PM7344 datasheet(46/293 Pages) PMC

46 / 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

RXPRTY

Tristate

Output

Receive Parity (RXPRTY). This signal indicates

the parity of the RDAT[7:0] bus. Odd or even

parity selection can be made using a register.

RXPRTY is updated on the rising edge of

RFCLK and is tristated when

RRDENB[4:1]/RRDMPHB is high.

RSOC

Tristate

Output

Receive Start of Cell (RSOC). This signal marks

the start of cell on the RDAT[7:0] bus. When

RSOC is high, the first octet of the cell is present

on the RDAT[7:0] stream. RSOC is updated on

the rising edge of RFCLK and is tristated when

RRDENB[4:1]/RRDMPHB is high.

RCA[4]

RCA[3]

RCA[2]

RCA[1]

Output

Receive Cell Available (RCA[4:1]). These output

signals indicate when a cell is available in the

receive FIFO for the corresponding port.

RCA[4:1] can be configured to be deasserted

when either zero or four bytes remain in the

FIFO. RCA[4:1] will thus transition low on the

rising edge of RFCLK after the 53rd or 48th byte

has been output.

TFCLK

Input

Transmit FIFO Write Clock (TFCLK). This signal

is used to write ATM cells to the four cell

transmit FIFOs. TFCLK cycles at a 25 MHz or

lower instantaneous rate. A complete 53 octet

cell must be written to the FIFO before being

inserted in the transmit stream. Idle/unassigned

cells are inserted when a complete cell is not

available.

TDAT[0]

TDAT[1]

TDAT[2]

TDAT[3]

TDAT[4]

TDAT[5]

TDAT[6]

TDAT[7]

Input

Transmit Cell Data Bus (TDAT[7:0]). This bus

carries the ATM cell octets that are written to the

selected transmit FIFO. TDAT[7:0] is sampled

on the rising edge of TFCLK and is considered

valid only when TWRENB[n]/TWRMPHB is

simultaneously asserted.

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