PM7375-SC datasheet(34/430 Pages) PMC

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PM7375 LASAR-155

DATA SHEET

PMC-931127

ISSUE 6

LOCAL ATM SAR & PHYSICAL LAYER

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

RRDENB

Output

108

The active low receive read enable (RRDENB) signal's

function is configured using input RXPHYBP.

When RXPHYBP is set high, the LASAR-155's

SONET physical layer blocks are bypassed and

RRDENB is used to initiate reads from an external

FIFO associated with a physical layer device (eg. the

PMC SUNI-PDH device). When RRDENB is set low

and RFIFOEB is sampled high on a rising edge of

SYSCLK, a cell byte is sampled on the RDAT[7:0] bus

on the next rising edge of SYSCLK. If RRDENB is set

high on the rising edge of SYSCLK, a cell byte is not

sampled on the next rising edge of SYSCLK.

RRDENB is updated on the rising edge of SYSCLK.

When RXPHYBP is set low, the LASAR-155 operates

normally with the integrated STS-3c (STM-1) or STS-1

PHY. When RRDENB is set low on the rising edge of

SYSCLK, the data on the RDAT[7:0] bus is valid. When

RRDENB is set high on the rising edge of SYSCLK,

the data on the RDAT[7:0] bus is not valid. RRDENB

is updated on the rising edge of SYSCLK.

RSOC

I/O

107

The receive start of cell (RSOC) signal's function is

configured using input RXPHYBP.

When RXPHYBP is set high, RSOC becomes an input

and is expected to mark the start of cell on the

RDAT[7:0] bus. For this mode of operation, RSOC is

sampled using the rising edge of SYSCLK.

When RXPHYBP is set low, RSOC becomes an output

and marks the start of cell on the RDAT[7:0] bus. For

this mode of operation, RSOC is updated on the rising

edge of SYSCLK.

PM7375-SC Datasheet(PDF) 34 Page - PMC-Sierra, Inc

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