Automatic source address learning

• Optional back-pressure (half duplex) flow control

• 802.3x pause frame (full duplex) flow control

• Store-and-forward switch mode

• Port based VLAN support

• UART type CPU management interface

• Supports up to 11K addresses with External ARL

controller, the ACD80800

• RMON and SNMP support with External MIB con­troller, the ACD80900

• Status LEDs: Link, Speed, Full/Half Duplex, Trans­mit, Receive, Collision and Frame Error

• Reversible MII option for CPU and expansion port
interface, with hardware based flow control

• Wire speed forwarding rate

• 388-pin PBGA package (including 36 Thermal

Ground pins at the center)

• 3.3V power, 3.3V I/O with 5V tolerance

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INTRODUCTORY

Preamble SFD DA SA Type/Len Data FCS

4. SYSTEM DESCRIPTION

The ACD821 12 is a single chip implementation of a 12­port Fast Ethernet switch. T ogether with external SRAM
devices and transceiver devices, it can be used to build
a complete 10/100 Mbps Fast Ethernet switch. Each
individual port can be either auto-sensing or manually
selected to run at 10 Mbps or 100 Mbps speed rates
and under Full or Half-duplex mode.

The ACD82112 Ethernet switch contains three major
functional blocks: the Media Access Controller (MAC),
the Queue Manager, and the Lookup Engine.

There are 12 independent MACs within the ACD82112.
The MAC controls the receiving, transmitting, and de­ferring process of each individual port, in accordance
to the IEEE 802.3 and 802.3u standards. The MAC logic
also provides framing, FCS checking, error handling,
status indication and flow control functions. Each MAC
interfaces with an external transceiver through a stan­dard MII interface.

The device utilizes ACD’s proprietary BASIQ (Band­width Assured Switching with Intelligent Queuing) tech­nology . It is a technology to efficiently enforce the first­in-first-out rule of Ethernet Bridge-type devices. The
technology enables a true non-blocking frame switch­ing operation at wire speeds for a high throughput and
high port density Ethernet switch.

The on-chip Lookup Engine implements a 2,048 entries
MAC address lookup table. It maps each destination
address into a corresponding port. Each MAC address
is automatically learned by the LOOKUP ENGINE after
an error-free frame is received. Therefore, the
ACD821 12 alone can be used to build a complete Fast
Ethernet switch with up to 2,048 host connections

. (For
detailed information about the built-in ARL, please re­fer to the ACD80800 data sheet.)

For workgroup or backbone switches, the ACD82112
can support more MAC addresses per port through the
use of an external ARL chip, the ACD80800. The
ACD82112 has a glueless ARL interface that allows a
supporting chip (ACD80800) to provide up to 1 1K MAC
addresses per switch. System designers can also use
this ARL interface to implement a vendor-specific ad­dress resolution algorithm.

The ACD821 12 provides management support through
its MIB (Management Information Base) interface. The
MIB interface can be used to monitor all traffic activities
of the switch system. The supporting chip (the
ACD80900) provides a full set of statistical counters to
support both SNMP and RMON network management
functions. System designers can also use the MIB in-

terface to implement vendor-specific network manage­ment functionality .

Among the 12 MII interfaces, 5 of them can be config­ured as reversed MII, to connect directly with stand­alone MAC controller devices. A MAC in the ACD821 12
can be viewed logically as a PHY device if it is config­ured as the reversed MII interface. Reversed MII is in­tended for a CPU network interface, or an expansion
port interface.

The System CPU can access various registers inside
the ACD82112 through a serial CPU management in­terface. The CPU can configure the switch by writing
into the appropriate registers, or retrieve the status of
the switch by reading the corresponding registers. The
CPU can also access the registers of external trans­ceiver (PHY) devices through the CPU management
interface.

5. FUNCTIONAL DESCRIPTION

The MAC controller performs transmit, receive, and de­fer functions, in accordance to the 802.3 and 802.3u
specification. The MAC logic also handles frame detec­tion, frame generation, error detection, error handling,
status indication and flow control functions. Under full­duplex mode, the flow control is implemented in compli­ance with IEEE 802.3x standard.

Frame Format
The ACD821 12 assumes that the received data packet

will have the following format:

Where,

Preamble

is a repetitive pattern of ‘1010….’ of any length

with nibble alignment.

The

SFD

(Start Frame Delimiter) is defined as an octet

pattern of 1010101 1.

The

DA

(Destination Address) is a 48-bit field that speci­fies the MAC address of the destined DTE. If the first
bit of DA is 1, the ACD82112 will treat the frame as a
broadcast/multicast frame and will forward the frame to
all ports within the source port’s VLAN except the source
port itself or BPDU address.

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INTRODUCTORY

The

SA

(Source Address) is a 48-bit field that contains
the MAC address of the source DTE that is transmitting
the frame to the ACD82112. After a frame is received
with no error, the SA is learned as the port’s MAC ad­dress.

The

Type/Len

field is a 2-byte field that specifies the
type (DIX Ethernet frame) or length (IEEE 802.3 frame)
of the frame. The ACD821 12 does not process this in­formation.

The

Data

is the encapsulated information within the
Ethernet Packet. The ACD821 12 does not process any
of the data information in this field.

The

FCS

(Frame Check Sequence) is a 32-bit field of
CRC (Cyclic Redundancy Check) value based on the
destination address, the source address, the type/length
and the data field. The ACD82112 will verify the FCS
field for each frame. The procedure for computing FCS
is described in the section “FCS Calculation.”

Start of Frame Detection
When a port’s MAC is idle, assertion of the RXDV in

the MII interface will cause the port to go into the re­ceive state. The MII presents the received data in 4-bit
nibbles that are synchronous to the receive clock (25Mhz
or 2.5MHz). The ACD821 12 will convert this data into a
serial bit stream, and attempt to detect the occurrence
of the SFD (10101011) pattern. All data prior to the
detection of SFD are discarded. Once SFD is detected,
the following frame data are forwarded and stored in
the buffer of the switch.

Frame Reception
Under normal operating conditions, the ACD821 12 ex-

pects a received frame to have a minimum inter frame
gap (IFG). The minimum IFG required by the device is
64 BT .

In the event the ACD821 12 receives a packet with IFG
less than 64 BT, the ACD82112 does not guarantee to
be able to receive the frame. The packet will be dropped
if the ACD821 12 cannot receive the frame.

The device will check all received frames for errors such
as symbol error, FCS error , short event, runt, long event,
jabber, etc. Frames with any kind of error will not be
forwarded to any port.

Preamble Bit Processing
The preamble bit in the header of each frame will be

used to synchronize the MAC logic with the incoming
bit stream. The minimum length of the preamble is 0 bits
and there is no limitation on the maximum length of pre­amble. After the receive data valid signal RXDV is as­serted by the external PHY device, the port will wait for
the occurrence of the SFD pattern (10101011) and then
start a frame receiving process.

Source Address and Destination Address
After a frame is received by the ACD82112, the em-

bedded destination address and source address are
retrieved. The destination address is passed to the lookup
table to find the destination port. The source address is
automatically stored into the address lookup table. For
applications that uses an external ARL, the ACD821 12
will disable the internal lookup table and pass the DA
and SA to the external ARL for address lookup and
learning.

During the receive process, the Lookup Engine will at­tempt to match the destination address with the addresses
stored in the address table. If there is a match found, a
link between the source port and the destination port is
then established. If an external ARL is used, the
ACD821 12 indicates the presence of 48-bit DA through
the status line of the ARL interface. The external ARL
will use the value of DA for address comparison and
return a result of the lookup to the ACD821 12.

Frame Data
Frame data are transparent to the ACD82112. The

ACD82112 will forward the data to destination port(s)
without interpreting the content of the frame data field.

FCS Calculation
Each port of the ACD821 12 has a CRC checking logic

to verify if the received frame has a correct FCS value.
A wrong FCS value is an indication of a fragmented
frame or a frame with frame bit error. The method of
calculating the CRC value is using the following polyno­mial,

G(x) = x32 + x26 + x23 + x22 + x16 + x12 + x

11

+ x

10

+ x8 + x7 + x5 + x4 + x2 + x + 1

as a divider to divide the bit sequence of the incoming
frame, beginning with the first bit of the destination ad­dress field, to the end of the data field. The result of the

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Data Sheet: ACD8211 2

INTRODUCTORY

calculation, which is the residue after the polynomial
division, is the value of the frame check sequence. This
value should be equal to the FCS field appended at the
end of the frame. If the value does not match the FCS
field of the frame, the Frame Bit Error LED of the port
will be turned on once and the packet will be dropped.

Illegal Frame Length
During the receiving process, the MAC will monitor the

length of the received frame. Legal Ethernet frames
should have a length of not less than 64 bytes and no
more than 1518 bytes. If the carrier-sense signal of a
frame is asserted for less than 76 BT , the frame is flagged
with short event error. If the length of a frame is less
then 512 BT, the frame is flagged with runt error .

In order to support an application where extra byte length
is required, an Extra long frame option is provided. When
the Extra long frame option is enabled

(T able-7.24, bit-

7)

, only frames longer than 1530 bytes are marked with
a long event error. Frame length is measured from the
first byte of DA to the last byte of FCS.

Frame Filtering
Frames with any kind of error will be filtered. Types of

error include code error (indicated by assertion of RXER
signal), FCS error, alignment error, short event, runt,
and long event.

Any frame heading to its own source port will be fil­tered.

When external ARL is used, the filtering decision will be
made by the ARL. The ACD82112 will act in accor­dance with the ARL’ s direction.

If the

Spanning T ree Support

option is enabled, frames
containing DA equal to any reserved Bridge Manage­ment Group Address specified in T able 3.5 of the IEEE

802.1D will not be forwarded to any ports, except Port­11, which may receive BPDU frames. If spanning tree
support is not enabled, frames with DA equal to the
reserved Group Address for PBDU will be broadcasted
to all ports in the same VLAN of the source port.

Jabber Lockup Protection
If a receiving port is active continuously for more than

50,000 bit times, the port is considered to be jabbering.
A jabbering port will automatically be partitioned from
the switch system in order to prevent it from impairing
the performance of the network. The partitioned port

will be re-activated as soon as the offending signal dis­continues.

Excessive Collision
In the event that there are more than 16 consecutive

collisions, the ACD821 12 will reset the counter to zero
and retransmit the packet. This implementation insures
there is no packet loss even under channel capture
situation. However, the ACD821 12 has an option to drop
the packet on excessive collisions. When this option is
enabled

(T able-7.24, bit-11)

, the frame will be dropped

after 16 consecutive collisions.
If a port has encountered 256 consecutive collisions, it

is assumed to be non-functional and will be partitioned.
The partitioned port will not receive any frame. It will still
transmit new frames, but without retry after encounter­ing a collision. The partition port will be released once a
new frame is transmitted without incurring a collision,
which indicates that, the port has regained normal func­tions.

False Carrier Events
If the signal in the MII interface is asserted but the re-

ceive data valid (RXDV) signal is not, and the RXD shows
1 1 10 at the same time, the port is considered to have a
false carrier event. If a port has more than two con­secutive false carrier events, the port will automatically
be partitioned from the switch system. The partitioned
port will be re-activated if it has been idling for 33,000
BT or it has received 500 bits of valid data after a mini­mum 64 BT idle period.

Frame Forwarding
If the first bit of the destination address is 0, the frame

is handled as a unicast frame. The destination address
is passed to the Address Resolution Logic; which re­turns a destination port number to identify which port
the frame should be forwarded to. If the Address Reso­lution Logic cannot find any match for the destination
address, the frame will be treated as a frame with un­known DA. The frame will be processed in one of two
ways. If the option flood-to-all-port is enabled, the switch
will forward the frame to all ports within the same VLAN
of the source port, except the source port itself. If the
option is not enabled, the frame will be forwarded to the
‘dumping port’ of the source port VLAN only . The dump­ing port is determined by the VLAN ID of the source
port. If the source port belongs to multiple VLANs, a
frame with unknown DA will then be forwarded to mul­tiple dumping ports of the VLANs.

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If the first bit of the destination address is a 1, the frame
is handled as a multicast or broadcast frame. The
ACD821 12 does not differentiate a multicast packet from
a broadcast packet except for the reserved bridge man­agement group address, as specified in Table 3.5 of
IEEE 802.1D standard. The destination ports of a broad­cast frame are all ports within the same VLAN except
the source port itself.

The order of all broadcast frames with respect to the
unicast frames is strictly enforced by the ACD821 12.

Frame Transmission
The ACD82112 transmits all frames in accordance to

IEEE 802.3 standard. The ACD82112 will send the
frames with a guaranteed minimum interframe gap of
96 BT, even if the received frames have an IFG less
than the minimum requirement. Before the transmit pro­cess is started, the MAC logic will check if the channel
has been silent for more than 64 BT. Within the 64 BT
silent window, the transmission process will defer on
any receiving process. If the channel has been silent
for more than 64 BT , the MAC will wait an additional 32
BT before starting the transmit process. In the event
that the carrier sense signal is asserted by the MII dur­ing the wait period, the MAC logic will generate a JAM
signal to cause a forced collision.

The MAC logic will abort the transmit process if a colli­sion is detected through the assertion of the Col signal
of the MII. Re-transmission of the frame is scheduled in
accordance to the IEEE 802.3’s truncated binary expo­nential backoff algorithm. If the transmit process has
encountered 16 consecutive collisions, an excessive
collision error is reported, and the ACD821 12 will try to
re-transmit the frame, unless the drop-on-excessive­collision option of the port is enabled. It will first reset
the number of collisions to zero and then start the trans­mission after a 96 bit time of inter frame gap. If drop­on-excessive-collision is enabled, the ACD821 12 will not
try to re-transmit the frame after 16 consecutive colli­sions. If collision is detected after 512 BT of the trans­mission, a late collision error will be reported, but the
frame will still be retransmitted after proper backoff time.

Frame Generation
During a transmit process, frame data is read out from

the memory buffer and is forwarded to the destination
port’s PHY device in nibbles. 7 bytes of a preamble
signal (10101010) will be generated first followed by the
SFD (1010101 1), and then the frame data and 4 bytes
of FCS are sent out at last.

Shared Buffer
All ports of the ACD82112 work in Store-And-Forward

mode so that all ports can support both 10Mbps and
100Mbps data speeds. The ACD821 12 utilizes a global
memory buffer pool, which is shared by all ports. The
device has a unique architecture that inherits the ad­vantage of both output buffer-based and input buffer­based switches. The output buffer-based switches store
the received data only once into the memory , and hence
has a short latency. Whereas input buffer based
switches typically have more efficient flow control.

Starvation Control Scheme
All frames received by the ACD821 12 will be stored

into a common physical frame buffer pool. In order to
make sure all ports have fair access to the network, a
buffer allocation scheme (starvation control) is used to
prevent active ports from occupying all the buffers and
starve off the less active ports.

The frame buffer pool is divided into 3 portions: the

reserved poo

l, the

common pool

and the

extra pool

,

as shown in

Figure-5.1:

Extra Pool

(shared by all full duplex ports

with flow control capability)

Reserved Pool

(dedicated to each port)

Common Pool

(shared by all the ports)

~50%

~80%

Figure-5.1: Buffer Partition

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INTRODUCTORY

The

reserved pool

guarantees each port will have a
fair network access possibility , even under the worst
traffic congestion situation. It takes about 50% of the
total buffer and is evenly allocated to each port as its
dedicated buffer slot. The dedicated slot is not shared
with other ports.

