PM5356 datasheet(69/307 Pages) PMC

69 / 307 page

RELEASED

S/UNI-622-MAX

PMC-Sierra, Inc.

PM5356

S/UNI-622-MAX

DATASHEET

PMC-1980589

ISSUE 6

SATURN USER NETWORK INTERFACE (622-MAX)

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Pointer Generator

The Pointer Generator Block generates the outgoing payload pointer (H1, H2) as

specified in the references. The concatenation indication (the NDF field set to

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

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

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

FEBE bit positions of the path status (G1) byte. The FEBE information is derived

from path BIP-8 errors detected by the receive path overhead processor, RPOP.

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