PM5313 datasheet(86/646 Pages) PMC

86 / 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

TOH

Input

D24

The transmit overhead (TOH) bit serial input signal

contains either the received section orderwire (E1),

user channel (F1) line order wire (E2) or line APS

bytes (K1/K2) to be transmitted.

TOH is sampled on the rising edge of TOHCLK.

The TOH inputs take precedence over the TSOW,

TSUC or TLOW inputs and the TTOH and TTOHEN

inputs take precedence over TOH. By default the

TOH input will overwrite the TSOW input.

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.

TTOHCLK

Output

D25

The transmit transport overhead clock (TTOHCLK)

is used to clock in transport overhead (TTOH) to be

transmitted along with it’s enable (TTOHEN).

TTOHCLK is nominally a 20.736 MHz clock

generated by gapping a 25.92 MHz clock.

TTOHCLK has a 33% high duty cycle.

TTOHFP is updated on the falling edge of

TTOHCLK.

TTOH is updated on the falling edge of TTOHCLK.

TTOH

Input

E24

The transmit transport overhead (TTOH) bit serial

input signal contains the transport overhead bytes

(A1, A2, J0, Z0, B1, E1, F1, D1-D3, H1-H3, B2, K1,

K2, D4-D12, Z1/S1, Z2/M1, and E2) to be

transmitted and errors masks to be applied on the

B1, B2, H1 and H2 transmitted bytes.

TTOH is sampled on the rising edge of TTOHCLK.

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