The

common pool

provides a deep buffer for the busy
ports (e.g. server port) to serve multiple low speed
ports (e.g. client port) simultaneously . It helps to avoid
head-of-line blocking. It takes about 30% of the total
buffer and is shared by all ports. It stores the con­gested traffics before the flow control mechanism is
triggered.

The

extra pool

is reserved only for ports with pause
frame based flow control capacity . It takes the remain­ing 20% of the total buffer. It is used to minimize the
chance of frame dropping by buffering for the latency
of the pause frame based flow control scheme. It is
used only after a flow control mechanism is triggered.

Flow Control Scheme
Flow control activity is triggered when the buffer

utilization exceeds certain thresholds specified by the
dedicated registers.

Register-10

is used to specify the
Upper and the Lower Thresholds of the reserved
buffer slot for each port.

Register-11

is used to
specify the Upper and the Lower thresholds of the
broadcast queue.

Under full duplex operation, if the buffer utilization of a
port has exceeded the upper threshold of the reserved
buffer slot, and the common pool has been used up,

a

max-pause-frame

( a pause frame with a maximum
time interval of FFFFh) will be sent to the sending
party to stop it from sending new frames. If pause­frame based flow control is not enabled at that port,
the frame will be dropped. Once a

max-pause-frame

is sent, if the utilization of the reserved buffer slot of
the port drops below the lower threshold, a

mini-

pause-frame

(a pause frame with minimum time
interval of 0) will be sent to the linking party to enable
new frame transmission.

Under half duplex operation, if the buffer utilization of
a port has exceeded the upper threshold of the
reserved buffer slot, and the common pool has been
used up, the port will execute back-pressure based
flow control by sending a jam pattern on each incom­ing frame. If backpressure flow control of the port is
not enabled, the frame will be dropped.

If the broadcast flow control is enabled (when bit-13 of
register-25 is set), flow control will be triggered when

the broadcast queue is longer than the upper thresh­old specified by

Register-1 1

. All full duplex ports with

pause-frame capability will send a

max-pause-frame

to its linking party . All half-duplex ports with
backpressure capability will jam incoming frames.
After a max-pause-frame is sent, and if the broadcast
queue is shorten below the lower threshold specified
by

Register-1 1

, a mini-pause-frame will be sent to

release the hold on transmission.

VLAN Support

(Registers 23 & 24)

The ACD821 12 can support up to 4 port-based security
VLANs. Each port of the ACD821 12 can be assigned to
up to four VLAN. On power up, every port is assigned
to VLAN-I as the default VLAN. Frames from the source
port will only be forwarded to destination ports within
the same VLAN domain. A broadcast/multicast frame
will be forwarded to all ports within the VLAN(s) of the
source port. A unicast frame will be forwarded to the
destination port only if the destination port is in the same
VLAN as the source port. Otherwise, the frame will be
treated as a frame with unknown DA. Each VLAN can
be assigned with a dedicated dumping port. Multiple
VLANs can also share a dumping port. Unicast frames
with unknown destination addresses will be forwarded
to the dumping port of the source port VLAN.

Security VLAN can be disabled by setting the corre­sponding bit in the system configuration register (bit 8
of

Register 16, see Table 7.15

). When security VLAN
is disabled, each VLAN becomes a Leaky VLAN and is
equivalent to a broadcast domain. Four dumping ports
of four different Leaky VLANs can be grouped together
to form a fat pipe uplink (for example, port 0, port 1,
port 2, and port 3 can be grouped to form an 800 Mbps
uplink port). When multiple dumping ports are grouped
as a single pipe, each port has to be assigned to one
and only one VLAN. A unicast frame with a matched
DA will be forwarded to any destination port, even if the
VLAN ID is different. All unmatched DA packets will be
forwarded to the designated dumping port of the source
port VLAN. The broadcast and multicast packets will
only be forwarded to the ports in the same VLAN of the
source port. Therefore, a 200 to 800 Mbit/s pipe can be
established by carefully grouping the dumping ports,
and directly connecting with any segmentation switches.

Dumping Port
Each VLAN can be assigned with a dedicated dumping

port. Multiple VLANs can share a dumping port. Each
dumping port can be used for an up-link connection or
for a DTE connection. That is, the dumping port can be
used to connect the switch with a computer repeater

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hub, a workgroup switch, a router, or any type of inter­connection device compliant with IEEE 802.3 standard.
ACD821 12 will direct the following frames to the dump­ing port:

• A frame with a unicast destination address that does
not match with any port’s source address within the
VLAN of the source port.

• A frame with a broadcast/multicast destination ad­dress*.

*See

Spanning T ree Support

If the device is configured to work under Flood-to-All­Port mode

(Register 25, bit 8)

, the frames with un­known DA will be forwarded to all the ports in the VLAN(s)
of the source port except the source port itself.

Mode of Operation

(Register 18)

All ports of the ACD821 12 can work in half duplex mode
or full duplex mode. If auto-negotiation is enabled, the
mode is determined by the PHY device. Otherwise, the
mode is assigned by the Full Duplex mode indication/
assignment register.

Spanning Tree Support
The ACD82112 supports the Spanning Tree protocol.

When Spanning Tree Support is enabled

(Register-16

bit 1, see Table 7.15)

, frames from the CPU port (port

11) having a DA value equal to the reserved Bridge
Management Group Address for BPDU will be forwarded
to the port specified by the CPU. Frames from all other
ports with a DA value equal to the Reserved Group Ad­dress for BPDU will be forwarded to the CPU port if the
port is in the same VLAN of the CPU port. Port 11 is
designed as the default CPU port. When Spanning Tree
Support is disabled, all reserved group addresses for
Bridge Management is treated as broadcast address,
with the exception of the reserved multicast addresses
for pause frame specified by IEEE802.3x.

Every port of the ACD82112 can be set to block-and­listen mode through the CPU interface. In this mode,
incoming frames with a DA value equal to the reserved
Group Address for BPDU will be forwarded to the CPU
port. Incoming frames with all other DA values will be
dropped. Outgoing frames with a DA value equal to the
Group Address for BPDU will be forwarded to the at­tached PHY device; all other outgoing frames will be
filtered.

Queue Management
Each port of the ACD821 12 has its own individual trans-

mission queue. All frames coming into the ACD82112
are stored into the shared memory buffer , and are lined
up in the transmission queues of the corresponding
destination port. The order of all frames, unicast or
broadcast, is strictly enforced by the ACD82112. The
ACD82112 is designed with a non-blocking switching
architecture. It is capable of achieving wire speed for­warding rates and can handle maximum traffic loads.

MII Interface
The MAC of each port of the ACD821 12 interfaces with

the port’s PHY device through the standard MII inter­face. For reception, the received data (RXD) is sampled
by the rising edge of the receive clock (RXCLK). As­sertion of the receive data valid (RXDV) signal will cause
the MAC to look for the start of SFD. For transmission,
the transmit data enable (TXEN) signal is asserted when
the first preamble nibble is sent on the transmit data
(TXD) lines. The transmit data are clocked out by the
falling edge of the transmit clock (TXCLK).

PHY Management
The ACD82112 supports PHY device management

through the serial MDIO and MDC signal lines. The
ACD821 12 can continuously poll the status of the PHY
devices through the serial management interface, with­out CPU intervention. The ACD82112 will also config­ure the PHY capability field to ensure proper operation
of the link. The ACD82112 also enables the CPU to
access any registers in the PHY devices through the
CPU interface. The ID of the PHY device can start from
either “1” or “4”, depending on the setting of bit-10 of
register-25.

Reversed MII Interface
Five of the ACD82112’s 12 ports can be configured

with reversed MII interface. Reversed MII behaves as a
PHY MII: the TXCLK, COL, RXD<3:0>, RXCLK, RXDV ,
CRS signals (names specified by IEEE 802.3u) be­come output signals of the ACD821 12, and the TXER,
TXD<3:0>, TXEN, RXER signals (names specified by
IEEE 802.3u) become input signals of the ACD821 12.
The Reversed MII interface enables an external MAC
device to be connected directly with the ACD821 12.

10

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Data Sheet: ACD8211 2

INTRODUCTORY

SRAM Interface
The ACD82112 requires the use of ASRAM, or Flow-

through SSRAM as a memory buffer. Each read or write
cycle takes up to 20 ns. For ASRAM, the access time
should be at or less than 12 ns. For SSRAM, the speed
should be at or higher than 100MHz. The SRAM inter­face contains a 52-bit data bus, a 17-bit address bus
and 4 chip-select signals.

CPU Interface
The ACD82112 does not require any microprocessor

for operation. Initialization and most configurations can
be done with the pull-up or pull-down of designated hard­ware pins. A CPU interface is provided for a micropro­cessor to access the control registers and status regis­ters. The microprocessor can send a read command to
retrieve the status of the switch, or send a write com­mand to configure the switch through the interface. The
interface is a commonly used UART type interface. The
CPU interface can also be used to access the registers
inside each PHY device connected with the ACD821 12.

ARL Interface
The ACD821 12 has a built-in MAC address storage for

up to 2,048 source addresses. If more than 2,048 ad­dresses are needed, an external ARL (e.g. ACD80800)
can be used to expand the address space to 11K en­tries.

The external ARL is connected through the ARL inter­face

(Table-7.24, bit-9)

. It can tap the value of DA out
of the memory interface bus, and execute a lookup pro­cess to map the value of the DA into a port number. It
can also learn the SA values embedded in the received
frames. The value of SA is used to build the address
lookup table inside the ACD80800.

MIB Interface
Traffic activities on all ports of the ACD82112 can be

monitored through the MIB interface. Through the MIB
interface, a MIB device can view the frames transmitted
from or received by any port. Therefore, the MIB de­vice can maintain a record of traffic statistics for each
port to support network management. Since all received
data are stored into the memory buffer , and all transmit­ted data are retrieved from the memory buffer , the data
of the activities can also be captured from the memory
interface data bus. The status of each data transaction
between the ACD821 12 and the SRAM is displayed by
dedicated status signal pins of the ACD821 12.

LED Interface
The ACD82112 provides a wide variety of LED indica-

tors for simple system management. The update of the
LED is completely autonomous and merely requires low
speed TTL or CMOS devices as LED drivers. The sta­tus display is designed to be flexible to allow the system
designer to choose those indicators appropriate for the
specification of the equipment.

There are two LED control signals, LEDVLD0 and
LEDVLD1. They are used to indicate the start and end
of the LED data signal presented on nLED0-nLED3.
The LEDCLK signal is a 2.5MHz clock signal. The ris­ing edge of LEDCLK should be used to latch the LED
data signal into the LED driver circuitry .

The LED data signals contain Lnk, Xmt, Rcv, Col, Err,
Fdx and Spd, which represent Link status, Transmit sta­tus, Receive status, Collision indication, Frame error
indication, Full duplex operation and Operational Speed
status respectively. These status signals are sent out
sequentially from port 11 to port 0, once every 50ms.
For details about the timing diagrams of the LED sig­nals, refer to the chapter of “Timing Description ”

Life Pulse
The ACD82112 continuously sends out life pulses to

the WCHDOG pin when it is operating properly. In a
catastrophic event, the ACD821 12 will not send the life
pulse to cause the external watchdog circuitry to time­out and reset the switch system.

11

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Data Sheet: ACD8211 2

INTRODUCTORY

6. INTERFACE DESCRIPTION

MII Interface (MII)
The ACD82112 communicates with the external 10/100

Ethernet transceivers through standard MII interface.
The signals of MII interface are described in

T able-6.1

:

For MII interface, signal PxRXDV , PxRXER and PxRXD0
through PxRXD3 are sampled by the rising edge of
PxRXCLK. Signal PxTXEN, and PxTXD0 through
PxTXD3 are clocked out by the falling edge of PxTXCLK.
The detailed timing requirement is described in the chap­ter of “Timing Description”

Ports 0, 1, 2, 3 and 11 can be configured as reversed
MII ports (

Register 28

, the Reversed MII Enable regis­ter). These ports, when configured as “normal” MII, have
the same characteristics as all other MII ports. How­ever, when configured as reversed MII interface, they
will behave logically like a PHY device, and can inter­face directly with a MAC device. The signal of reversed
MII interface are described by

Table-6.2

:

*Collision Indication for half-duplex, Receive-Not-Ready for full
duplex only.

For reversed MII interface, signal PxRXDVR, and
PxRXD0R through PxRXD3R are clocked out by the
falling edge of PxRXCLKR. Signal PxTXENR, and
PxTXD0R through PxTXD3R can be sampled by the
falling edge or rising edge of PxTXCLKR, depends on
the setting of bit 9 of

Register-16

. The timing behavior

is described in the chapter of “Timing Description.“

PHY Management Interface
All control and status registers of the PHY devices are

accessible through the PHY management interface. The
interface consists of two signals: MDC and MDIO, which
are described in

table-6.3

.

Frames transmitted on MDIO has the following format
(

Table-6.4

):

Table-6. 1: MII Inter face Signals

Name Type De scription

PxCRS I Carrier sense

PxRXDV I Receive data valid
PxRXCLK I Receive clock (25/2.5 MH z)
PxRXERR I Receive erro r

PxRXD0 I Receive data bit 0

PxRXD1 I Receive data bit 1

PxRXD2 I Receive data bit 2

PxRXD3 I Receive data bit 3

PxCOL I Collision indication

PxTXEN O Transmit data valid

PxTXCLK I Transmit clock (25/2.5 MHz)

PxTXD0 O Transmit data bit 0
PxTXD1 O Transmit data bit 1
PxTXD2 O Transmit data bit 2
PxTXD3 O Transmit data bit 3

Table-6. 2: Reversed MII Inter face Signals

Name Type Description

PxCRSR O Carrier sense

PxRXDVR I Transmit data valid

PxRXCLKR O Transmit clock (25/2.5 MHz)

PxRXERR I Transmit-Not-Ready
PxRXD0R I Transmit data bit 0
PxRXD1R I Transmit data bit 1
PxRXD2R I Transmit data bit 2
PxRXD3R I Transmit data bit 3

PxCOLR* O

Collision Indication/

Receive-Not-Ready*

PxTXENR O Receive data valid

PxTXCLKR O Receive clock (25/2.5 MHz)

PxTXD0R O Receive data bit 0
PxTXD1R O Receive data bit 1
PxTXD2R O Receive data bit 2
PxTXD3R O Receive data bit 3

Table-6. 3: PHY Management Inter face Signals

Name Type De scription

M DC O PHY management clock (1.25MH z)

M DI O I /O PHY management data

Table-6. 4: MDIO Format

Operation PRE ST OP PHY-ID REG-AD TA DATA IDLE

W r it e 1…1 01 01 aaaaa rrrrr 10 d…d Z
Read 1…1 01 10 aaaaa rrrrr Z0 d…d Z

Prior to any transaction, the ACD821 12 will output thirty­two bits of ‘1’ as preamble signal. After the preamble, a
01 signal is used to indicate the start of the frame.

For a write operation, the device will send a ‘01’ to sig­nal a write operation. Following the ‘01’ write signal will
be the 5 bit ID address of the PHY device and the 5 bit
register address. A ‘10’ turn around signal is then fol­lowed. After the turn around, the 16 bit of data will be
written into the register. After the completion of the write
transaction, the line will be left in a high impedance
state.

