PM5313 datasheet(89/646 Pages) PMC

89 / 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

TTOHREI

Input

A23

The transmit transport overhead REI (TTOHREI)

serial input signal contains the REI count to be

transmitted into the M1 byte. TTOHREI is sampled

on the rising edge of TTOHCLK and increments an

8 bit counter for each TTOHREI sampled high. On

the TTOHCLK rising edge identified by TTOHFP,

the counter’s value is transferred into a holding

TTOHREI is sampled high during the cycle. This

ensures that all TTOHREI pulses will be counted.

The transferred count value is inserted into M1

byte.

This input can be used when multiple SPECTRA-

622’s are configured to process a demultiplexed

STS-48(STM16) stream.

TTOHREI is sampled on the rising edge of

TTOHCLK. The TTOH and TTOHEN inputs take

precedence over TTOHREI.

10.7 Receive Path Status and Overhead Signal

Pin Name

Type

No.

Function

RPOHCLK

Output

E15

The receive path overhead clock (RPOHCLK)

provides timing to process the B3E signal, the

receive alarm port (RAD) and to sample the

extracted path overhead for the twelve STS-1

(STM-0/AU3) streams or the four STS-3/3c (STM-

1/AU3/AU4) streams or the single STS-12c (STM-

4-4c) stream. RPOHCLK is a nominally 12.96

MHz, 50% duty cycle clock.

B3E, RALM, RPOH and RPOHFP are updated on

the falling edge of the RPOHCLK signal.

RAD is updated on the falling edge of RPOHCLK.

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