PM5356 datasheet(40/307 Pages) PMC

40 / 307 page

RELEASED

S/UNI-622-MAX

PMC-Sierra, Inc.

PM5356

S/UNI-622-MAX

DATASHEET

PMC-1980589

ISSUE 6

SATURN USER NETWORK INTERFACE (622-MAX)

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

Pin Name

Type

No.

Function

RENB

Input

N23

The UTOPIA receive read enable (RENB) is used to

initiate reads from the receive FIFO. The system may

de-assert RENB if it is unable to accept more data.

In 16-bit Level 2 ATM mode, a read is not performed

and RDAT[15:0], RPRTY and RSOC will tristate when

RENB is sampled high. When RENB is sampled low,

the word on the RDAT[15:0] bus is read from the

receive FIFO and changes to the next value on the

next clock cycle.

In 8-bit Level 3 ATM mode, a read is not performed

and RDAT[7:0] does not change when RENB is

sampled high. When RENB is sampled low, the word

on the RDAT[7:0] bus is read from the receive FIFO

and changes to the next value on the next clock

cycle.

RENB is sampled on the rising edge of RFCLK.

RCA

Output

N20

The UTOPIA receive cell available (RCA) provides

direct status indication of when a cell is available in

the receive FIFO.

In 16-bit Level 2 mode, RCA can be configured to de-

assert when either zero or four bytes remain in the

FIFO. RCA will thus transition low on the rising edge

of RFCLK after payload word 24 or 19 is output on

the RDAT[15:0] bus depending on the RXCP

registers.

In 8-bit Level 3 mode, RCA is ignored as the RVAL

signal identifies valid data on the RDAT[7:0] bus.

RCA is updated on the rising edge of RFCLK.

PM5356 Datasheet(PDF) 40 Page - PMC-Sierra, Inc

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