For a read operation, the ACD821 12 will output a ‘10’ to
indicate read operation after the start of frame indica­tor. Following the ‘10’ read signal will be the 5-bit ID
address of the PHY device and the 5-bit register ad­dress. Then, the ACD821 12 will cease driving the MDIO
line, and wait for one bit time. During this time, the
MDIO should be in a high impedance state. The
ACD821 12 will then synchronize with the next bit of ‘0”
driven by the PHY device, and continue on to read 16
bits of data from the PHY device.

The system designer can set the ID of the PHY devices
as 1 for port 0, 2 for port 1, … and 12 for port 1 1, when
the PHYID option (Bit-10 of Register-25) is set to “0”. If
the PHYID option is set to “1”, the corresponding PHY
ID should set to 4 through 15. The detailed timing re­quirements on PHY management signals are described
in the chapter of “Timing Description.”

CPU Interface
The ACD821 12 includes a CPU interface to enable an

external CPU to access the internal registers of the
ACD82112. The signal used in the CPU is UART. The
baud rate can be from 1200 bps to 76800 bps. The
ACD821 12 automatically detects the baud rate for each
command, and returns the result at the same baud rate.
The signals in CPU interface are described in

Table-

6.5

.

A command sent by CPU comes through the CPUDI
line. The command consists of 8 octets. Command
frames transmitted on CPUDI have the following format
(

Table-6.6

):

The byte order of data in all fields follows the big-endian
convention, i.e. most significant octet first. The bit or­der is the least significant order first. The Command
octet specifies the type of the operation. Bit 2 and bit 3
of the command octet is used to specify the device ID
of the chip. They are set by bit 16 and bit 17 of the

Register 25

at power on strobing. The address octet
specifies the type of the register. The index octet speci­fies the index of the register in a register array. For
write operation, the Data field is a 3-octet value to specify
what to write into the register. For read operation, the
Data field is a 3-octet 0 as padded data. The checksum
value is an 8-bit value of exclusive-OR of all octets in the
frame, starting from the Command octet.

For each valid command heading to it, the ACD82112
will always send a response. Response from the
ACD821 12 is sent through the CPUDO line. Response
frames sent by the ACD821 12 has the following format
(

Table-6.7

):

The command octet specifies the type of the response.
The result octet specifies the result of the execution.

The Result field in a response frame is defined as:

• 00 for no error

• 01 for Checksum

• 10 for address incorrect

• 1 1 for MDIO waiting timeout

For response to a read operation, the Data field is a 4­octet value to indicate the content of the register. For
response to a write operation, the Data field is 32 bits of

0. The checksum value is an 8-bit value of exclusive-OR
of all octets in the response frame, starting from the
Command octet.

Table-6. 5: CPU Interface Signals

Name T ype Description

CPUDI I CPU data input
CPUDO O CPU data output
CPUIRQ O CPU interrupt request

Table-6. 6: CPUDI Format

Ope r ation Command Address Index D ata Che cksum

W r it e 0010XX11 8-bit 8-bit 24-bit 8-bit
Read 0010XX01 8-bit 8-bit 24-bit 8-bit

Table-6. 7: Switch Response Format

Re sponse Command Re sult Data Che cksum

W r it e 00100011 8-bit 24-bit 8-bit
Read 00100001 8-bit 24-bit 8-bit

12

13

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Data Sheet: ACD8211 2

INTRODUCTORY

CPUIRQ is used to notify the CPU that some special
status has been encountered by the ACD82112, like
port partition, fatal system error, etc. By clearing the
appropriate bit in the interrupt mask register, one can
stop the specific source from generating an interrupt
request. Reading the interrupt source register retrieves
the source of the interrupt request and clears the inter­rupt source register.

SRAM Interface
All received frames are stored into the shared memory

buffer through the SRAM interface. When the destina­tion port is ready to transmit the frame, data is read
from the shared memory buffer through the SRAM in­terface. The signals in SRAM interface are described
in

Table-6.8

.

Data is written into the SRAM or read from the SRAM in
52-bit wide words. The data is a 48 bit wide value and
the control is a 4 bit wide value. ADDR specifies the
address of the word, and DA T A contains the content of
the word. Bit 0 ~ 47 of DA TA bus are used to pass 48­bit frame data. Bit 48 are used to indicate the start and
end of a frame. Bit 49~51 are used to indicate the length
of the data shown on first 48 bit of DA TA bus.

nOE and nWE are used to control the timing of read or
write operation respectively. nCSx selects the SRAM
chip corresponding to the word address. The timing
requirement on SRAM access is described in “Timing
Description” (Chapter-9).

ARL Interface
The ARL interface provides a communication path be-

tween the ACD82112 and an ARL device, which can
provide up to 1 1K of address lookup. As the ACD821 12
receives a frame, the destination address and source
address of the frame are displayed on the ARLDO data
lines for the external ARL device. After the external ARL
finds the corresponding destination port, it returns the
result through the ARLDIx lines to the ACD821 12. The
timing requirement on ARL signals is described in Chap­ter 9, “Timing Description.”

Table-6.9

shows the asso-

ciated signals in ARL interface.
The data signal is tapped from the DATA bus of the

SRAM interface. Since all data of the received frames
will be written into the shared memory through the DA TA
bus, the bus can be used to monitor occurrences of DA
and SA values, indicated by the status signal of ARLST AT .
Therefore, ARLD0 through ARLD51 are the same sig­nals of DA T A0 through DA TA51.

The ARLDIR1 and ARLDIR0 are used to indicate the
direction of data on the ARLDO bus:

• 00: Idle

• 01: For receiving data

• 10: For transmitting data

• 1 1: Header

The ARLSYNC is used to indicate port 0 is driving the
DATA bus. Since the bus is pre-allocated in time divi­sion multiplexing manner, the ARL device can deter­mine which port is driving the DA TA bus.

The ARLSTAT are used to indicate the status of the
data shown on the first 48 bit of DATA bus. The 4-bit
status is defined as:

• 0000 - Idle

• 0001 - First word (DA)

• 0010 - Second word (SA)

• 001 1 - Third through last word

• 0100 - Filter Event

• 0101 - Drop Event

• 0110 - Jabber

• 01 11 - False Carrier/Deferred T ransmission*

• 1000 - Alignment error/Single Collision*

• 1001 - Flow Control/Multiple Collision*

• 1010 - Short Event/Excessive Collision

*

• 101 1 - Runt/Late Collision

*

• 1100 - Symbol Error

• 1101 - FCS Error

Table-6. 8: SRAM Interface

Name Type Description

DATA0 - DATA51 I/O memory data bus

A DDR0 - ADDR16 O memory address bus

nOE O output enable, low active

nWE O write enable, low active

nCS0 - nCS3 O chip select signals, low active.

Table-6. 9: ARL Interface Signals

Name Type De scription

ARLDO0-RLDO51 O ARL data output, shared with

DATA 0 - DATA 51

ARLDIR1-ARLDIR0 O ARL data direction indicator

00 for idle
01 for receive
10 for transmit
11 for control

ARLSYNC O ARL port synchronization

ARLSTAT0-

ARLSTAT3

O ARL data state indicator

ARLCLK O ARL clock

ARLDI0 - ARLDI3 I ARL data input

ARLDIV I ARL input data valid

14

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Data Sheet: ACD8211 2

INTRODUCTORY

• 1 1 10 - Long Event

• 1111 - Reserved

*

Note: error type depends on the port is receiving or

transmitting.

ARLDIx is used to receive the lookup result from the
external ARL. The result is returned by external ARL
device through the ARLDIx lines. Returned data can be
sampled by the rising or the falling edges of ARLCLK,
depending on the setting of Bit-18 of Register-25. The
ARL results have the following format:

Where

• SID is a 5-bit ID of the source port (0 - 11)

• RSL T is a 2-bit result, defined as:

00 - reserved
01 - matched
10 - not matched
11 - forced discard

• DID is a 5-bit ID of the destination port (0 - 11)
The start of each ARL result is indicated by assertion of

ARLDIV signal.

LED Interface
The signals in the LED interface is described in

Table-

6.10

:

The status of each port is displayed on the LED inter­face for every 50ms. LEDVLD0 and LEDVLD1 are used
to indicate the start and end of the LED data. LED data
is clocked out by the falling edge of LEDCLK, and should
be sampled by the rising edge of LEDCLK. LED data of
port-11 are clocked out first, followed by port-10 down
to port-0. All LED signals are low active.

SI D RSLT DID

Table-6. 10: LED Interface Signals

Name Type Description Signal Group 1 Signal Group 2

LEDVLD0 O LED signal valid #0 1 0
LEDVLD1 O LED signal valid #1 0 1
nLEDCLK O 2.5 MHz LED clock - -

nLED0 O Dual purpose indicator address learning status frame error indicator
nLED1 O Dual purpose indicator full duplex indication collision indication
nLED2 O Dual purpose indicator port speed (1=10M bps,0=100Mbps) receiving activity
nLED3 O Dual purpose indicator Link status transmit activity

15

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Data Sheet: ACD8211 2

INTRODUCTORY

Table-6. 12: Other Interface

Name Type D escription

CLK50 I 50 MHz clock input

nRESET I hardware reset

WCHDOG O watch dog life pulse signal

VDD - 3.3 V power

VSS - ground

Configuration Interface
The default values of certain register bits are set by

internal pull-high/pull-low with 75K Ohm resistors. These
default values can be overwritten by external pull-high/
pull-low of certain designated pins with 4.7K Ohm exter­nal resistors.

T able-6.11

lists all the available pins. The
meanings of the register bits are described in the chap­ter of “Register Description.”

Other Interface (

T able-6.12

)

The CLK50 should come from a clock oscillator, with

0.01% (100 ppm) accuracy.
The nRESET is a low-active hardware reset pin. Asser-

tion of this pin will cause the ACD82112 to go through
the power-up initialization process. All registers are set
to their default value after reset.

The WCHDOG pin is used to handle exceptional cases.
A normal working ACD821 12 sends out continuous life
pulses from the WCHDOG pin, which can be monitored
by an external watchdog circuit. If no life pulse is de­tected , the external watchdog circuit may force reset
of the switch system. It is a safeguard against unfore­seeable situations.

The VDD is 3.3V power supply .
The VSS is power ground.

Table-6. 11: Configurat ion Interface

Pin Name Register # Bit # Default

P7TXD0 0
P7TXD1 1

P7TXD2 2
P7TXD3 3
P6TXD0 4
P6TXD1 5
P6TXD2 6
P6TXD3 7

LEDCLK 8
LEDVLD0 9
LEDVLD1 10

nLED3 11
nLED2 12
nLED1 13

nLED0 14
P5TXD0 15
P5TXD1 16
P5TXD2 17
P5TXD3 18
P0TXD0 0
P0TXD1 1
P0TXD2 2
P0TXD3 3
P1TXD0 4
P1TXD1 5
P1TXD2 6
P1TXD3 7
P2TXD3 3 0
P2TXD2 1 1

20, inside the

Internal

ARL

See Table-7.25See Table-7.30

30

25

16

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Data Sheet: ACD8211 2

INTRODUCTORY

7. REGISTER DESCRIPTION

Registers in the ACD82112 are used to define the op­eration mode of various function modules of the switch
controller and the peripheral devices. Default values at
power-on are defined by the factory . The management
CPU (optional) can read the content of all registers and
modify some of the registers to change the operation
mode. T able-7.0 lists all the registers inside the switch
controller.

INTSRC register (register 1)
The INTSRC register indicates the source of the inter-

rupt request. Before the CPU starts to respond to an
interrupt request, it should read this register to find out
the interrupt source. This register is automatically cleared
after each read. Table-7.1 lists all the bits of this regis­ter.

SYSERR register (register 2)
The SYSERR register indicates the presence of sys-

tem errors. It is automatically cleared after each read.
T able-7.2 lists all kind of system error .

Table-7. 0: Register List

Address Name T ype Size Depth Description

0 Reserved R - - ­1 I NTSRC R 8 Bit 1 Inte rrupt Source
2 SYSERR R 12 Bit 1 System Error
3 PAR R 12 Bit 1 Port Partition Indication
4 PMERR R 12 Bit 1 PHY Management Error
5 ACT R 12 Bit 1 Port Avtivity
6 Reserved R - - ­7 Reserved R - - ­8 SAL R/W 24 Bit 1 Source Address, bit 23:0

9 SAH R/W 24 Bit 1 Source Address, bit 47:24
10 UTH R/W 16 Bit 1 Unicast Threshold
11 BTH R/W 16 Bit 1 Broadcast Threshold
12 MAXL R/W 16 Bit 1 FCS of Max-Pause-Frame, bit 15:0
13 MAXH R/W 16 Bit 1 FCS of Max-Pause-Frame, bit 31:16
14 MINL R/W 16 Bit 1 FCS of Min-Pause-Frame, bit 15:0
15 MINH R/W 16 Bit 1 FCS of M in-Pause-Frame, bit 31:16
16 SYSCFG R/W 16 Bit 1 System Configuration
17 INTMSK R/W 8 Bit 1 Int errupt Mask
18 SPEED R/W 12 Bit 1 Port Speed
19 LINK R/W 12 Bit 1 Port Link
20 nFWD R/W 12 Bit 1 Port Forward Disable
21 nBP R/W 12 Bit 1 Port Back Pressure Disable
22 nPORT R/W 12 Bit 1 Port Disable
23 PVID R/W 4 Bit 12 Port VLAN ID
24 VPID R/W 5 Bit 4 VLAN Dumping Port
25 POSCFG R/W 20 Bit 1 Power-On-Strobe Configuration
26 PAUSE R/W 12 Bit 1 Port Pause Frame Disable
27 DPLX R/W 12 Bit 1 Port Duplex Mode
28 RVSMII R/W 5 Bit 1 Reversed MI I Selectio n
29 nPM R/W 12 Bit 1 Port PHY Management Disable
30 ERRMSK R/W 8 Bit 1 Error Mask
31 CLKADJ R/W 4 Bit 1 ARL Clock Delay Adjustment

32-43 PHYREG R/W 16 Bit * Pointer to Registers in PHY devices
44-63 Reserved R/W - - -

Table-7. 1: INTSRC Register

Bit De script ion Default

0 System initialization completed
1 Sy stem erro r occurred
2 Port partition occurred
3 ARL Interrupt
4
5
6
7

Reserved

0

17

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Data Sheet: ACD8211 2

INTRODUCTORY

PAR register (register 3)
The PAR register indicates the presence of the parti-

tioned ports and the port ID. A port can be automati­cally partitioned if there is a consecutive false carrier
event, an excessive collision or a jabber. This register is
automatically cleared after each read. T able-7.3 lists all
the bits of this register.

Table-7.2: SYSERR Regist er

Bit Description De fault

0 BIST failure indication
1
2
3
4
5
6
7
8

0

Reserved

Table-7.3: PAR Register

Bit Description Default

0 0 - Port 0 is not partitioned.

1 - Port 0 is partitioned.

1 0 - Port 1 is not partitioned.

1 - Port 1 is partitioned.

2 0 - Port 2 is not partitioned.

1 - Port 2 is partitioned.

3 0 - Port 3 is not partitioned.

1 - Port 3 is partitioned.

4 0 - Port 4 is not partitioned.

1 - Port 4 is partitioned.

5 0 - Port 5 is not partitioned.

1 - Port 5 is partitioned.

6 0 - Port 6 is not partitioned.

1 - Port 6 is partitioned.

