PM5313 datasheet(79/646 Pages) PMC

79 / 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

ROH

Tristate

Output

E20

The receive overhead (ROH) bit serial output signal

contains either the received section orderwire (E1),

user channel (F1) line order wire (E2) or line APS

bytes (K1/K2).

ROH is updated on the falling edge of ROHCLK

and should be sampled externally on the rising

edge of ROHCLK.

The RTOC Overhead Control register contains the

ROHSEL[1:0] register bits used to select the

section orderwire, section user channel, line

orderwire or line APS bytes. The same register also

contains the RX_GAPSEL register bit used to select

the smooth or gapped ROHCLK output clock and

the ROH_TS register bit that can be used to tri-

state ROHCLK and ROH outputs.

RTOHCLK

Output

A22

The receive transport overhead clock (RTOHCLK)

is used to update the received transport overhead

outputs (RTOH and RTOHFP).

RTOHCLK is nominally a 20.736 MHz clock

generated by gapping a 25.92 MHz clock.

RTOHCLK has a 33% high duty cycle.

RTOHFP and RTOH are updated on the falling

edge of RTOHCLK.

RTOH

Output

C21

The receive transport overhead (RTOH) bit serial

output signal contains the received 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)

from the incoming stream.

RTOH is updated on the falling edge of RTOHCLK

and should be sampled externally on the rising

edge of RTOHCLK.

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