PM5347 datasheet(79/302 Pages) PMC

79 / 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

1001, I-bits and D-bits set to all ones, and unused bits set to all zeros) is inserted

in the second and third pointer byte locations in the transmit stream.

1. A "normal pointer value" locates the start of the SPE. Note: 0

≤ "normal

pointer value"

≤ 782, and the new data flag (NDF) field is set to 0110. Note

that values greater than 782 may be inserted, using internal registers, to

generate a loss of pointer alarm in downstream circuitry.

2. Arbitrary "pointer values" may be generated using internal registers. These

new values may optionally be accompanied by a programmable new data

flag. New data flags may also be generated independently using internal

registers.

3. Positive pointer movements may be generated using a bit in an internal

of the pointer word. The SPE is not inserted during the positive stuff

opportunity byte position, and the pointer value is incremented by one.

Positive pointer movements may be inserted once per frame for diagnostic

purposes.

4. Negative pointer movements may be generated using a bit in an internal

bits of the pointer word. The SPE is inserted during the negative stuff

opportunity byte position , the H3 byte, and the pointer value is decremented

by one. Negative pointer movements may be inserted once per frame for

diagnostic purposes.

The pointer value is used to insert the path overhead into the transmit stream.

The current pointer value may be read via internal registers.

BIP-8 Calculate

The BIP-8 Calculate Block performs a path bit interleaved parity calculation on

the SPE of the transmit stream. Details are provided in the references. The

resulting parity byte is inserted in the path BIP-8 (B3) byte position of the

subsequent frame. BIP-8 errors may be continuously inserted under register

control for diagnostic purposes.

FEBE Calculate

The FEBE Calculate Block accumulates far end block errors on a per frame

basis, and inserts the accumulated value (up to maximum value of eight) in the

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