7 0 - Port 7 is not partitioned.

1 - Port 7 is partitioned.

8 0 - Port 8 is not partitioned.

1 - Port 8 is partitioned.

9 0 - Port 9 is not partitioned.

1 - Port 9 is partitioned.

10 0 - Port 10 is not partitioned.

1 - Port 10 is partitioned.

11 0 - Port 11 is not partitioned.

1 - Port 11 is partitioned.

0

PMERR register (register 4)
The PMERR register indicates the presence of PHYs

that have failed to respond to the PHY Management
command issued through the MDIO line. This register
is automatically cleared after each read. Table-7.4 de­scribes all the bit of this register.

ACT register (register 5)
The ACT register indicates the presence of transmit or

receive activities of each port since the register was
last read. This register is automatically cleared after
each read. T able-7.5 describes all the bits of this regis­ter.

Table-7. 4: PMERR Register

Bit De script ion Default

0 0 - Port 0's PHY responded

1 - Port 0’s PHY failed to respond

1 0 - Port 1’s PHY responded

1 - Port 1’s PHY failed to respond

2 0 - Port 2’s PHY responded

1 - Port 2’s PHY failed to respond

3 0 - Port 3’s PHY responded

1 - Port 3’s PHY failed to respond

4 0 - Port 4’s PHY responded

1 - Port 4’s PHY failed to respond

5 0 - Port 5’s PHY responded

1 - Port 5’s PHY failed to respond

6 0 - Port 6’s PHY responded

1 - Port 6’s PHY failed to respond

7 0 - Port 7’s PHY responded

1 - Port 7’s PHY failed to respond

8 0 - Port 8’s PHY responded

1 - Port 8’s PHY failed to respond

9 0 - Port 9’s PHY responded

1 - Port 9’s PHY failed to respond

10 0 - Port 10’s PHY responded

1 - Port 10’s PHY failed to respond

11 0 - Port 11’s PHY responded

1 - Port 11’s PHY failed to respond

0

18

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Data Sheet: ACD8211 2

INTRODUCTORY

SAL & SAH register (register 8,9)
The SAL and SAH registers together contain the com-

plete Source Address for pause frame generation. SAL
contains the least significant 24 bit of the MAC address.
SAH contains the most significant 24 bit of the MAC
address. The default locally managed source address
for pause frame generation is FEh-FFh-FFh-FFh-FFh­FFh a. Table-7.8 and table-7.9 describes all the bits of
these two registers.

UTH register (register 10)
The UTH register contains the unicast buffer thresholds

for each port. When the upper threshold is exceeded,
the MAC may generate a max-pause-frame. When the

lower threshold is crossed, the MAC may generate a
mini-pause-frame. T able-7.10 describes each bit in this
register.

*

Note: The default value is related to the memory size

specified by bit[6:5] of register 25.

BTH register (register 11)
The BTH register contains the broadcast queue buffer

threshold for each port. When the upper threshold is
exceeded, the MAC may generate a max-pause-frame.
When the lower threshold is crossed, the MAC may
generate a mini-pause-frame. T able-7.1 1 describes each
bit in this register.

MINL & MINH register (register 12,13)
The MINL and MINH registers together contain the 32-

bit Frame Check Sequence (FCS) of the mini-pause­frame. MINL contains the least significant 16 bit of the
FCS. MINH contains the most significant 16 bit of the
FCS. The default FCS value assumes the default source
address for the mini-pause-frame. T able-7.12 and table-

7.13 describe all the bits of these two registers.

Table-7. 8: SAL Register

Bit De script ion Default

7:0 Bit 47:40 of the switch’s MAC address. FEh

15:8 Bit 39:32 of the switch’s MAC address.

23:16 Bit 31:24 of the switch’s MAC address.

FFh

Table-7. 9: SAH Register

Bit De scription De f ault

7:0 Bit 23:16 of the switch’s MAC address.

15:8 Bit 15:8 of the switch’s MAC address.

23:16 Bit 7:0 of the switch’s MAC address.

FFh

Table-7. 10: UTH Register

Bit De scription Default*

7:0 Lower threshold of unicast utilization. 4,8,16,32

15:8 Higher threshold of unicast utilization. 8,24,64,144

Table-7. 5: ACT register

Bit De scription Default

0 0 - Port 0 no activity

1 - Port 0 has activity

1 0 - Port 1 no activity

1 - Port 1 has activity

2 0 - Port 2 no activity

1 - Port 2 has activity

3 0 - Port 3 no activity

1 - Port 3 has activity

4 0 - Port 4 no activity

1 - Port 4 has activity

5 0 - Port 5 no activity

1 - Port 5 has activity

6 0 - Port 6 no activity

1 - Port 6 has activity

7 0 - Port 7 no activity

1 - Port 7 has activity

8 0 - Port 8 no activity

1 - Port 8 has activity

9 0 - Port 9 no activity

1 - Port 9 has activity

10 0 - Port 10 no activity

1 - Port 10 has activity

11 0 - Port 11 no activity

1 - Port 11 has activity

0

Table-7. 11: BTH Register

Bit Description Default

7:0 Lower threshold of broadcast queue 16

15:8 Higher threshold of broadcast queue 48

Table-7.12: MINL Register

Bit Description Default

7:0 Bit 31:24 of the mini-pause-frame’s FCS 89

15:8 Bit 23:16 o f the mini -pa u se-frame’s FCS O3

Table-7 .13: MINH Register

Bit Description Default

7:0 Bit 15:18 of the mini-pause-frame’s FCS D7

15:8 Bit 7:0 of the mini-pause-frame’s FCS A9

19

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

MAXL & MAXH register (register 14,15)
The MAXL and MAXH registers together contain the

32-bit Frame Check Sequence (FCS) of the max-pause­frame. MAXL contains the least significant 16 bit of the
FCS. MAXH contains the most significant 16 bit of the
FCS. The default FCS value assumes the default source
address for the max-pause-frame. T able-7.14 and table-

7.15 describe all the bits of these two registers.

SYSCFG register (register 16)
The SYSCFG register specifies certain system con-

figurations. The system options are described in the
chapter of “Function Description.” T able-7.16 describes
all the bit of this register.

INTMSK register (register 17)
The INTMSK register defines the valid interrupt sources

allowed to assert interrupt request pin. Table-7.17 lists
all the bits of this register.

Table-7. 17: INTMSK Register

Bit D escription Default

0

Enable "system initialization
completi o n " to i n te rrupt

1

Enable "internal system error"
to interrupt

2

Enable "port partition event"

to interrupt
3 Enable "Internal ARL" to interrupt
4 ARL Interupt Enable
5
6
7

1

Reserved

Table-7. 16: SYSCFG Register

Bit De scription De fault

0 0 - BIST enabled;

1 - BIST disabled.

1 0 - Spanning Tree support disabled;

1 - Spanning Tree support enabled

2 0 - rising edge of RXCLK to latch RXD for MII

1 - falling edge of RXCLK to latch RXD for MII
3 Reserved.
4 Reserved.
5 0 - wait for CPU.

1 - system ready to start

*This bit is used by the CPU when bit-15 of

register-25 is set as "0" (for system with

control CPU). Th e system will wait for CPU

to set this bit.

6 0 - PHY Management not completed

1 - PHY Management completed.

*This bit is used by the CPU when bit-15 of

register-25 is set as "0" (for system with a

control CPU). The MAC w ill not start until this

bit is set sy the CPU.

7 0 - Watchdog function enabled.

1 - Watchdog function disabled.
8 0 - Secure VLAN checking rule enforced.

1 - Leaky VLA N checking rule enforced.
9 0 - Rising edge of RXCLK to latch data.

1 - Falling edge of RXCLK to latch data.

*For Reversed MII port only.

10 0 - Lat e Back-Pre ssure scheme disab led

1 - Lat e Back-Pre ssure scheme enabled

*When enabled, the MAC will generate back-

pressure only after reading the first bit of DA

11

0 - special handling of broadcast frames

disabled

1 - special handling of broadcast frames

enabled

*When enabled, all broadcast frames from

non-CPU port are forwarded to the CPU port

only, and all broadcast frames from the CPU

port are forwarded to all other ports.

12

Software Reset: "1" to start a system reset to

innitialize all state machines.

13

Hardware Reset: "1" to stop the life pulse on

the watchdog pin, which in turn will trigger the

external watchdog circuitry to reset the whole

system.

14 Reserved
15 Reserved

0

Table-7 .14: MAXL Register

Bit Description De fault

7:0 Bit 31:24 of the max-pause-frame’s FCS 0D

15:8 Bit 23:16 of the max-pause-frame’s FCS 68

Table-7.15: MAXH Register

Bit Description Default

7:0 Bit 15:8 of the max-pause-frame’s FCS D8

15:8 Bit 7:0 of the max-pause-frame’s FCS D0

20

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Data Sheet: ACD8211 2

INTRODUCTORY

SPEED register (register 18)
The SPEED register specifies or indicates the speed

rate of each port. It is read-only, unless the bit-12 of
register-25 is set (through POS to disable automatic
PHY management). At read-only mode, it indicates the
speed achieved through PHY management. At the write­able mode, the control CPU will be able to assign speed
rate for each port. Table-7.18 describes all the bit of
this register.

LINK register (register 19)
The LINK register specifies or indicates the link status

of each port. It is read-only , unless bit-12 of register-25
is set (through POS, to disable automatic PHY man­agement). At read-only mode, it indicates the result
achieved by PHY management. At write-able mode, the
control CPU can assign link status for each port. T able-

7.19 describes all the bit of this register.

nFWD register (register 20)
The nFWD register defines the forwarding mode of each

port. Under

forwarding

mode, a port can forward all

frames. Under

block-and-listen

mode, a port will not

forward regular frames, except BPDU frames. If the

spanning tree algorithm discovers redundant links, the
control CPU will allow only one link remaining in

for-

warding

mode and force all other links into

block-and-

listen

mode. Setting the associated bit in this register

will put the port into

block-and-listen

mode. Table-7.20

Table-7.18: SPEED Register

Bit Descript ion Default

0 0 - Port 0 at 10Mbps

1 - Port 0 at 100Mbps

1 0 - Port 1 at 10Mbps

1 - Port 1 at 100Mbps

2 0 - Port 2 at 10Mbps

1 - Port 2 at 100Mbps

3 0 - Port 3 at 10Mbps

1 - Port 3 at 100Mbps

4 0 - Port 4 at 10Mbps

1 - Port 4 at 100Mbps

5 0 - Port 5 at 10Mbps

1 - Port 5 at 100Mbps

6 0 - Port 6 at 10Mbps

1 - Port 6 at 100Mbps

7 0 - Port 7 at 10Mbps

1 - Port 7 at 100Mbps

8 0 - Port 8 at 10Mbps

1 - Port 8 at 100Mbps

9 0 - Port 9 at 10Mbps

1 - Port 9 at 100Mbps

10 0 - Port 10 at 10Mbps

1 - Port 10 at 100Mbps

11 0 - Port 11 at 10Mbps

1 - Port 11 at 100Mbps

0

Table-7. 19: LINK Register

Bit Description De fault

0 0 - Port 0 link not established

1 - Port 0 link established

1 0 - Port 1 link not established

1 - Port 1 link established

2 0 - Port 2 link not established

1 - Port 2 link established

3 0 - Port 3 link not established

1 - Port 3 link established

4 0 - Port 4 link not established

1 - Port 4 link established

5 0 - Port 5 link not established

1 - Port 5 link established

6 0 - Port 6 link not established

1 - Port 6 link established

7 0 - Port 7 link not established

1 - Port 7 link established

8 0 - Port 8 link not established

1 - Port 8 link established

9 0 - Port 9 link not established

1 - Port 9 link established

10 0 - Port 10 link not established

1 - Port 10 link established

11 0 - Port 11 link not established

1 - Port 11 link established

0

Table-7. 20: nFW D R egist er

Bit Description Default

0 0 - Port 0 in forwarding state.

1 - Port 0 in block-and-listen state.

1 0 - Port 1 in forwarding state.

1 - Port 1 in block-and-listen state.

2 0 - Port 2 in forwarding state.

1 - Port 2 in block-and-listen state.

3 0 - Port 3 in forwarding state.

1 - Port 3 in block-and-listen state.

4 0 - Port 4 in forwarding state.

1 - Port 4 in block-and-listen state.

5 0 - Port 5 in forwarding state.

1 - Port 5 in block-and-listen state.

6 0 - Port 6 in forwarding state.

1 - Port 6 in block-and-listen state.

7 0 - Port 7 in forwarding state.

1 - Port 7 in block-and-listen state.

8 0 - Port 8 in forwarding state.

1 - Port 8 in block-and-listen state.

9 0 - Port 9 in forwarding state.

1 - Port 9 in block-and-listen state.

10 0 - Port 10 in forwarding state.

1 - Port 10 in block-and-listen state.

11 0 - Port 11 in forwarding state.

1 - Port 11 in block-and-listen state.

0

21

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Data Sheet: ACD8211 2

INTRODUCTORY

describes all the bit of this register.

nBP register (register 21)
The nBP register defines back-pressure flow control

capability for each port. T able-7.21 describes all the bit
of this register.

nPORT register (register 22)
The nPORT register is used to isolate ports from the

network. Setting the associated bit in this register will
stop a port from receiving or transmitting any frame.
T able-7.22 describes all the bits of this register.

PVID register (register 23)
The PVID registers assign VLAN IDs for each port.

There are 12 PVID registers, one for each port. A PVID
consists of 4 bits, each corresponding to one of the 4
VLANs. A port can belong to more than one VLAN at
the same time. Table-7.23 describes all the bits of this
register.

VPID register (register 24)
The VPID registers specify the dumping port for each

VLAN. There are 4 VPID 5-bit registers, one for each
VLAN. A valid VPID are “0” through “11” (other values
are reserved and should not used). T able-7.24 describes
all the bits of this register.

Table-7. 21: nBP Register

Bit Description Default

0 0 - Port 0 back-pressure scheme enabled

1 - Port 0 back pressure scheme disabled

1 0 - Port 1 back-pressure scheme enabled

1 - Port 1 back pressure scheme disabled

2 0 - Port 2 back-pressure scheme enabled

1 - Port 2 back pressure scheme disabled

3 0 - Port 3 back-pressure scheme enabled

1 - Port 3 back pressure scheme disabled

4 0 - Port 4 back-pressure scheme enabled

1 - Port 4 back pressure scheme disabled

5 0 - Port 5 back-pressure scheme enabled

1 - Port 5 back pressure scheme disabled

6 0 - Port 6 back-pressure scheme enabled

1 - Port 6 back pressure scheme disabled

7 0 - Port 7 back-pressure scheme enabled

1 - Port 7 back pressure scheme disabled

8 0 - Port 8 back-pressure scheme enabled

1 - Port 8 back pressure scheme disabled

9 0 - Port 9 back-pressure scheme enabled

1 - Port 9 back pressure scheme disabled

10 0 - Port 10 back-pressure scheme enabled

1 - Port 10 back pressure scheme disabled

11 0 - Port 11 back-pressure scheme enabled

1 - Port 11 back pressure scheme disabled

0

Table-7. 22: nPORT Register

Bit Description De f ault

0 0 - Port 0 enabled

1 - Port 0 disabled

1 0 - Port 1 enabled

1 - Port 1 disabled

2 0 - Port 2 enabled

1 - Port 2 disabled

3 0 - Port 3 enabled

1 - Port 3 disabled

4 0 - Port 4 enabled

1 - Port 4 disabled

5 0 - Port 5 enabled

1 - Port 5 disabled

6 0 - Port 6 enabled

1 - Port 6 disabled

7 0 - Port 7 enabled

1 - Port 7 disabled

8 0 - Port 8 enabled

1 - Port 8 disabled

9 0 - Port 9 enabled

1 - Port 9 disabled

10 0 - Port 10 enabled

1 - Port 10 disabled

11 0 - Port 11 enabled

1 - Port 11 disabled

0

Table-7. 23: PVID Register

Bit D escription D efault

0 0 - port not in VLAN-I. 1

1 - port in VLAN-I.

