PM5345 datasheet(41/196 Pages) PMC

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PM5345 S/UNI-155

DATA SHEET

PMC-930305

ISSUE 4

SATURN USER NETWORK INTERFACE

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Pin Name

Type

No.

Function

TCLK

I/O

The transmit clock (TCLK) provides timing for

S/UNI transmit function operation when the

byte serial interface is selected (TSER is tied

low). TCLK must be a 19.44 MHz, nominally

50% duty cycle clock. POCLK is a buffered

version of TCLK when byte serial interface is

selected.

When the 155 Mbit/s serial interface is

selected (TSER is tied high), TCLK becomes

an output and should not be driven.

TX_VCLK

The test vector clock (TX_VCLK) signal is used

during S/UNI production testing to verify

internal functionality.

TFP

Input

The active high transmit frame pulse (TFP)

signal is used to align the SONET/SDH

transport frame generated by the S/UNI device

to a system reference when the byte serial

interface is selected (TSER is low). TFP

should be brought high for a single TCLK

period every 2430 TCLK cycles or a multiple

thereof. TFP may be tied low if such

synchronization is not required. The offset

between an active TFP input and the resultant

FPOUT pulse is 24 TCLK periods. TFP is

sampled on the rising edge of TCLK.

TWRB

Input

The transmit write strobe (TWRB) is used to

write ATM cells to the four cell transmit FIFO.

When active, TWRB cycles at a 25 MHz or

lower instantaneous rate. A complete 53 octet

cell must be written to the FIFO before being

inserted in the STS-3c (STM-1) SPE.

Idle/unassigned cells are inserted when a

complete cell is not available. TDAT[15:0] and

TSOC are sampled on the rising edge of

TWRB.

PM5345 Datasheet(PDF) 41 Page - PMC-Sierra, Inc

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