PM5313 datasheet(85/646 Pages) PMC

85 / 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

TOHCLK

Tristate

Output

A25

The transmit overhead clock (TOHCLK) is used to

clock in the transmit overhead (TOH). A smooth or

gapped version of this clock may be selected.

When selecting the smooth clock and clocking the

section orderwire (E1), user channel (F1) or line

order wire (E2), TOHCLK is a 64 kHz clock with

nominal 50% duty cycle. When selecting to clock

the line APS bytes (K1/K2), TOHCLK is a 128 kHz

clock with nominal 50% duty cycle.

When selecting the gapped clock and clocking the

section orderwire (E1), user channel (F1) or line

order wire (E2), TOHCLK is a 64 kHz clock

generated by gapping a 72 kHz clock. When

selecting to clock the line APS bytes (K1/K2),

TOHCLK is a 128 kHz clock generated by gapping

a 144 kHz clock.

In all cases, TOH is sampled on the rising edge of

TOHCLK. In gapped clock mode, a gap detector on

TOHCLK is needed to identify the MSB on TOH. An

edge detection on TFP may also be used. In

smooth clock mode, TTOHFP may be used to

identify the rising edge when the MSB should be

present on TOH.

The TTOC Overhead Control register contains the

TOHSEL[1:0] register bits used to select the section

orderwire, section user channel, line orderwire or

line APS bytes. The same register also contains the

TX_GAPSEL register bit used to select the smooth

or gapped TOHCLK output clock and the TOH_TS

TOHCLK output.

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