PM5345 datasheet(45/196 Pages) PMC

45 / 196 page

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

TTOHEN

Input

The transmit transport overhead insert enable

(TTOHEN) signal, together with internal

transport overhead data which is transmitted.

While TTOHEN is high, values sampled on the

TTOH input are inserted into the

corresponding transport overhead bit position

(for the A1, A2, C1, E1, F1, D1-D3, K1, K2,

H3, D4-D12, Z1, Z2, and E2 bytes). While

TTOHEN is low, default values are inserted

into these transport overhead bit positions. A

high level on TTOHEN during the B1, B2 or

H1-H2 bit positions enables an error mask.

While the error mask is enabled, a high level

on input TTOH causes the corresponding B1,

B2 or H1-H2 bit position to be inverted. A low

level on TTOH allows the corresponding bit

position to pass through the S/UNI

uncorrupted. TTOHEN is sampled on the

rising edge of TTOHCLK.

TTOHCLK

Output

The transmit transport overhead clock

(TTOHCLK) is nominally a 5.184 MHz clock

which provides timing for upstream circuitry

that sources the transport overhead stream,

TTOH. TTOHCLK is a gapped 6.48 MHz clock.

TTOHCLK is updated in the falling edge of

POCLK.

TTOHFP

Output

The transmit transport overhead frame position

(TTOHFP) signal may be used to locate the

individual transport overhead bits in the

transport overhead data stream, TTOH.

TTOHFP is logic one while bit 1 (the most

significant bit) of the first framing byte (A1) is

expected in the TTOH stream. TTOHFP is

updated on the falling edge of TTOHCLK.

PM5345 Datasheet(PDF) 45 Page - PMC-Sierra, Inc

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