PM5347 datasheet(80/302 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

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.

Far end block errors may be inserted under register control for diagnostic

purposes.

9.15

Path Overhead Insert

The Path Overhead Insert Port allows the complete path overhead to be inserted

using input TPOH, along with the path overhead clock, TPOHCLK, and the path

overhead frame position, TPOHFP. The path overhead clock, TPOHCLK, is

nominally a 576 kHz clock. The state of the TPOHEN input, together with an

internal register, determines whether the data sampled on TPOH, or the default

path overhead byte values (shown in Figure 9) are inserted in the transmit

stream. For example, a high level on TPOHEN during the path signal label (C2)

bit positions causes the eight values shifted in on TPOH to be inserted in the C2

byte position in the transmit stream. A low level on TPOHEN during the path

signal label bit positions causes the default value (0x13) to be inserted in the

transmit stream.

During the B3 byte position in the TPOH stream, a high level on TPOHEN

enables an error insertion mask. While the error mask is enabled, a high level on

input TPOH causes the corresponding bit in the B3 byte to be inverted. A low

level on TPOH causes the corresponding bit in the B3 byte to be transmitted

uncorrupted.

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