PM5344 datasheet(55/212 Pages) PMC

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PM5344 SPTX

DATA SHEET

PMC-930531

ISSUE 6

SONET/SDH PATH TERMINATING TRANSCEIVER

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

path AIS is immediately inserted on detection of ISF and removed on detection

of inactive ISF code.

9.6

Transmit Path Trace Buffer

The transmit portion of the SONET Path Trace Buffer (SPTB) sources the path

trace identifier message (J1) for the Transmit Overhead Processor block. The

length of the trace message is selectable between 16 bytes and 64 bytes. The

SPTB contains one page of transmit trace identifier message memory. Identifier

message data bytes are written by the microprocessor into the message buffer

and delivered serially to the Transmit Overhead Processor block for insertion in

the transmit stream. When the microprocessor is updating the transmit page

buffer, SPTB may be programmed to transmit null characters to prevent

transmission of partial messages.

9.7

Telecombus Interface

The Telecombus Interface block converts signals defined in the Telecombus

standard to those useable by TSBs. It performs multiplexing and demultiplexing

functions in STS-3 (AU3) mode to deliver and collect data at STS-1 rate from the

three Receive Telecombus Aligner and Transmit Transport Overhead Processors

to the STS-3 line rate. To accommodate unequipped application on the ADD

bus, the Telecombus Interface block may be programmed to set the ADD bus

SPE bytes to all ones. When line loopback is enabled, the Telecombus Interface

block replaces the data received on the ADD bus by the data placed on the

DROP bus.

9.8

Microprocessor Interface

The microprocessor interface block provides normal and test mode registers, and

the logic required to connect to the microprocessor interface. The normal mode

registers are required for normal operation, and test mode registers are used to

enhance the testability of the SPTX. The register set is accessed as follows:

9.9

Table 3

- Register Memory Map

Address

00H

SPTX Master Configuration

01H

SPTX Master Alarm Configuration

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