t71l6808a TM Technology Inc., t71l6808a Datasheet - Page 4

• Manufacturer Part Number: t71l6808a
• Description: Octal 10/100 Switch With Embedded Memory
• Manufacturer: TM Technology Inc.

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Preliminary T71L6808A
Block Diagram
Functional Description
Reset
After power on reset, the T71L6808A will determine some features from ENFCTRL and
ENBKPRS pins, auto-load the content of 24LC02 serial EEPROM, and write abilities to
connected PHY management registers via MDC/MDIO.
RMII Interface
The T71L6808A provides 10/100 Mbps low pin count RMII interface for use between PHY and
T71L6808A. The RMII is capable of supporting 10Mbps and 100Mbps data rates. A single clock
reference, 50MHz, sourced from an external clock input is used for receive and transmit. It also
provides independent 2 bit wide (di-bit) transmit and receive data paths. As the REFCLK is 10
times the data rate in 10Mbps mode each data di-bit must be output on TXD[1:0] and input on
RXD[1:0] for ten consecutive REFCLK cycles.
Taiwan Memory Technology, Inc. reserves the right
P. 4
Publication Date:May. 2001
to change products or specifications without notice.
Revision:0.A