1 0 - port not in VLAN-II.

1 - port in VLAN-II.

2 0 - port not in VLAN-III.

1 - port in VLAN-III.

3 0 - port not in VLAN-IV.

1 - port in VLAN-IV.

0

Table-7. 24: VPID Registers

(4 registers)

Bit Description Default

4:0 Dumping port ID for VLAN -1 "00000"
4:0 Dumping port ID for VLAN -2 "11111"
4:0 Dumping port ID for VLAN -3 dumping port
4:0 Dumping port ID for VLAN -4 not defined

22

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

POSCFG register (register 25)
The POSCFG register specifies a certain configuration

setting for the switch system. The default values of this
register can be changed through pull-up/pull-down of
specific pins, as described in the “Configuration Inter­face” section of the “Interface Description” chapter.
T able-7.25 describes all the bit of this register.

Table-7.25: POSCFG Register

Bit Description Default

3:0 8 timing adjustment levels for SRAM Read data latching: 0000

0000 - no delay
0001 - level 1 delay
0011 - level 2 delay
0101 - level 3 delay
0111 - level 4 delay
1001 - level 5 delay
1011 - level 6 delay
1101 - level 7 delay
1111 - level 8 delay

4 0 - Absolute address mode: 1 row of 512K words, nCS2=ADDR1 7 , n CS 3=ADDR18 0

1 - Chip-Select address mode: 4 rows of 128K words, nCS[3:0] to select 4 rows of memory

6:5 SRAM size select ion: 01

00 - 64K words
01 - 128K words
10 - 256k words
11 - 512K words

7 0 - Long Event defined as frame longer than 1518 byte. 1

1 - Long Event defined as frame longer than 1530 byte.

8 0 - Frames with unknown DA forwarded to the dumping port. 1

1 - Frames with unknown DA forwarded to all ports.

9 0 - Internal ARL selected (2K MA C address entry). 0

1 - External ARL selected (11K MAC address entry).

10 0 - PHY I Ds start from 1, range from 1 to 12. 1

1 - PHY I Ds start from 4, range from 4 to 15.

11 0 - Re-transmit after excessive collision. 0

1 - Drop after excessive collision.

12 0 - Automatic PHY Management enabled 0

1 - Automatic PHY Management disabled: the control CPU need to update the SPEED, LI NK, DPLX and

nPAUSE registers
13 Reserved 0
14 0 - Sysem errors will trigger software reset 0

1 - Sysem errors will trigger hardware reset
15 0 - System start itself without a control CPU 0

1 - System start after system-ready bit in register-16 is set by the control CPU

17:16

2-bit device ID for UART communication. The device responses only to UART commands with

matching ID

00

18 0 - Rising edge of ARLCLK to latch A RLDI. 1

1 - Falling edge of ARLCLK to latch ARLDI.

23

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Data Sheet: ACD8211 2

INTRODUCTORY

PAUSE register (register 26)
The PAUSE register defines the pause-frame based

flow control capability of each port. T able-7.26 describes
all the bits of this register.

DPLX register (register 27)
The DPLX register specifies or indicates the half/full-

duplex mode of each port. It is read-only , unless bit-12
of register-25 is set (through POS, to disable automatic
PHY management). At read-only mode, it indicates the
result achieved by the PHY management. At write-able
mode, the control CPU can assign a half-duplex or full­duplex mode for each port. T able-7.27 describes all the
bits of this register.

RVSMII register (register 28)
The RVSMII register defines the

reversed MII

mode for
each port. T able-7.28 describes all the bits of this regis­ter.

Table-7. 26: PAUSE Register

Bit D escription D efault

0 0 - Port 0 Pause-Frame disabled

1 - Port 0 Pause-Frame enabled

1 0 - Port 1 Pause-Frame disabled

1 - Port 1 Pause-Frame enabled

2 0 - Port 2 Pause-Frame disabled

1 - Port 2 Pause-Frame enabled

3 0 - Port 3 Pause-Frame disabled

1 - Port 3 Pause-Frame enabled

4 0 - Port 4 Pause-Frame disabled

1 - Port 4 Pause-Frame enabled

5 0 - Port 5 Pause-Frame disabled

1 - Port 5 Pause-Frame enabled

6 0 - Port 6 Pause-Frame disabled

1 - Port 6 Pause-Frame enabled

7 0 - Port 7 Pause-Frame disabled

1 - Port 7 Pause-Frame enabled

8 0 - Port 8 Pause-Frame disabled

1 - Port 8 Pause-Frame enabled

9 0 - Port 9 Pause-Frame disabled

1 - Port 9 Pause-Frame enabled

10 0 - Port 10 Pause-Frame disabled

1 - Port 10 Pause-Frame enabled

11 0 - Port 11 Pause-Frame disabled

1 - Port 11 Pause-Frame enabled

1

Table-7. 27: DPLX Register

Bit Description Default

0 0 - Port 0 under half duplex mode

1 - Port 0 under full duplex mode

1 0 - Port 1 under half duplex mode

1 - Port 1 under full duplex mode

2 0 - Port 2 under half duplex mode

1 - Port 2 under full duplex mode

3 0 - Port 3 under half duplex mode

1 - Port 3 under full duplex mode

4 0 - Port 4 under half duplex mode

1 - Port 4 under full duplex mode

5 0 - Port 5 under half duplex mode

1 - Port 5 under full duplex mode

6 0 - Port 6 under half duplex mode

1 - Port 6 under full duplex mode

7 0 - Port 7 under half duplex mode

1 - Port 7 under full duplex mode

8 0 - Port 8 under half duplex mode

1 - Port 8 under full duplex mode

9 0 - Port 9 under half duplex mode

1 - Port 9 under full duplex mode

10 0 - Port 10 under half duplex mode

1 - Port 10 under full duplex mode

11 0 - Port 11 under half duplex mode

1 - Port 11 under full duplex mode

0

Table-7. 28: RVSMII register

Bit De scription De fault

0 0 - Port 0 under normal MII mode

1 - Port 0 under reversed MII mode

1 0 - Port 1 under normal MII mode

1 - Port 1 under reversed MII mode

2 0 - Port 2 under normal MII mode

1 - Port 2 under reversed MII mode

3 0 - Port 3 under normal MII mode

1 - Port 3 under reversed MII mode

4 0 - Port 11 under normal MII mode

1 - Port 11 under reversed MII mode

0

24

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

nPM register (register 29)
The nPM register indicates the automatic PHY man-

agement capability of each port. If a bit is set in this
register, the corresponding SPEED, LINK, DPLX, and
P AUSE status registers of a port will remain unchanged.
T able-7.29 describes all the bits of this register.

ERRMSK register (register 30)
The ERRMSK register defines certain errors as

sys-

tem errors

. It is reserved for factory use only. Table-

7.30 lists all the error masks specified by this register.

Table-7. 29: nPM Register

Bit De scription De fault

0 0 - Port 0’s status update enabled

1 - Port 0’s status update disabled

1 0 - Port 1’s status update enabled

1 - Port 1’s status update disabled

2 0 - Port 2’s status update enabled

1 - Port 2’s status update disabled

3 0 - Port 3’s status update enabled

1 - Port 3’s status update disabled

4 0 - Port 4’s status update enabled

1 - Port 4’s status update disabled

5 0 - Port 5’s status update enabled

1 - Port 5’s status update disabled

6 0 - Port 6’s status update enabled

1 - Port 6’s status update disabled

7 0 - Port 7’s status update enabled

1 - Port 7’s status update disabled

8 0 - Port 8’s status update enabled

1 - Port 8’s status update disabled

9 0 - Port 9’s status update enabled

1 - Port 9’s status update disabled

10 0 - Port 10’s status update enabled

1 - Port 10’s status update disabled

11 0 - Port 11’s status update enabled

1 - Port 11’s status update disabled

0

Table-7. 30: ERRMSK regist er

Bit Description De f ault

0
1
2
3
4
5
6
7

Reserved 1

CLKADJ register (register 31)
The CLKADJ register defines the delay time of the

ARLCLK relative to the transition edge of the data sig­nals. The ARLCLK provides reference timing for sup­porting chips, such as the ACD80800 and the
ACD80900, which need to snoop the data bus for cer­tain activities. Table-7.31 describes all the bits of this
register.

PHYREG register (register 32-44)
The PHYREG refers to the registers residing on the

PHY devices. The ACD82112 merely provides an ac­cess path for the control CPU to access the registers
on the PHYs. For detailed information about these reg­isters, please refer to the PHY data sheet.

Register-32 through Register-44 are assigned to PHY­0 through PHY-11 respectively. The contents of these
registers are the register IDs inside the corresponding
PHYs. For example, a “4” in Register-44 will point to the
Control Register-4 inside PHY-1 1.

Table-7. 31: CLKADJ Register

Bit De scription D efault

0 - ARLCLK not inverted
1 - ARLCLK inverted
ARLCLK delay levels:

000 - level 0 delay
001 - level 1 delay
010 - level 2 delay
011 - level 3 delay
100 - level 4 delay
101 - level 5 delay
110 - level 6 delay
111 - level 7 delay

000

00

3:1

25

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

8. PIN DESCRIPTIONS

Figure-8.1: Pin Diagram/Bottom View

AA

AB

AC

AD

AE

AF

2

4

6

8

10

12

14

16

18

20

22

24

26

1

3

5

7

9

11

13

15

17

19

21

23

25

ABCDEFGHJKLMNPRTUVWY

Table-8.1: Thermal Ground Pins

Pin Signal I/O Type

L[11:16]
M [11:16]
N[11:16]
P[11:16]
R[11:16]

T[11:16]

VSS Ground/Thermal

26

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

Table-8.2: Pin List By Locat ion

Pin Signal Name I/O Type Pin Signa l Nam e I/O Type Pin Si gna l Na m e I /O Type Pin Signa l Na m e I /O Type

