PM7346 datasheet(64/419 Pages) PMC

64 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 43

Pin Name

Type

Pin No.

Function

TENB

Input

H18

Transmit Multi-Phy Write Enable (TENB).

The TENB signal is an active low input

which is used along with the TADR[4:0]

inputs to initiate writes to the transmit

FIFOs. When sampled low using the rising

edge of TFCLK, the word on the TDAT bus

is written into the transmit FIFO selected

by the TADR[4:0] address bus. When

sampled high using the rising edge of

TFCLK, no write is performed, but the

TADR[4:0] address is latched to identify

the transmit FIFO to be accessed. A

complete 53 octet cell must be written to

the transmit FIFO before it is inserted into

the transmit stream. Idle cells are inserted

when a complete cell is not available.

TADR[4]

TADR[3]

TADR[2]

TADR[1]

TADR[0]

Input

F18

F19

F20

G18

H17

Transmit Address (TADR[4:0]). The

TADR[4:0] bus is used to select the FIFO

(and hence port) that is written to using

the TENB signal and the FIFO whose cell-

available signal is visible on the TCA

output. TADR[4:0] is sampled on the rising

edge of TFCLK together with TENB.

Note that the null-PHY address 1FH is an

invalid address and will not be identified to

any port on the S/UNI-QJET.

PM7346 Datasheet(PDF) 64 Page - PMC-Sierra, Inc

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