PM5316 datasheet(43/491 Pages) PMC

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SONET/SDH Payload Extractor/Aligner (SPECTRA-4x155)

Production

Proprietary and Confidential to PMC-Sierra, Inc. and for its customers’ internal use

Document ID: PMC-1990822, Issue 4

Pin Name

Type

No.

Function

RTOHFP1

RTOHFP2

RTOHFP3

RTOHFP4

Output

AH7

AG9

AJ10

AJ12

The receive transport overhead frame position (RTOHFP1-4) signal

is used to locate the most significant bit (MSB) on the RTOH1-4

serial stream.

RTOHFP1-4 is set high when bit 1 (the most significant bit) of the

first framing byte (A1) is present in the RTOH1-4 stream.

RTOHFP1-4 can also be sampled on the rising edge of RSLDCLK1-

4 to locate the MSB of the RSLD1-4 serial output stream. The

generation of this clock is aligned with the generation of RTOHFP1-

RTOHFP1-4 is updated on the falling edge of RTOHCLK1-4.

RPOHCLK

Output

A27

The receive path overhead clock (RPOHCLK1-4) provides timing to

process the B3E signal, receive alarm port (RAD), path Z5 growth

byte (tandem path incoming error count and data link), and to sample

the extracted path overhead of the four STS-3/3c (STM-1/AU-3/AU-

4) streams. RPOHCLK is a nominally 12.96 MHz, 50% duty cycle

clock.

RTCEN and RTCOH are sampled on the rising edge of the

RPOHCLK signal.

B3E, RAD, RALM, RPOH, RPOHEN and RPOHFP are updated on

the falling edge of the RPOHCLK signal.

RPOHFP

Output

C26

The receive path overhead frame position signal (RPOHFP) may be

used to locate the individual path overhead bits in the path overhead

data stream (RPOH). RPOHFP signal is logic one when bit 1 (the

most significant bit) of the path trace byte (J1) of channel one’s first

STS-1 (STM-0/AU-3) or STS-3c (STM-1/AU-4) is present in the

RPOH stream.

RPOHFP may also be used to locate the BIP error count and path

RDI indication bits on the receive alarm port data signal (RAD).

RPOHFP is logic one when the first of eight BIP error positions of

channel one’s first STS-1 (STM-0/AU-3) or STS-3c (STM-1/AU-4)

stream is present on the receive alarm data signal (RAD).

RPOHFP is also used to help find the alignment of the B3E output

and RTCEN/RTCOH inputs.

RPOHFP signal is updated on the falling edge of the RPOHCLK

signal.

RPOH

Output

E25

The receive path overhead data signal (RPOH) contains the path

overhead bytes (J1, B3, C2, G1, F2, H4, Z3, Z4, and Z5) extracted

from the path overhead of the three STS-1 (STM-0/AU-3) streams or

STS-3c (STM-1/AU-4) streams in all four channels. The

corresponding RPOHEN signal is set high to identify the valid

overhead bytes that are presented.

RPOH is updated on the falling edge of RPOHCLK.

RPOHEN

Output

B26

The receive path overhead enable signal (RPOHEN) indicates the

validity of the path overhead bytes extracted to the RPOH from the

path overhead of the three STS-1 (STM-0/AU-3) streams or STS-3c

(STM-1/AU-4) streams in all four channels. When RPOHEN signal is

set high, the corresponding path overhead byte presented on the

RPOH is valid. When RPOHEN is set low, the corresponding path

overhead byte presented on the RPOH is invalid. RPOHEN also

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