A01 DATA51 3.3V I/O D11 ARLS YNC 3.3V O P01 DATA25 3.3V I/O AC17 VSS
A02 DATA50 3.3V I/O D12 VSS P02 DATA24 3.3V I/O AC18 P3T XENR 3.3V O
A03 STAT1 3.3V O D13 VSS P03 VDD AC19 P3RXD0R 3.3V I
A04 STAT3 3.3V O D14 P11RXD3R 3.3V I P04 VSS AC20 VSS
A05 ADDR9 3.3V O D15 VSS P23 P7TXD0 3.3V I/O AC21 P4TXD1 3.3V O
A06 ADDR8 3.3V O D16 P11RXD1R 3.3V I P24 P7TXD1 3.3V I/O AC22 P4RXCLK 3.3V I
A07 ADDR7 3.3V O D17 VSS P25 P7TXD2 3.3V I/O AC23 VSS
A08 ADDR6 3.3V O D18 P11TXENR 3.3V O P26 P7TXD3 3.3V I/O AC24 P5COL 3.3V I
A09 ADDR5 3.3V O D19 P11COLR 3.3V I/O R01 DAT A23 3.3V I/O AC25 P5TXD2 3.3V I/O
A10 nWE 3.3V O D20 VSS R02 DATA22 3.3V I/O AC26 P5TXD1 3.3V I/O
A11 nCS0 3.3V O D21 P10RXER 3.3V I R03 VDD AD01 DAT A5 3.3V I/O
A12 ADDR4 3.3V O D22 P10TXD2 3.3V O R04 VSS AD02 DATA4 3.3V I/O
A13 ADDR3 3.3V O D23 VSS R23 P7COL 3.3V I AD03 VDD
A14 ADDR2 3.3V O D24 P9RXD0 3.3V I R24 P7CRS 3.3V I AD04 P0CRS R 3.3V I/O
A15 ADDR1 3.3V O D25 P9TXD1 3.3V O R25 P6RXD3 3.3V I AD05 P0TXD1R 3.3V I/O
A16 ADDR0 3.3V O D26 P9TXD2 3.3V O R26 P6RXD2 3.3V I AD06 P0T XCLKR 3.3V I/O
A17 P11RXERR 3.3V I E01 DAT A43 3.3V I/O T 01 DATA21 3.3V I/O AD07 VDD
A18 P11TXD1R 3.3V O E02 DAT A42 3.3V I/O T 02 DATA20 3.3V I/O AD08 P1CRS R 3.3V I/O
A19 P11CRSR 3.3V I/O E03 ARLDIR0 3.3V O T03 LEDCLK 3.3V I/O AD09 P1T XD0R 3.3V I/O
A20 P10RXD3 3.3V I E04 ARLDIR1 3.3V O T04 CPUIRQ 3.3V O AD10 VDD
A21 P10RXD1 3.3V I E23 P9RXDV 3.3V I T23 P6RXD1 3.3V I AD11 P1RXDVR 3.3V I
A22 P10RXDV 3.3V I E24 P9T XEN 3.3V O T24 P6RXD0 3.3V I AD12 P1RXD3R 3.3V I
A23 P10TXD0 3.3V O E25 P9COL 3.3V I T25 P6RXDV 3.3V I AD13 P2T XD2R 3.3V O
A24 P10COL 3.3V I E26 P9CRS 3.3V I T26 P6RXCLK 3.3V I AD14 VDD
A25 P9RXD3 3.3V I F01 DAT A41 3.3V I/O U01 DATA19 3.3V I/O AD15 P2RXCLKR 3.3V I/O
A26 P9RXD1 3.3V I F02 DAT A40 3.3V I/O U02 DATA18 3.3V I/O AD16 P2RXD2R 3.3V I
B01 DATA49 3.3V I/O F03 VDD U03 VDD AD17 VDD
B02 DATA48 3.3V I/O F04 VSS U04 VSS AD18 P3TXD0R 3.3V O
B03 S TAT0 3.3V O F23 P9T XD0 3.3V O U23 VSS AD19 P3RXDVR 3.3V I
B04 S TAT2 3.3V O F24 P9TXD3 3.3V O U24 VDD AD20 VDD
B05 ADDR10 3.3V O F25 P8RXD3 3.3V I U25 P6RXER 3.3V I AD21 P4COL 3.3V I
B06 ADDR11 3.3V O F26 P8RXD2 3.3V I U26 P6TXCLK 3.3V I AD22 P4TXD0 3.3V O
B07 ADDR12 3.3V O G01 DAT A39 3.3V I/O V01 DATA17 3.3V I/O AD23 P4RXDV 3.3V I
B08 ADDR13 3.3V O G02 DAT A38 3.3V I/O V02 DATA16 3.3V I/O AD24 VDD
B09 ADDR14 3.3V O G03 VDD V03 VDD AD25 P4RXD3 3.3V I
B10 nOE 3.3V I/O G04 VSS V04 VSS AD26 P5CRS 3.3V I
B11 ADDR15 3.3V O G23 VSS V23 P6T XD0 3.3V I/O AE01 DATA3 3.3V I/O
B12 ADDR16 3.3V O G24 VDD V24 P6TXEN 3.3V O AE02 DAT A2 3.3V I/O
B13 nCS2 3.3V O G25 P8RXDV 3.3V I V25 P6TXD1 3.3V I/O AE03 VSS
B14 nCS3 3.3V O G26 P8RXCLK 3.3V I V26 P6TXD2 3.3V I/O AE04 P0TXD3R 3.3V I/O
B15 nCS1 3.3V O H01 DATA37 3.3V I/O W01 DATA15 3.3V I/O AE05 P0TXD0R 3.3V I/O
B16 P11RXDVR 3.3V I H02 DAT A36 3.3V I/O W02 DATA14 3.3V I/O AE06 P0RXCLKR 3.3V I/O
B17 P11RXCLKR 3.3V I/O H03 LED2 3.3V I/O W03 CPUDO 3.3V I/O AE07 P0RXD0R 3.3V I
B18 P11TXD0R 3.3V O H04 LED3 3.3V I/O W04 CPUDI 3.3V I AE08 P1COLR 3.3V I/O
B19 P11TXD2R 3.3V O H23 P8RXD1 3.3V I W23 P6CRS 3.3V I AE09 P1TXD2R 3.3V I/O
B20 P10RXD2 3.3V I H24 P8RXD0 3.3V I W24 P6COL 3.3V I AE10 P1TXCLKR 3.3V I/O
B21 P10RXD0 3.3V I H25 P8RXER 3.3V I W25 P6TXD3 3.3V I/O AE11 P1RXCLKR 3.3V I/O
B22 P10TXCLK 3.3V I H26 P8TXD0 3.3V O W26 P5RXD3 3.3V I AE12 P1RXD2R 3.3V I
B23 P10TXD1 3.3V O J01 DATA35 3.3V I/O Y01 DATA13 3.3V I/O AE13 P2TXD3R 3.3V O
B24 P10CRS 3.3V I J02 DATA34 3.3V I/O Y02 DATA12 3.3V I/O AE14 P2T XENR 3.3V O
B25 P9RXD2 3.3V I J03 VDD Y03 VDD AE15 P2RXERR 3.3V I
B26 P9RXER 3.3V I J04 VSS Y04 VS S AE16 P2RXD1R 3.3V I
C01 DATA47 3.3V I/O J23 P8TXCLK 3.3V I Y23 VSS AE17 P3COLR 3.3V I/O
C02 DATA46 3.3V I/O J24 P8T XEN 3.3V O Y24 VDD AE18 P3TXD2R 3.3V O
C03 VDD J25 P8TXD1 3.3V O Y25 P5RXD1 3.3V I AE19 P3TXCLKR 3.3V I/O
C04 ARLDIV 3.3V I J26 P8TXD2 3.3V O Y26 P5RXD2 3.3V I AE20 P3RXCLKR 3.3V I/O
C05 VDD K01 DATA33 3.3V I/O AA01 DATA11 3.3V I/O AE21 P3RXD2R 3.3V I
C06 ARLDI2 3.3V I K02 DATA32 3.3V I/O AA02 DATA10 3.3V I/O AE22 P4CRS 3.3V I
C07 VDD K03 VDD AA03 MDIO 3.3V I/O AE23 P4T XD2 3.3V O
C08 ARLDI0 3.3V I K04 VSS AA04 WCHDOG 3.3V O AE24 P4RXER 3.3V I
C09 VDD K23 VSS AA23 P5T XCLK 3.3V I AE25 P4RXD1 3.3V I
C10 VDD K24 VDD AA24 P5RXER 3.3V I AE26 P4RXD2 3.3V I
C11 ARLCLK 3.3V O K25 P8TXD3 3.3V O AA25 P5RXDV 3.3V I AF01 DATA1 3.3V I/O
C12 VDD K26 P8COL 3.3V I AA26 P5RXD0 3.3V I AF02 DATA0 3.3V I/O
C13 VDD L01 DATA31 3.3V I/O AB01 DATA9 3.3V I/O AF03 CLK50 3.3V I
C14 P11RXD2R 3.3V I L02 DATA30 3.3V I/O AB02 MDC 3.3V O AF04 P0TXD2R 3.3V I/O
C15 VDD L03 LED1 3.3V I/O AB03 DATA8 3.3V I/O AF05 P0RXERR 3.3V I
C 16 P11RXD0R 3.3V I L04 LED0 3.3V I/O AB04 VSS 3.3V I AF06 P0RXDVR 3.3V I
C17 VDD L23 P8CRS 3.3V I AB23 P5TXD3 3.3V I/O AF07 P0RXD1R 3.3V I
C18 P11TXCLKR 3.3V I/O L24 P7RXD3 3.3V I AB24 P5TXD0 3.3V I/O AF08 P0RXD2R 3.3V I
C19 P11TXD3R 3.3V O L25 P7RXD2 3.3V I AB25 P5TXEN 3.3V O AF09 P1TXD3R 3.3V I/O
C20 VDD L26 P7RXD1 3.3V I AB26 P5RXCLK 3.3V I AF10 P1T XENR 3.3V O
C21 P10RXCLK 3.3V I M01 DATA29 3.3V I/O AC01 DATA7 3.3V I/O AF11 P1RXERR 3.3V I
C22 P10TXEN 3.3V O M02 DATA28 3.3V I/O AC02 DATA6 3.3V I/O AF12 P1RXD1R 3.3V I
C23 P10TXD3 3.3V O M03 VDD AC03 nRES ET 3.3V I AF13 P2COLR 3.3V I/O
C24 VDD M04 VSS AC04 VSS AF14 P2TXD0R 3.3V O
C25 P9RXCLK 3.3V I M23 P7RXD0 3.3V I AC05 P0COLR 3.3V I/O AF15 P2TXCLKR 3.3V I/O
C26 P9TXCLK 3.3V I M24 P7RXDV 3.3V I AC06 P0TXENR 3.3V O AF16 P2RXD0R 3.3V I
D01 DATA45 3.3V I/O M25 P7RXCLK 3.3V I AC07 VS S AF17 P3CRSR 3.3V I/O
D02 DATA44 3.3V I/O M26 P7RXER 3.3V I AC08 P0RXD3R 3.3V I AF18 P3TXD3R 3.3V O
D03 VSS 3.3V I N01 DATA27 3.3V I/O AC09 P1TXD1R 3.3V I/O AF19 P3TXD1R 3.3V O
D04 VSS N02 DATA26 3.3V I/O AC10 VSS AF20 P3RXERR 3.3V I
D05 ARLDI3 3.3V I N03 LEDVLD1 3.3V I/O AC11 P1RXD0R 3.3V I AF21 P3RXD1R 3.3V I
D06 VSS N04 LEDVLD0 3.3V I/O AC12 P2CRSR 3.3V I/O AF22 P3RXD3R 3.3V I
D07 VSS N23 VSS AC13 P2TXD1R 3.3V O AF23 P4TXD3 3.3V O
D08 ARLDI1 3.3V I N24 VDD AC14 VS S AF24 P4TXEN 3.3V O
D09 VSS N25 P7TXCLK 3.3V I AC15 P2RXDVR 3.3V I AF25 P4T XCLK 3.3V I
D10 VSS N26 P7TXEN 3.3V O AC16 P2RXD3R 3.3V I AF26 P4RXD0 3.3V I

27

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

Table-8.3: Pin List By Name

Signal

Name

I/O Type Pin

Signal

Name

I/O Type P in

Signal

Name

I/O Type Pin

Signal

Name

I/O Type Pin

ADDR0 3.3V O A16 LEDVLD1 3.3V I/O N03 P5RXD0 3.3V I AA26 P11CRSR 3.3V I/O A19
ADDR1 3.3V O A15 MDC 3.3V O AB02 P5RXD1 3.3V I Y25 P11RXCLKR 3.3V I/O B17
ADDR2 3.3V O A14 MDIO 3.3V I/O AA03 P5RXD2 3.3V I Y26 P11RXD0R 3.3V I C16
ADDR3 3.3V O A13 nCS0 3.3V O A11 P5RXD3 3.3V I W26 P11RXD1R 3.3V I D16
ADDR4 3.3V O A12 nCS1 3.3V O B15 P5RXDV 3.3V I AA25 P11RXD2R 3.3V I C14
ADDR5 3.3V O A09 nCS2 3.3V O B13 P5RXER 3.3V I AA24 P11RXD3R 3.3V I D14
ADDR6 3.3V O A08 nCS3 3.3V O B14 P5TXCLK 3.3V I AA23 P11RXDVR 3.3V I B16
ADDR7 3.3V O A07 nOE 3.3V I/O B10 P5TXD0 3.3V I/O AB24 P11RXERR 3.3V I A17
ADDR8 3.3V O A06 nRESET 3.3V I AC03 P5TXD1 3.3V I/O AC26 P11TXCLKR 3.3V I/O C18

ADDR9 3.3V O A05 nWE 3.3V O A10 P5TXD2 3.3V I/O AC25 P11T XD0R 3.3V O B18
ADDR10 3.3V O B05 P0COLR 3.3V I/O AC05 P5TXD3 3.3V I/O AB23 P11TXD1R 3.3V O A18
ADDR11 3.3V O B06 P0CRSR 3.3V I/O AD04 P5TXEN 3.3V O AB25 P11TXD2R 3.3V O B19
ADDR12 3.3V O B07 P0RXCLKR 3.3V I/O AE06 P6COL 3.3V I W24 P11TXD3R 3.3V O C19
ADDR13 3.3V O B08 P0RXD0R 3.3V I AE07 P6CRS 3.3V I W23 P11TXENR 3.3V O D18
ADDR14 3.3V O B09 P0RXD1R 3.3V I AF07 P6RXCLK 3.3V I T26 STAT0 3.3V O B03
ADDR15 3.3V O B11 P0RXD2R 3.3V I AF08 P6RXD0 3.3V I T24 STAT1 3.3V O A03
ADDR16 3.3V O B12 P0RXD3R 3.3V I AC08 P6RXD1 3.3V I T23 S TAT2 3.3V O B04
ARLCLK 3.3V O C11 P0RXDVR 3.3V I AF06 P6RXD2 3.3V I R26 STAT3 3.3V O A04
ARLDI0 3.3V I C08 P0RXERR 3.3V I AF05 P6RXD3 3.3V I R25 VDD Power 3.3V AD03
ARLDI1 3.3V I D08 P0TXCLKR 3.3V I/O AD06 P6RXDV 3.3V I T 25 VDD Power 3.3V AD07
ARLDI2 3.3V I C06 P0T XD0R 3.3V I/O AE05 P6RXER 3.3V I U25 VDD Power 3.3V AD14
ARLDI3 3.3V I D05 P0TXD1R 3.3V I/O AD05 P6TXCLK 3.3V I U26 VDD Power 3.3V AD20

ARLDIR0 3.3V O E03 P0TXD2R 3.3V I/O AF04 P6TXD0 3.3V I/O V23 VDD Power 3.3V AD24
ARLDIR1 3.3V O E04 P0TXD3R 3.3V I/O AE04 P6TXD1 3.3V I/O V25 VDD Power 3.3V C03

ARLDIV 3.3V I C04 P0T XENR 3.3V O AC06 P6TXD2 3.3V I/O V26 VDD Power 3.3V C05

ARLS YNC 3.3V O D11 P1COLR 3.3V I/O AE08 P6TXD3 3.3V I/O W25 VDD Power 3.3V C09

CLK50 3.3V I AF03 P1CRSR 3.3V I/O AD08 P6TXEN 3.3V O V24 VDD Power 3.3V C12

CPUDI 3.3V I W04 P1RXCLKR 3.3V I/O AE11 P7COL 3.3V I R23 VDD Power 3.3V C13
CPUDO 3.3V I/O W03 P1RXD0R 3.3V I AC11 P7CRS 3.3V I R24 VDD Power 3.3V C15
CPUIRQ 3.3V O T04 P1RXD1R 3.3V I AF12 P7RXCLK 3.3V I M25 VDD Power 3.3V C20

DATA0 3.3V I/O AF02 P1RXD2R 3.3V I AE12 P7RXD0 3.3V I M23 VDD Power 3.3V C24
DATA1 3.3V I/O AF01 P1RXD3R 3.3V I AD12 P7RXD1 3.3V I L26 VDD Power 3.3V G03
DATA2 3.3V I/O AE02 P1RXDVR 3.3V I AD11 P7RXD2 3.3V I L25 VDD Power 3.3V J03
DATA3 3.3V I/O AE01 P1RXERR 3.3V I AF11 P7RXD3 3.3V I L24 VDD Power 3.3V N24
DATA4 3.3V I/O AD02 P1TXCLKR 3.3V I/O AE10 P7RXDV 3.3V I M24 VDD Power 3.3V P03
DATA5 3.3V I/O AD01 P1TXD0R 3.3V I/O AD09 P7RXER 3.3V I M26 VDD Power 3.3V R03
DATA6 3.3V I/O AC02 P1TXD1R 3.3V I/O AC09 P7TXCLK 3.3V I N25 VDD Power 3.3V Y24
DATA7 3.3V I/O AC01 P1TXD2R 3.3V I/O AE09 P7T XD0 3.3V I/O P23 VDD Power 3.3V AD17
DATA8 3.3V I/O AB03 P1T XD3R 3.3V I/O AF09 P7TXD1 3.3V I/O P24 VDD Power 3.3V C10

