PM5347 datasheet(47/302 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

TTOHEN

Input

The transmit transport overhead insert enable

(TTOHEN) signal, together with internal register

bits, controls the source of the 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, J0/Z0, E1, F1, D1-D3, K1,

K2, H3, D4-D12, S1/Z1, M0 or M1/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-PLUS 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

(STS-3c/STM-1) or a 1.728 MHz clock (STS-1)

clock which provides timing for circuitry that

sources the transport overhead stream, TTOH.

When STS-3c (STM-1) mode is selected,

TTOHCLK is a gapped 6.48 MHz clock. When

STS-1 mode is selected, TTOHCLK is a gapped

2.16 MHz clock. TTOHCLK is updated in the

rising edge of GTOCLK.

TTOHFP

Output

The transmit transport overhead frame position

(TTOHFP) signal is used to locate the individual

transport overhead bits in the transport overhead

input, TTOH. TTOHFP is set high while bit 1 (the

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

expected on TTOH. TTOHFP is updated on the

falling edge of TTOHCLK.

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