PM5313 datasheet(96/646 Pages) PMC

96 / 646 page

PRODUCTION

PMC-Sierra, Inc.

PM5313 SPECTRA-622

DATASHEET

PMC-1981162

ISSUE 6

SONET/SDH PAYLOAD EXTRACTOR/ALIGNER FOR 622 MBIT/S

PROPRIETARY AND CONFIDENTIAL

Pin Name

Type

No.

Function

TPOHEN

Input

D14

The transmit path overhead insert enable signal

(TPOHEN) indicates the availability of a valid path

overhead byte on TPOH.

TPOHEN shall be set high during the most

significant bit of a TPOH byte to indicate valid data

on the TPOH input. This byte will be accepted for

transmission if TPOHRDY is also set high. If

TPOHRDY is set low, the byte is rejected and must

be re-presented at the next opportunity.

Accepted bytes sampled on the TPOH input are

inserted into the corresponding path overhead byte

positions (for the J1, C2, G1, F2, Z3, Z4, and Z5

bytes). The byte on TPOH is ignored when

TPOHEN is set low during the most significant bit

position. The TPOHEN input takes precedence

over TAD.

When the byte at the B3 or H4 byte position on

TPOH is accepted, it is used as an error mask to

modify the corresponding transmit B3 or H4 path

overhead byte, respectively. The accepted error

mask is XOR’ed with the corresponding B3 or H4

byte before it is transmitted.

TPOHEN is sampled on the rising edge of the

TPOHCLK.

PM5313 Datasheet(PDF) 96 Page - PMC-Sierra, Inc