DATA9 3.3V I/O AB01 P1T XENR 3.3V O AF10 P7T XD2 3.3V I/O P25 VDD Power 3.3V K03
DATA10 3.3V I/O AA02 P2COLR 3.3V I/O AF13 P7TXD3 3.3V I/O P26 VDD Power 3.3V K24
DATA11 3.3V I/O AA01 P2CRSR 3.3V I/O AC12 P7TXEN 3.3V O N26 VDD Power 3.3V U03
DATA12 3.3V I/O Y02 P2RXCLKR 3.3V I/O AD15 P8COL 3.3V I K26 VDD Power 3.3V U24
DATA13 3.3V I/O Y01 P2RXD0R 3.3V I AF16 P8CRS 3.3V I L23 VDD Power 3.3V Y03
DATA14 3.3V I/O W02 P2RXD1R 3.3V I AE16 P8RXCLK 3.3V I G26 VDD Power 3.3V AD10
DATA15 3.3V I/O W01 P2RXD2R 3.3V I AD16 P8RXD0 3.3V I H24 VDD Power 3.3V C07
DATA16 3.3V I/O V02 P2RXD3R 3.3V I AC16 P8RXD1 3.3V I H23 VDD Power 3.3V C17
DATA17 3.3V I/O V01 P2RXDVR 3.3V I AC15 P8RXD2 3.3V I F26 VDD Power 3.3V F03
DATA18 3.3V I/O U02 P2RXERR 3.3V I AE15 P8RXD3 3.3V I F25 VDD Power 3.3V G24
DATA19 3.3V I/O U01 P2TXCLKR 3.3V I/O AF15 P8RXDV 3.3V I G25 VDD Power 3.3V M03
DATA20 3.3V I/O T02 P2TXD0R 3.3V O AF14 P8RXER 3.3V I H25 VDD Power 3.3V V03
DATA21 3.3V I/O T01 P2TXD1R 3.3V O AC13 P8TXCLK 3.3V I J23 VSS 3.3V I AB04
DATA22 3.3V I/O R02 P2TXD2R 3.3V O AD13 P8TXD0 3.3V O H26 VSS 3.3V I D03
DATA23 3.3V I/O R01 P2TXD3R 3.3V O AE13 P8TXD1 3.3V O J25 VSS Ground D09
DATA24 3.3V I/O P02 P2TXENR 3.3V O AE14 P8TXD2 3.3V O J26 VSS Ground D12
DATA25 3.3V I/O P01 P3COLR 3.3V I/O AE17 P8TXD3 3.3V O K25 VSS Ground D15
DATA26 3.3V I/O N02 P3CRSR 3.3V I/O AF17 P8T XEN 3.3V O J24 VSS Ground D20
DATA27 3.3V I/O N01 P3RXCLKR 3.3V I/O AE20 P9COL 3.3V I E25 VSS Ground G04
DATA28 3.3V I/O M02 P3RXD0R 3.3V I AC19 P9CRS 3.3V I E26 VS S Ground AC04
DATA29 3.3V I/O M01 P3RXD1R 3.3V I AF21 P9RXCLK 3.3V I C25 VSS Ground AC14
DATA30 3.3V I/O L02 P3RXD2R 3.3V I AE21 P9RXD0 3.3V I D24 VSS Ground AC23
DATA31 3.3V I/O L01 P3RXD3R 3.3V I AF22 P9RXD1 3.3V I A26 VSS Ground D04
DATA32 3.3V I/O K02 P3RXDVR 3.3V I AD19 P9RXD2 3.3V I B25 VSS Ground D10
DATA33 3.3V I/O K01 P3RXERR 3.3V I AF20 P9RXD3 3.3V I A25 VS S Ground D13
DATA34 3.3V I/O J02 P3TXCLKR 3.3V I/O AE19 P9RXDV 3.3V I E23 VSS Ground K04
DATA35 3.3V I/O J01 P3TXD0R 3.3V O AD18 P9RXER 3.3V I B26 VS S Ground K23
DATA36 3.3V I/O H02 P3TXD1R 3.3V O AF19 P9TXCLK 3.3V I C26 VSS Ground P04
DATA37 3.3V I/O H01 P3TXD2R 3.3V O AE18 P9TXD0 3.3V O F23 VSS Ground R04
DATA38 3.3V I/O G02 P3TXD3R 3.3V O AF18 P9TXD1 3.3V O D25 VSS Ground Y04
DATA39 3.3V I/O G01 P3T XENR 3.3V O AC18 P9TXD2 3.3V O D26 VSS Ground AC07
DATA40 3.3V I/O F02 P4COL 3.3V I AD21 P9TXD3 3.3V O F24 VSS Ground AC10
DATA41 3.3V I/O F01 P4CRS 3.3V I AE22 P9TXEN 3.3V O E24 VSS Ground AC17
DATA42 3.3V I/O E02 P4RXCLK 3.3V I AC22 P10COL 3.3V I A24 VSS Ground AC20
DATA43 3.3V I/O E01 P4RXD0 3.3V I AF26 P10CRS 3.3V I B24 VSS Ground AE03
DATA44 3.3V I/O D02 P4RXD1 3.3V I AE25 P10RXCLK 3.3V I C21 VSS Ground D06
DATA45 3.3V I/O D01 P4RXD2 3.3V I AE26 P10RXD0 3.3V I B21 VSS Ground D07
DATA46 3.3V I/O C02 P4RXD3 3.3V I AD25 P10RXD1 3.3V I A21 VSS Ground D17
DATA47 3.3V I/O C01 P4RXDV 3.3V I AD23 P10RXD2 3.3V I B20 VSS Ground D23
DATA48 3.3V I/O B02 P4RXER 3.3V I AE24 P10RXD3 3.3V I A20 VSS Ground F04
DATA49 3.3V I/O B01 P4TXCLK 3.3V I AF25 P10RXDV 3.3V I A22 VSS Ground G23
DATA50 3.3V I/O A02 P4TXD0 3.3V O AD22 P10RXER 3.3V I D21 VSS Ground J04
DATA51 3.3V I/O A01 P4TXD1 3.3V O AC21 P10T XCLK 3.3V I B22 VSS Ground M04

LED0 3.3V I/O L04 P4TXD2 3.3V O AE23 P10T XD0 3.3V O A23 VS S Ground N23
LED1 3.3V I/O L03 P4TXD3 3.3V O AF23 P10TXD1 3.3V O B23 VSS Ground U04
LED2 3.3V I/O H03 P4TXEN 3.3V O AF24 P10TXD2 3.3V O D22 VSS Ground U23
LED3 3.3V I/O H04 P5COL 3.3V I AC24 P10TXD3 3.3V O C23 VSS Ground V04

LEDCLK 3.3V I/O T03 P5CRS 3.3V I AD26 P10TXEN 3.3V O C22 VSS Ground Y23

LEDVLD0 3.3V I/O N04 P5RXCLK 3.3V I AB26 P11COLR 3.3V I/O D19 WCHDOG 3.3 V O AA04

28

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

t1 t2

RXCLK

RXDV

RXD[3:0]

RXER

T# Description: MIN TYP MAX UNIT

t1 RX_DV, RXD, RX_ER setup time 5 - - ns
t2 RX_DV, RXD, RX_ER hold time 5 - - ns

MII R eceive Timin g

9. TIMING DESCRIPTION

TXCLK

TXEN

TXD[3:0]

t2t1

T# Desciption Min Typ Max Unit

t1 TXEN, TXD setup time 10 - - ns
t2 TXEN, TXD hold time 10 - - ns

MII T ra nsmit Tim ing

29

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

RXCLK

RXDV

RXD[3:0]

t1 t2

T# Description: MIN TYP MAX UNIT

t1 RXDV, RXD setup time 10 - ns

T2 RXDV, RXD hold time 10 ns

Rev e rs e d MII Receiv e Tim in g

t1 t2

TXCLK

TXEN

TXD[3:0]

T# Description: MIN TYP MAX UNIT

t1 RXDV, RXD setup time 5 - ns

T2 RXDV, RXD hold time 5 ns

Reversed MII Transmit Timing

30

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

RXCLK

RXD[3:0]

RXDV

t1

T# Desciption Min Typ Max Unit

t1 RXD to RXDV 0 - - ns

Reversed MII Packet Timing (Start of Packet)

RXCLK

RXD[3:0]

RXDV

t1

T# Desciption Min Typ Max Unit

t1 PXD to RXDV delay time 0 - - ns

Reversed MII Packet Timing (End of Packet)

31

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

t1

MDC

MDIO

PHY Management Read Timing

t2

T# Description MIN TYP MAX UNIT

t1 MDIO setup time 0 - 300 ns
t2 MDC cycle - 800 - ns

t1

t2

MDC

MDIO

t3

t4

t5

T # D es cription MIN T YP MAX UNIT

t1 M DC High t ime 300 - 500 ns
t2 MD C Low time 300 - 500 ns
t3 M D C p e r iod - 800 - ns
t4 MDIO set up time 10 - - ns
t5 MDIO hold time 10 - - ns

PHY Management Write Timing

32

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

t1

ADDRESS

DATA

__

OE

__

CE

t2 t3

VALID DATA

t4

t5

t7

t6

t9

t8

HIGH-ZHIGH-Z

T# Description MIN TYP MAX UNIT

t1 Read cycle time - 20 - n s
t2 A ddress access time - - 12 ns
t3 Outpu t h old tim e 0 - - n s
t4 O E a cc e ss time - - 12 ns
t5 CE a cc e ss time - - 1 2 ns
t6 O E to Lo w -Z o u tpu t 0 - - ns
t7 CE to Low-Z output 0 - - ns
t8 O E to H igh -Z o u tpu t - - 6 ns
t9 CE to H igh -Z o utp u t - - 6 ns

SRAM Read Tim ing

SRAM Read Timing

t1

ADDRESS

DATA

__

CE

t2 t3

VALID DATA

t6

t4

t8t7

___
WE

t5

T# D escription MIN TY P M AX U NIT

t1 W rite cycle time - 20 - ns
t2 A ddress Setup to Write End time 12 - - ns
t3 A ddress hold for W rite End time 0 - - ns
t4 C E to Write End time 12 - - ns
t5 A ddress Setup time 4 - - ns
t6 W E pulse width 8 - - ns
t7 Data S etu p to W rite E nd 8 - - ns
t8 Data Ho ld for Write End 0 - - n s

SRAM Write Tim ing

33

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

t2 t3

DA1

Result1

DA2

ARLCLK

ARLDO

ARLDI

t1

Result2

ARL Result Timing

T # D es cr iption MIN T YP MAX UNIT

t1 time betw e en DAs 0 - - ns
t2 time for ARL result 0 - 200 ns
t3 time betw e en results 0 - - ns

t2

CPUDI

idle state

start

bit

bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7

stop

bit

t1

CPUDO

stop

bit

start

bit

stop

bit

t3

bit

7

bit

6

bit0

CPU Command Timing

t4

T # Des cr iption MIN T Y P MAX U NIT

t1 C PU idle time 0 - - us
t2 C PU c o mman d bi t t i me 10 - 1000 us
t 3 Re sponse time 0 - 20 ms
t4 Command ti me - - 2 0 ms

34

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

10. ELECTRICAL SPECIFICATION

Absolute Maximum Ratings
Operation at absolute maximum ratings is not implied

exposure to stresses outside those listed could cause
permanent damage to the device.

Recommended Operation Conditions

nLED0

nLED1

nLED3

nLED2

LEDCLK

P11

P10

P9

P2

P1P0P11

P10

P9

P2P1P0

LED Signal Timing

LEDVLD0

LEDVLD1

FDX

SPD

LNK

FDX

SPD

LNK

FDX

SPD

LNK

FDX

SPD

LNK

FDX

SPD

LNK

FDX

SPD

LNK

ERR

COL

RCV

XMT

ERR

COL

RCV

XMT

ERR

COL

RCV

XMT

ERR

COL

RCV

XMT

ERR

COL

RCV

XMT

ERR

COL

RCV

XMT

DC Supply voltage : VDD -0.3V ~ +5.0V
DC input current: Iin +/-10 mA
DC input voltage: Vin -0.3 ~ VDD + 0.3V
DC output voltage: Vout -0.3 ~ VDD + 0.3V

Storage temperature: Tstg -40 to +125

o

C

Supply voltage: VDD 3.3V, +/-0.3V
Operating temperature: Ta 0

o

C -70 oC

M aximum power consumption 3.3W

35

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

Side View

11. PACKAGING

0.6

2.33

0.56

Bottom View

31.75

0.75

0.6351.27

2

4

6

8

10

12

14

16

18

20

22

24

26

AA

AB

AC

AD

AE

AF

A

B

C

D

E

F

G

H

J

K

L

M

N

P

R

T

U

V

W

Y

11

13

15

17

19

21

23

25

1

3

5

7

9

Top View

30

35

Advanced

Comm.

Devices

FLLLLL

SMAYYWW

ACD82112

36

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

Address Resolution Logic

(The built-in ARL with 2048 MAC Addresses)

Appendix-A1

37

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

1. SUMMARY

The internal Address Resolution Logic (ARL) of ACD’s
switch controllers automatically builds up an address
table and maps up to 2,048 MAC addresses into their
associated port. It can work by itself without any CPU
intervention in an UN-managed system.

For a managed system, the management CPU can con­figure the operation mode of the ARL, learn all the ad­dress in the address table, add new address into the
table, control security or filtering feature of each ad­dress entry etc.

The ARL is designed with such a high performance that
it will never slow down the frame switching operation. It
helps the switch controllers to reach wire speed for­warding rate under any type of traffic load.

The address space can be expanded to 1 1K entries by
using the external ARL, the ACD80800.

2. FEA TURES

• Supports up to 2,048 MAC address lookup

• Provides UART type of interface for the manage-

ment CPU

• Wire speed address lookup time.

• Wire speed address learning time.

• Address can be automatically learned from switch

without the CPU intervention

• Address can be manually added by the CPU through
the CPU interface

• Each MAC address can be secured by the CPU
from being changed or aged out

• Each MAC address can be marked by the CPU
from receiving any frame

• Each newly learned MAC address is notified to the
CPU

• Each aged out MAC address is notified to the CPU

• Automatic address aging control, with configurable

aging period

CPU Interface

Address

Registers

Data

Registers

Command

Registers

Control

Registers

Switch Interface

Address

Learning

Engine

CPU Interface Engine

Address Table

(2048 Entries)

Figure-1. ARL Block Diagram

Address

Aging

Engine

Address

Lookup

Engine

38

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

Data Sheet: ACD8211 2

INTRODUCTORY

3. FUNCTIONAL DESCRIPTION

The ARL provides Address Resolution service for ACD’s
switch controllers.

Figure 2

is a block diagram of the

ARL.
Traffic Snooping
All Ethernet frames received by ACD’s switch controller

have to be stored into memory buffer. As the frame
data are written into memory, the status of the data
shown on the data bus are displayed by ACD’s switch
controller through a state bus. The ARL’s Switch Con­troller Interface contains the signals of the data bus and
the state bus. By snooping the data bus and the state
bus of ACD’s switch controller , the ARL can detect the
occurrence of any destination MAC address and source
MAC address embedded inside each frame.

Address Learning
Each source address caught from the data bus, to-

gether with the ID of the ingress port, is passed to the
Address Learning Engine of the ARL. The Address
Learning Engine will first determine whether the frame
is a valid frame. For a valid frame, it will first try to find
the source address from the current address table. If
that address doesn’t exist, or if it does exist but the port
ID associated with the MAC address is not the ingress
port, the address will be learned into the address table.
After an address is learned by the address learning
engine, the CPU will be notified to read this newly learned
address so that it can add it into the CPU’s address
table.

Address Aging
After each source address is learned into the address

table, it has to be refreshed at least once within each
address aging period. Refresh means it is caught again
from the switch interface. If it has not occurred for a
pre-set aging period, the address aging engine will re­move the address from the address table. After an ad­dress is removed by the address aging engine, the CPU
will be notified through interrupt request that it needs to
read this aged out address so that it can remove this
address from the CPU’s address table.

Address Lookup
Each destination address is passed to the Address

Lookup Engine of the ARL. The Address Lookup En­gine checks if the destination address matches with
any existing address in the address table. If it does, the
ARL returns the associated Port ID to ACD’s switch
controller through the output data bus. Otherwise, a no
match result is passed to ACD’s switch controller through
the output data bus.

CPU Interface
The CPU can access the registers of the ARL by send-

ing commands to the UART data input line. Each com­mand is consisted by action (read or write), register
type, register index, and data. Each result of command
execution is returned to the CPU through the UART data
output line.

CPU Interface Registers
The ARL provides a bunch of registers for the control

CPU. Through the registers, the CPU can read all ad­dress entries of the address table, delete particular ad­dresses from the table, add particular addresses into
the table, secure an address from being changed, set
filtering on some addresses, change the hashing algo­rithm etc. Through a proper interrupt request signal, the
CPU can be notified whenever it needs to retrieve data
for a newly-learned address or an aged-out address so
that the CPU can build an exact same address table
learned by the ARL.

CPU Interface Engine
The command sent by the control CPU is executed by

the CPU Interface Engine. For example, the CPU may
send a command to learn the first newly-learned ad­dress. The CPU Interface Engine is responsible to find
the newly-learned address from the address table, and
passes it to CPU. The CPU may request to learn next
newly-learned address. Then, it is again the responsi­bility of the CPU Interface Engine to search for next
newly-learned address from the address table.

