PM5313 datasheet(60/646 Pages) PMC

60 / 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

TDCK

Input

AL10

The parallel transmit data clock (TDCK) provides

timing for SPECTRA-622 transmit function

operation when the device is configured for the

parallel interface mode of operation only. When

both the serial and parallel interfaces are enabled,

the parallel input clock is ignored.

TDCK is a 77.76 MHz nominally 50% duty cycle

clock.

TFPI

Input

AG10 The transmit frame pulse input is an active high

pulse identifying the first synchronous payload

envelope byte in the STS-12 (STM-4) frame on

TD[7:0] bus or TXD+/- outputs. Selection of whether

TFPI indicates framing position on the TD[7:0] or

the TXD+/- is controlled by the TX_LIFSEL[1:0] bits

in the SPECTRA-622 Line Configuration #1

position on the TD[7:0] bus. If TX_LIFSEL[1:0] is

00b or 11b, TFPI indicates framing position on the

TXD+/- outputs.

TFPI should be set high for a single TCLK period

every 9720 TCLK cycles. It is not necessary for

TFPI to be present at every frame, an internal

counter fly-wheels based on the most recent TFPI

received. TFPI may be set low if such

synchronization is not required.

TFPI is sampled on the rising edge of TCLK.

TD[0]

TD[1]

TD[2]

TD[3]

TD[4]

TD[5]

TD[6]

TD[7]

Output

AK8

AL8

AH9

AJ9

AK9

AL9

AH10

AJ10

The parallel transmit data (TD[7:0]) bus carries the

STS-12 (STM-4) SONET/SDH transmit stream in

byte serial format. TD[7] is the most significant bit

(corresponding to bit 1 of each serial word, the first

bit transmitted). TD[0] is the least significant bit

(corresponding to bit 8 of each serial word, the last

bit transmitted).

TD[7:0] is updated on the rising edge of TCLK.

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