PM7344 datasheet(47/293 Pages) PMC

47 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

Pin Name

Type

No.

Function

TXPRTY

Input

Transmit bus parity (TXPRTY). This signal

indicates the parity of the TDAT[7:0] bus. Odd or

even parity selection can be made using a

of TFCLK and is considered valid only when

TWRENB[n]/TWRMPHB is simultaneously

asserted.

A parity error is indicated by a status bit and a

maskable interrupt. Cells with parity errors are

inserted in the transmit stream, so the TXPRTY

input may be unused.

TWRMPHB

Input

Transmit Multi-Phy Write Enable (TWRMPHB).

The TWRMPHB signal is available on this pin

when input MPHEN is high. This active low

input is used to initiate writes to the transmit

FIFOs. When sampled low using the rising

edge of TFCLK, the byte on TDAT[7:0] is written

into the transmit FIFO selected by the TWA[1:0]

address bus. When sampled high using the

rising edge of TFCLK, no write is performed. A

complete 53 octet cell must be written to the

transmit FIFO before it is inserted into the

transmit stream. Idle/unassigned cells are

inserted when a complete cell is not available.

TWRENB[1

]

Transmit Write Enable PHY #1 (TWRENB[1]).

The TWRENB[1] signal is available on this pin

when input MPHEN is low. TWRENB[1] is used

to initiate writes to the transmit FIFO of PHY #1.

When sampled low using the rising edge of

TFCLK (and the remaining three TWRENBs

remain high), a byte is written to PHY #1's

synchronous FIFO. When sampled high using

the rising edge of TFCLK, no write is performed.

TWRENB[1] must operate in conjunction with

TFCLK to access the FIFOs at a high enough

instantaneous rate as to avoid FIFO overflows.

The ATM layer device may deassert

TWRENB[1] at anytime it is unable to provide

another byte.

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