Address T able
The address table can hold up to 2,048 MAC addresses,

together with the associated port ID, security flag, filter­ing flag, new flag, aging information etc. The address
table resides in the embedded SRAM inside the ARL.

39

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Data Sheet: ACD8211 2

INTRODUCTORY

Header Address Data Checksum

Header Address Data Checksum

4. INTERFACE DESCRIPTION

CPU Interface
The CPU can communicate with the ARL through the

UART interface of the switch IC. The management CPU
can send command to the ARL by writing into associ­ated registers, and retrieve result from ARL by reading
corresponding registers. The registers are described
in the section of “Register Description.” The CPU inter­face signals are described by

table-1

:

UARTDI is used by the control CPU to send command
into the ARL. The baud rate will be automatically de­tected by the ARL. The result will be returned through
the UARTDO line with the detected baud rate. The for­mat of the command packet is shown as follows:

where:

• Header is further defined as:

b1:b0 - read or write, 01 for read, 11
for write
b4:b2 - device number, 000 to 111 (0
to 7, same as the host switch control­ler)
b7:b5 - device type, 010 for ARL

• Address - 8-bit value used to select the reg­ister to access

• Data - 32-bit value, only the LSB is used
for write operation, all 0 for read operation

• Checksum - 8-bit value of XOR of all bytes

UARTDO is used to return the result of command ex­ecution to the CPU. The format of the result packet is
shown as follows:

where:

• Header is further defined as:

b1:b0 - read or write, 01 for read, 11
for write
b4:b2 - device number, 000 to 111 (0
to 7)
b7:b5 - device type, 010 for ARL

• Address - 8-bit value for address of the
selected register

• Data - 32-bit value, only the LSB is used
for read operation, all 0 for write operation

• Checksum - 8-bit value of XOR of all bytes

The ARL will always check the CMD header to see if
both the device type and the device number matches
with its setting. If not, it ignores the command and will
not generate any response to this command.

Table-1: C PU Interface

Name I/O Description

UARTDI I UART input data line.
UARTDO O UART output data line.

40

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Data Sheet: ACD8211 2

INTRODUCTORY

The

DataRegX

are registers used to pass the param­eter of the command to the ACD80800, and the result
of the command to the CPU.

The

AddrRegX

are registers used to specify the ad-

dress associated with the command.
The

CmdReg

is used to pass the type of command to

the ACD80800. The command types are listed in

table-

3

. The details of each command is described in the

chapter of “Command Description.”

The

RstReg

is used to indicate the status of command

execution. The result code is listed as follows:

•

01 - command is being executed and is
not done yet

•

10 - command is done with no error

•

1x - command is done, with error indi­cated by x, where x is a 4-bit error code:
0001 for cannot find the entry as speci­fied

5. REGISTER DESCRIPTION

ACD80800 provides a bunch of registers for the CPU
to access the address table inside it. Command is sent
to ACD80800 by writing into the associated registers.
Before the CPU can pass a command to ACD80800, it
must check the result register

(register 1 1)

to see if the
command has been done. When the Result register
indicates the command has been done, the CPU may
need to retrieve the result of previous command first.
After that, the CPU has to write the associated param­eter of the command into the Data registers. Then, the
CPU can write the command type into the command
register. When a new command is written into the com­mand register, ACD80800 will change the status of the
Result register to 0. The Result register will indicate the
completion of the command at the end of the execution.
Before the completion of the execution, any command
written into the command register is ignored by
ACD80800.

The registers accessible to the CPU are described by

table-2

:

Table-3: Command List

Command Description

0x09

Add the specified MAC address into the
address table

0x0A

Set a lock for the specified MAC
address

0x0B

Set a filtering flag for the specified MAC
address

0x0C

Delete the specified MAC address from
the address table

0x0D

Assign a port ID to the specified MAC
address

0x10 Read the first entry of the address table
0x11 Read next entry of address book
0x20 Read first valid entry
0x21 Read next valid entry
0x30 Read first new page
0x31 Read next new page
0x40 Read first aged page
0x41 Read next aged page
0x50 Read first locked page
0x51 Read next locked page
0x60 Read first filtered page
0x61 Read next filtered page
0x80 Read first page with specified PID
0x81 Read next page with specified PID

0xFF System reset

Table-2: R egist er Descr iption

Re g. Name Description

0 DataReg0 Byte 0 of data
1 DataReg1 Byte 1 of data
2 DataReg2 Byte 2 of data
3 DataReg3 Byte 3 of data
4 DataReg4 Byte 4 of data
5 DataReg5 Byte 5 of data
6 DataReg6 Byte 6 of data
7 DataReg7 Byte 7 of data
8 AddrReg0 LSB of address value

9 AddrReg1 MSB of address value
10 CmdReg Command register
11 RsltReg Result register
12 CfgReg Configuration register
13 IntSrcReg Interrupt source register
14 IntMskReg Interrupt mask register

15 nLearnReg0

Address learning disable
register for port 0 - 7

16 nLearnReg1

Address learning disable
register for port 8 - 15

17 nLearnReg2

Address learning disable
register for port 16 - 23

18 AgeTimeReg0 LSB of aging period register

19 AgeTimeReg1

MSB of aging period
register

20 P osCfg

Power On Strobe
configuration register 0

41

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Data Sheet: ACD8211 2

INTRODUCTORY

The

CfgReg

is used to configure the way the ACD80800

works. The bit definition of CfgReg is described as:

•

bit 0 - disable address aging

•

bit 1 - disable address lookup

•

bit 2 - disable DA cache

•

bit 3 - disable SA cache

•

bit 7:4 - hashing algorithm selection, de­fault is 0000

The

IntSrcReg

is used to indicate what can cause in­terrupt request to CPU. The source of interrupt is listed
as:

•

bit 0 - aged address exists

•

bit 1 - new address exists

•

bit 2 - reserved

•

bit 3 - reserved

•

bit 4 - bucket overflowed

•

bit 5 - command is done

•

bit 6 - system initialization is completed

•

bit 7 - self test failure

The

IntMskReg

is used to enable an interrupt source to
generate an interrupt request. The bit definition is the
same as IntSrcReg. A 1 in a bit enables the corre­sponding interrupt source to generate an interrupt re­quest once it is set.

The

nLearnReg[2:0]

are used to disable address learn­ing activity from a particular port. If the bit correspond­ing to a port is set, ACD80800 will not try to learn new
addresses from that port.

The

AgeTimeReg[1:0]

are used to specify the period of
address aging control. The aging period can be from 0
to 65535 units, with each unit counted as 2.684 sec­ond.

The

PosCfgReg

is a configuration register whose de­fault value is determined by the pull-up or pull-down
status of the associated hardware pin. The bits of
PosCfgReg0 is listed as follows:

•

bit 1* - NOCPU*, “0” = presence of control
CPU, “1” = no control CPU;

•

bit 0 - CPUGO, “0” = wait for System Start
command from CPU before starting self
initialization, “1” = CPU ready. Only effec­tive when bit-1 (NOCPU) is set to 0;

Note: When

NOCPU

is set as 0, ACD80800 will not
start the initialization process until a System Start com­mand is sent to the command register.

42

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Data Sheet: ACD8211 2

INTRODUCTORY

6. COMMAND DESCRIPTION

Command 09H

Description:

Add the specified MAC address into the

address table.

Parameter:

Store the MAC address into DataReg5 ­DataReg0, with DataReg5 contains the MSB of the MAC
address and DataReg0 contains the LSB. Store the as­sociated port number into DataReg6.

Result:

the MAC address will be stored into the address
table if there is space available. The result is indicated
by the Result register.

Command 0AH

Description:

Set the Lock bit for the specified MAC

address.

Parameter:

Store the MAC address into DataReg5 ­DataReg0, with DataReg5 contains the MSB of the MAC
address and DataReg0 contains the LSB.

Result:

the state machine will seek for an entry with
matched MAC address, and set the Lock bit of the en­try . The result is indicated by the Result register .

Command 0BH

Description:

Set the Filter flag for the specified MAC

address.

Parameter:

Store the MAC address into DataReg5 ­DataReg0, with DataReg5 contains the MSB of the MAC
address and DataReg0 contains the LSB.

Result:

the state machine will seek for an entry with
matched MAC address, and set the Filter bit of the en­try . The result is indicated by the Result register .

Command 0CH

Description:

Delete the specified MAC address from

the address table.

Parameter:

Store the MAC address into DataReg5 ­DataReg0, with DataReg5 contains the MSB of the MAC
address and DataReg0 contains the LSB.

Result:

the MAC address will be removed from the ad­dress table. The result is indicated by the Result regis­ter.

Command 0DH

Description:

Assign the associated port number to the

specified MAC address.

Parameter:

Store the MAC address into DataReg5 ­DataReg0, with DataReg5 contains the MSB of the MAC
address and DataReg0 contains the LSB. Store the port
number into DataReg6.

Result:

the port ID field of the entry containing the speci­fied MAC address will be changed accordingly. The
result is indicated by the Result register.

Command 10H

Description:

Read the first entry of the address table.

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
the first entry of the address book will be stored into the
Data registers. The MAC address will be stored into
DataReg5 - DataReg0, with DataReg5 contains the MSB
of the MAC address and DataReg0 contains the LSB.
The port number is stored in DataReg6, and the Flag

*

bits are stored in DataReg7.The Read Pointer will be
set to point to second entry of the address book.

Note - the Flag bits are defined as:

where:

• Filter - 1 indicates the frame heading to
this address should be dropped.

• Lock - 1 indicates the entry should never
be changed or aged out.

• New - 1 indicates the entry is a newly
learned address.

• Old - 1 indicates the address has been
aged out.

• Age - 1 indicates the address has not been
visited for current age cycle.

• V alid - 1 indicates the entry is a valid one.

• Rsvd - Reserved bits.

b7 b6 b5 b4 b3 b2 b1 b0

Rsvd Rsvd Filter Lock New Old Age V alid

43

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Data Sheet: ACD8211 2

INTRODUCTORY

Command 1 1H

Description:

Read next entry of address book.

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
the address book entry pointed by Read Pointer will be
stored into the Data registers. The MAC address will be
stored into DataReg5 - DataReg0, with DataReg5 con­tains the MSB of the MAC address and DataReg0 con­tains the LSB. The port number is stored in DataReg6,
and the Flag bits are stored in DataReg7. The Read
Pointer will be increased by one.

Command 20H

Description:

Read first valid entry.

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
first valid entry of the address book will be stored into
the Data registers. The MAC address will be stored into
DataReg5 - DataReg0, with DataReg5 contains the MSB
of the MAC address and DataReg0 contains the LSB.
The port number is stored in DataReg6, and the Flag
bits are stored in DataReg7. The Read Pointer is set to
point to this entry .

Command 21H

Description:

Read next valid entry .

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
next valid entry from the Read Pointer of the address
book will be stored into the Data registers. The MAC
address will be stored into DataReg5 - DataReg0, with
DataReg5 contains the MSB of the MAC address and
DataReg0 contains the LSB. The port number is stored
in DataReg6, and the Flag bits are stored in DataReg7.
The Read Pointer is set to point to this entry .

Command 30H

Description:

Read first new page.

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
first new entry of the address book will be stored into

the Data registers. The MAC address will be stored into
DataReg5 - DataReg0, with DataReg5 contains the MSB
of the MAC address and DataReg0 contains the LSB.
The port number is stored in DataReg6, and the Flag
bits are stored in DataReg7. The Read Pointer is set to
point to this entry .

Command 31H

Description:

Read next new entry .

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
next new entry from the Read Pointer of the address
book will be stored into the Data registers. The MAC
address will be stored into DataReg5 - DataReg0, with
DataReg5 contains the MSB of the MAC address and
DataReg0 contains the LSB. The port number is stored
in DataReg6, and the Flag bits are stored in DataReg7.
The Read Pointer is set to point to this entry .

Command 40H

Description:

Read first aged entry.

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
first aged entry of the address book will be stored into
the Data registers. The MAC address will be stored into
DataReg5 - DataReg0, with DataReg5 contains the MSB
of the MAC address and DataReg0 contains the LSB.
The port number is stored in DataReg6, and the Flag
bits are stored in DataReg7. The Read Pointer is set to
point to this entry .

Command 41H

Description:

Read next aged entry .

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
next aged entry from the Read Pointer of the address
book will be stored into the Data registers. The MAC
address will be stored into DataReg5 - DataReg0, with
DataReg5 contains the MSB of the MAC address and
DataReg0 contains the LSB. The port number is stored
in DataReg6, and the Flag bits are stored in DataReg7.
The Read Pointer is set to point to this entry .

44

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Data Sheet: ACD8211 2

INTRODUCTORY

Command 50H

Description:

Read first locked entry.

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
first locked entry of the address book will be stored into
the Data registers. The MAC address will be stored into
DataReg5 - DataReg0, with DataReg5 contains the MSB
of the MAC address and DataReg0 contains the LSB.
The port number is stored in DataReg6, and the Flag
bits are stored in DataReg7. The Read Pointer is set to
point to this entry .

Command 51H

Description:

Read next locked entry .

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
next locked entry from the Read Pointer of the address
book will be stored into the Data registers. The MAC
address will be stored into DataReg5 - DataReg0, with
DataReg5 contains the MSB of the MAC address and
DataReg0 contains the LSB. The port number is stored
in DataReg6, and the Flag bits are stored in DataReg7.
The Read Pointer is set to point to this entry .

Command 60H

Description:

Read first filtered page.

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
first filtered entry of the address book will be stored into
the Data registers. The MAC address will be stored into
DataReg5 - DataReg0, with DataReg5 contains the MSB
of the MAC address and DataReg0 contains the LSB.
The port number is stored in DataReg6, and the Flag
bits are stored in DataReg7. The Read Pointer is set to
point to this entry .

Command 61H

Description:

Read next valid entry .

Parameter:

None

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
next filtered entry from the Read Pointer of the address

book will be stored into the Data registers. The MAC
address will be stored into DataReg5 - DataReg0, with
DataReg5 contains the MSB of the MAC address and
DataReg0 contains the LSB. The port number is stored
in DataReg6, and the Flag bits are stored in DataReg7.
The Read Pointer is set to point to this entry .

Command 80H

Description:

Read first entry with specified port num-

ber.

Parameter:

Store port number into DataReg6.

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
first entry of the address book with the said port num­ber will be stored into the Data registers. The MAC ad­dress will be stored into DataReg5 - DataReg0, with
DataReg5 contains the MSB of the MAC address and
DataReg0 contains the LSB. The port number is stored
in DataReg6, and the Flag bits are stored in DataReg7.
The Read Pointer is set to point to this entry .

Command 81H

Description:

Read next valid entry .

Parameter:

Store port number into DataReg6.

Result:

The result is indicated by the Result register. If
the command is completed with no error, the content of
next entry from the Read Pointer of the address book
with the said port number will be stored into the Data
registers. The MAC address will be stored into DataReg5

- DataReg0, with DataReg5 contains the MSB of the
MAC address and DataReg0 contains the LSB. The
port number is stored in DataReg6, and the Flag bits
are stored in DataReg7. The Read Pointer is set to point
to this entry .

Command FFH

Description:

System reset.

Parameter:

None

Result:

This command will reset the ARL system. All

entries of the address book will be cleared.