PM5342 datasheet(61/558 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

ROH

Tristate

Output

P18

The receive overhead (ROH) output can be

selected to carry either the section orderwire

(E1), the line orderwire (E2), the line user

channel (F1) or the automatic protection switch

channel (K1, K2). Selection is made using the

ROHSEL bits in the SPECTRA-155 Receive

Overhead Output Control register.

ROH can be tristate using the TRIS_OHB input

and the ROH_TS bit in the SPECTRA-155

Receive Overhead Output Control register. On

reset, ROH will be tristate if TRIS_OHB is low.

ROH is updated on the falling edge of

ROHCLK.

RTOHCLK

Output

U18

The receive transport overhead clock

(RTOHCLK) is nominally a 5.184 MHz or 1.728

MHz clock that provides timing to process the

extracted receive transport overhead, RTOH.

RTOHCLK is a gapped 6.48 MHz clock when

accessing the transport overhead of an

STS-3/3c (STM-1/AU3/AU4) stream.

RTOHCLK is a gapped 2.16 MHz clock when

accessing the transport overhead of an STS-1

(STM-0/AU3) stream.

RTOH

Output

V17

The receive transport overhead (RTOH) signal

contains the receive transport overhead bytes

(A1, A2, J0, Z0, B1, E1, F1, D1-D3, H1-H3, B2,

K1, K2, D4-D12, Z1/S1, Z2/M1, and E2)

extracted from the incoming stream. RTOH is

updated on the falling edge of RTOHCLK.

RTOHFP

Output

T17

The receive transport overhead frame position

(RTOHFP) signal is used to locate the individual

receive transport overhead bits in the receive

transport overhead, RTOH. RTOHFP is set

high while bit 1 (the most significant bit) of the

first framing byte (A1) is present in the RTOH

stream. RTOHFP is updated on the falling edge

of RTOHCLK.

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