PMC PM3350 Datasheet

PMC-Sierra,Inc.

8-Port 10 Mbit/s Switch

Preliminary

PM3350

ELAN 8x10

FEATURES

• Single-chip, 8-port, 10BaseT Ethernet
switch device f or low-cost unmanaged
and managed networks.

• On-chip SmartPath 50 MHz RISC
CPU core, multi-channel DMA
controller, MAC-layer interface logic,
FIFOs, PCI-based expans ion port, and
a flexible memory controller.

• CPU supports backgro und applications
running on local OS (e.g., SNMP), and
real-time data-oriented applications
(e.g., packet forwarding and filtering
decisions).

• Concurrently switches packets
between eight independent, half­duplex ports at the full Ethernet rate of
10 Mbit/s.

• Fully compatible with th e PM3351,
1-port 10/100 Mbit/s switch device;
may be used to create a compact and
inexpensive mixed 10/100 Mbit/s
switching hub.

• Store-and-forward operation with full
error checki ng and filtering.

• Low-latency operation in both unicast
and broadcast modes.

• Filtering and switching at wire rates (up
to 148,8000 packets per second),
supporting a mix of Ethernet and
IEEE 802.3 protocols.

• Performs all address learning, ad dress
table management, and aging
functions for up to 32,768 MAC
addresses (limited by external
memory) with an a ddre ss l ear nin g rate
of up to 10,000 addresses per second.

• Maximum broadcast/multicast rate of
14,880 packets per second per port
with configurable broa dc ast storm rate
limiting.

• Backpressure flow control with
configurable per-port buff er thresho lds
and limits.

• Expandable to 64 ports without loss in
throughput using multiple PM3350

devices via an on-chip 1 Gbit/s
expansion port.

• Expansion port supports a peak
system bandwidth of 1 Gbit/s, and is
compatible with industry-standard PCI
bus (version 2.1).

• Interfaces directly to industry-standard
10BaseT Ethernet Medium Access
Unit devices (LXT944 or similar) with
no glue logic.

• Configuration, management, MIB
statistics, and diagnostics available
in-band (via on-chip SNMP agent with
integral TCP/UDP/IP stack).

• Maintains and collects per-port and
per-host statistics at wire rates.

• Fully static CMOS operati on at 50 MHz
clock rates.

• Implemented with a 3.3 V core and a
5 V-compatib le I/O.

• Available in a 256-pin Ball Grid Array
(BGA) package.

BLOCK DIAGRAM

PCI Expansion

Bus

PCI Bus

Interface

Expansion

Registers

50 MHz
Embedded
RISC CPU

I

CacheD Cache

Multi-Channel

DMA

Controller

External

Memory

Interface

FIFO 10BaseT MAC

FIFO 10BaseT MAC

FIFO 10BaseT MAC

FIFO 10BaseT MAC

FIFO 10BaseT MAC

FIFO 10BaseT MAC

FIFO 10BaseT MAC

FIFO 10BaseT MAC

10BaseT

10BaseT

Quad Ethernet

Quad Ethernet

10BaseT

Interface Adapter

10BaseT

10BaseT

10BaseT

10BaseT

Interface Adapter

10BaseT

PMC-970277 (P4)

EDO DRAM/EPROM





1998 PMC-Sierra, Inc. October, 1998

Preliminary

PM3350 ELAN 8x10

8-Port 10 Mbit/s Switch

TYPICAL APPLICATIONS

LOW-COST 10 Mbit/s SWITCHES

The ELAN 8×10 chip can act as a stand-alone managed or unmanaged switching device in low-cost, compact switch applications.
Eight to sixty-four ports of 10BaseT switches can be built using the internal PCI expansion port. A typical system would use the
following:

• PM3350 (one for every eight ports),

• two 256k × 16-bit 60 ns EDO or Fast Page Mode DRAM chips per ELAN 8×10 chip,

• an EPROM or EEPROM (initialization, configuration, SNMP support firmware),

• quad Ethernet interface adapters (LXT944), and

• appropriate passive components.
A block diagram of a typical 8-port 10BaseT stackable sw itch is shown.

PCI Bus Expansion Bus

10BaseT
Ports 1-4

10BaseT
Ports 5-8

PM3350

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EDO DRAM EEPROM

Quad 10BaseT

Interface

Quad 10BaseT

Interface

LOW-COST 10/100 Mbit/s SWITCHES

The ELAN 8×10 chip can be part of a fully managed 10/100 switch using the PM3351 ELAN 1×100 10/100 Mbit/s switch chip.
Together they can form a workgroup or desktop application. A block diagram of a typical 32-port 10BaseT stackable switch with
two 10/100 Mbit/s ports is shown. The PCI expansion bus is used to seamlessly connect the ELAN 8×10s and ELAN 1×100s.

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DRAM

10/100BaseT

10/100 PHY

PM3351

SRAM

8×10BaseT

Quad

Quad

PHY

PHY

PM3350

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8×10BaseT

Quad

PHY

PM3350

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EDO

DRAM

PCI Backplane

Quad

PHY

EDO

Head Office:
PMC-Sierra, Inc.
#105 - 8555 Baxter Place
Burnaby, B.C. V5A 4V7
Canada
Tel: [phone]
Fax: [phone]

EEPROM

PM3350

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Quad

Quad

PHY

PHY

8×10BaseT

To order documentation,
send email to:
[e-mail]
or contact the head office,
Attn: Document Coordinator

EDO

DRAM

PM3350

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Quad

Quad

PHY

PHY

8×10BaseT

EDO

DRAM

All product documentation is available
on our web site at:
http://www.pmc-sierra.com
For corporate info rmation,
send email to:
[e-mail]

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10/100 PHY

10/100BaseT

PM3351

SRAM

PMC-970277 (P4)
 1998 PMC-Sierra, Inc.
October, 1998
SmartPath is a trademark
of PMC-Sierra, Inc.