PM5313 datasheet(97/646 Pages) PMC

97 / 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

TPOHRDY

Output

B14

The transmit path overhead insert ready signal

(TPOHRDY) indicates whether the SPECTRA-622

is ready to accept the byte currently on TPOH.

TPOHRDY is set high during the most significant

bit of a TPOH byte to indicate readiness to accept

the byte on the TPOH input. This byte will be

accepted if TPOHEN is also set high. If TPOHEN is

set low, the byte is invalid and is ignored.

TPOHRDY is set low to indicate that the

SPECTRA-622 is unable to accept the byte on

TPOH, and expects the byte to be re-presented at

the next opportunity.

Accepted bytes sampled on the TPOH input are

inserted or masked into the corresponding path

overhead byte positions (for the J1, B3, C2, G1,

F2, H4, Z3, Z4, and Z5 bytes).

TPOHRDY is updated on the rising edge of the

TPOHCLK.

TAD

Input

E25

The transmit alarm port data signal (TAD) contains

the path REI count and the path RDI status of the

twelve receive STS-1 (STM-0/AU3) streams or four

STS-3/3c (STM-1/AU3/AU4) streams or the single

STS-12c (STM-4-4c) stream. In addition, the TAD

input can contain the K1 and K2 bytes. TTOHEN

takes precedence over TAD.

TAD is sampled on the rising edge of TACK.

TAFP

Input

C26

The transmit alarm port frame pulse signal (TAFP)

marks the first bit of the transmit alarm message in

each SONET/SDH frame. TAFP is pulsed high to

mark the first path REI bit location of the first

STS-1 (STM-0/AU3) stream or the first path REI bit

location of the first STS-3c (STM-1/AU4) stream or

the first path REI bit location of the single STS-12c

(STM-4-4c) stream.

TAFP is sampled on the rising edge of TACK.

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