TERIDIAN Semiconductor 78Q21x3-DB User Manual
78Q21x3-DB MicroPHY
M
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DESCRIPTION
The 78Q21x3-DB is a design example for a
10/100BASE-TX Mbit/second Fast Ethernet MII
Interface adaptor. A 78Q2123 or 78Q2133
MicroPHY transceiver from Teridian provides the
network physical interface and MII (Medium
Independent Interface) interface.
Teridian Semiconductor’s MicroPHY is an autosensing, auto-switching 10/100BASE-TX Fast
Ethernet transceiver with full duplex operation
capability. The device interfaces directly to the
IEEE-802.3u MII port. Full-featured MII
management functions are included along with an
extended register set. The MicroPHY five bit PHY
address is defaulted to 0x001. The MicroPHY
interfaces to CAT5 UTP cable via a 1:1 transformer.
The transceiver’s transmitter includes on-chip the
pulse shaper and low power line driver. The
receiver incorporates a sophisticated combination of
real-time adaptive equalization, an adaptive DC
offset adjustment circuit and baseline wander
correction. Smart squelch circuitry further improves
the receiver’s noise rejection. Full featured autonegotiation or parallel detect modes are supported.
The demo board requires operation with a +3.3V
power supply.
Design Kit contains:
√ MicroPHY MII Demo Board
√ Demo Board Parts List
√ P.C.B. Gerber Files
√ Demo Board schematic
√ MicroPHY Data Sheet
MII Evaluation Board
DEMO BOARD MANUAL
February 2006
10/100Base-TX Interface
RJ45 Pin Assignment
Pin
Signal Pin Signal
1 TX+ 5 N/C
2 TX- 6 RX3 RX+ 7 N/C
4 N/C 8 N/C
MII: Medium Independent Interface
Pin Assignment:
(40 Pin Male Subminiature D, 0.050)
Pin
Signal Pin Signal
1 +3.3V 21 +3.3V
2 MDIO 22 COMMON
3 MDC 23 COMMON
4 RXD3 24 COMMON
5 RXD2 25 COMMON
6 RXD1 26 COMMON
7 RXD0 27 COMMON
8 RXDV 28 COMMON
9 RXCLK 29 COMMON
10 RXER 30 COMMON
11 TXER 31 COMMON
12 TXCLK 32 COMMON
13 TXEN 33 COMMON
14 TXD0 34 COMMON
15 TXD1 35 COMMON
16 TXD2 36 COMMON
17 TXD3 37 COMMON
18 COL 38 COMMON
19 CRS 39 COMMON
20 +3.3V 40 +3.3V
Ordering Number Description
78Q21x3-DB
MicroPHY MII Demo Board
© 2006 Teridian Semiconductor Corporation, Proprietary and Confidential - 1 - Rev_2.2
78Q21x3-DB MicroPHY
DEMO BOARD MANUAL
MII Evaluation Board
TM
MII ADAPTOR WITH MICROPHY
Use With the Netcom Smart-Bits
The Netcom expects to be the master and defaults to 100BASE-TX Half-Duplex operation. Fast-Ether Windows
may require the reconfiguration of the MicroPHY’s control register MR0 bits for similar operation. The MicroPHY
defaults to auto-negotiate with full capabilities.
After initialization the MicroPHY defaults to 100BASE-TX Full-Duplex operation. When connected to another fully
capable transceiver the transceivers will be in full-duplex mode. The default configuration of the Netcom is
100BASE-TX Half-Duplex operation. If data transfers were to commence, the Netcom would display Collision
errors (because it does not automatically read the transceivers and reconfigure).
The default MII PHY address for the MicroPHY is 0x001. Additionally, the MicroPHY will respond to the
broadcast address 0x000.
If a transceiver is used which defaults to 100BASE-TX Half-Duplex operation, the MicroPHY will adjust itself for
half-duplex operation (assuming the MicroPHY is setup for the proper technologies).
To establish proper operation between the MicroPHY and the Netcom, click on the “Options” button followed by
selecting “Full Duplex MII”. Repeat selecting “Full Duplex MII” twice to ensure that everything is configured
identically.
The MicroPHY can be configured for half-duplex operation to minimize incompatibilities with other transceivers
and the Netcom.
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© 2006 Teridian Semiconductor Corporation, Proprietary and Confidential - 2 - Rev_2.2
78Q21x3-DB MicroPHY
DEMO BOARD MANUAL
MII Evaluation Board
TM
10/100Mbps Transformer Selection
The line interface for the MicroPHY requires a pair of 1:1 isolation transformers. Integrated common-mode
chokes are recommended for satisfying FCC radiated EMI requirements. Additional filtering is not required with
the MicroPHY due to internal waveform shaping circuitry. The line transformer characteristics are outlined below:
Name Value Condition
Turns Ratio 1 CT : 1 CT
Open-Circuit Inductance 350 µH (min)
See Note 1.
Leakage Inductance 0.40 µH (max) @ 1 MHz (min)
Inter-Winding Capacitance 25 pF (max)
D.C. Resistance 0.9 ohm (max)
Insertion Loss 1.1 dB (typ) 0 - 100 MHz
HIPOT 1500 Vrms
Note 1: The receive line transformer’s Open-Circuit Inductance can be as low as 100 µH for the MicroPHY. The
MicroPHY incorporates baseline wander correction circuitry, which allows the receiver to track the incoming data
signal when there is excessive transformer droop.
For Commercial Temperature (0°C ~ 70°C)
Teridian Semiconductor has performed line testing with the following transformers and found their performance
acceptable with the MicroPHY:
Manufacturer
Part Number
TDK TLA-6T103
Bel-Fuse S558-5999-46
Halo TG22-3506ND
Pulse PE-68515
Valor ST6118
YCL 20PMT04
The following transformers are low profile packages (0.100 in/2.5 mm or less).
TDK TLA-6T118
Halo TG110-S050
PCA EPF8023G
The following devices integrate the transformers with the RJ45 connector.
TDK TLA-6T704
Delta RJS-1A08T089A
The following devices integrate the transformers, RJ45 connector, LEDs and termination resistors.
Pulse J0011D21B/E
The above evaluations were performed using Netcom’s Smart-Bits Fast Ethernet Analyzer. The Teridian
Semiconductor MicroPHY MII Adapter and Lancast Fast Ethernet Adapter were attached to the Netcom’s Ports A
& B respectively. Twisted pair Category 5 General Cable P/N 459360 was used to connect the two transceivers.
100 Mbps performance was measured using cable lengths of both 12 inches and 115 meters. 10 Mbps
performance was evaluated using 100 meters of Category 3 cable.
The Netcom was configured to use the Baseline Wander Packet file. Packet length was 1500 bytes.
All transformers listed above met or exceeded IEEE’s 802.3 Bit Error Rate requirements of 10
@ 10 mV, 10 kHz
-8
.
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© 2006 Teridian Semiconductor Corporation, Proprietary and Confidential - 3 - Rev_2.2
78Q21x3-DB MicroPHY
DEMO BOARD MANUAL
MII Evaluation Board
TM
For Industrial Temperature (-40°C ~ +85°C)
Now most of the transformer vendors also offer industrial temp transformer, which will work with the 78Q2133.
Here is the recommended industrial temp transformer list:
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Manufacturer
Belfuse S558-5999-U5
Pulse HX1148
Halo TG110-E050N5
Part Number
© 2006 Teridian Semiconductor Corporation, Proprietary and Confidential - 4 - Rev_2.2
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