PM5347 datasheet(33/302 Pages) PMC

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PM5347 S/UNI-PLUS

DATA SHEET

PMC-941033

ISSUE 6

SATURN USER NETWORK INTERFACE PLUS

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

Pin Name

Type

No.

Function

TFP

Input

The active high transmit frame pulse (TFP) signal

is used to align the SONET/SDH transport frame

generated by the S/UNI-PLUS device to a system

reference. TFP should be brought high for a

single GTOCLK period every 810 (STS-1), or

2430 (STS-3c/STM-1) GTOCLK 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

frame alignment on TOHFP is 16 GTOCLK

periods in STS-1 mode and 24 GTOCLK periods

in STS-3c mode. TFP is sampled on the rising

edge of GTOCLK.

GTOCLK

Output

The generated transmit output clock (GTOCLK) is

nominally a 6.48 MHz or 19.44 MHz, 50% duty

cycle clock. Transmit inputs and outputs that are

timed from the line are updated with timing

aligned to GTOCLK.

When configured for transmit clock synthesis

(TBYP low), GTOCLK is the synthesized line clock

divided by 8.

When transmit clock synthesis is bypassed (TBYP

high), GTOCLK is equal to TRCLK+/- divided by 8.

TOHFP

Output

The transmit overhead frame pulse (TOHFP)

signal identifies the start of a byte on outputs

TSOW, TSUC and TLOW. If required, TOHFP is

one GTOCLK clock cycle wide and can be used

as a reset pulse for an external counter. Please

refer to the functional timing diagrams for details.

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