PM5347 datasheet(48/302 Pages) PMC

48 / 302 page

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

TPOH

Input

The transmit path overhead data (TPOH) signal

contains the path overhead bytes (J1, C2, G1, F2,

H4, Z3, Z4, and Z5) and error masks (B3) which

may be inserted, or used to insert path BIP-8

errors into the path overhead byte positions in the

transmit stream. Insertion is controlled by the

TPOHEN input, or by bits in internal registers.

TPOH is sampled on the rising edge of

TPOHCLK.

TPOHEN

Input

The transmit path overhead insert enable

(TPOHEN) signal, together with internal register

bits, controls the source of the path overhead data

which is transmitted. While TPOHEN is high,

values sampled on the TPOH input are inserted

into the corresponding path overhead bit position

(for the J1, C2, G1, H4, F2, Z3, Z4, and Z5 bytes).

While TPOHEN is low, values obtained from

internal registers are inserted into these path

overhead bit positions. A high level on TPOHEN

during the B3 bit positions enables an error mask.

While the error mask is enabled, a high level on

input TPOH causes the corresponding B3 bit

position to be inverted. A low level on TPOH

allows the corresponding bit position to pass

through the S/UNI-PLUS uncorrupted. TPOHEN

is sampled on the rising edge of TPOHCLK.

TPOHCLK

Output

The transmit path overhead clock (TPOHCLK) is

nominally a 576 kHz clock which provides timing

for circuitry that sources the path overhead

stream, TPOH. TPOHCLK is a gapped 810 KHz

clock. TPOHCLK is updated in the falling edge of

GTOCLK.

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