PM5342 datasheet(79/558 Pages) PMC

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PM5342 SPECTRA-155

DATA SHEET

PMC-970133

ISSUE 4

SONET/SDH PAYLOAD EXTRACTOR/ALIGNER

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

Pin Name

Type

No.

Function

TPOHEN[3]

TPOHEN[2]

TPOHEN[1]

Input

The transmit path overhead insert enable

signals (TPOHEN[3:1]), together with internal

overhead data which is inserted in the

transmit stream. While TPOHEN is high,

values sampled on the TPOH input are

inserted into the corresponding path overhead

bit position (for the J1, C2, G1, F2, Z3, Z4,

and Z5 bytes). While TPOHEN is low, values

obtained from internal registers are inserted

into these path overhead bit positions. The

TPOHEN input take precedence over TOH.

A high level on TPOHEN during the B3 or H4

bit positions enables an error mask. While

the error mask is enabled, a high level on

input TPOH causes the corresponding B3 or

H4 bit position to be inverted. A low level on

TPOH allows the corresponding bit position to

pass through the SPECTRA-155 uncorrupted.

In STS-3c (STM-1/AU4) mode or STS-1

(STM-0/AU3) mode, only TPOHEN[1] is

significant. Each TPOHEN input is sampled

on the rising edge of the corresponding

TPOHCLK output.

TPOHCLK[3]

TPOHCLK[2]

TPOHCLK[1]

Output B4

The transmit path overhead clocks

(TPOHCLK[3:1]) provide timing to update the

corresponding path overhead stream, TPOH.

In STS-3c (STM-1/AU4) mode or STS-1

(STM-0/AU3) mode, TPOHCLK[1] is a

576kHz clock and TPOHCLK[3:2] are inactive.

TPOH and TPOHEN are sampled on the

rising edge of the corresponding TPOHCLK.

PM5342 Datasheet(PDF) 79 Page - PMC-Sierra, Inc

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