PM7344 datasheet(63/293 Pages) PMC

63 / 293 page

PM7344 S/UNI-MPH

DATA SHEET

PMC-950449

ISSUE 6

MULTI-PHY USER NETWORK INTERFACE

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

On end of message, the Status Register also indicates the FCS status and the

number of valid bits in the final data byte. Interrupts are generated when one,

two or three bytes (programmable via the RFDL configuration register) are stored

in the FIFO buffer. Interrupts are also generated when the terminating flag

sequence, abort sequence, or FIFO buffer overrun are detected.

When the internal HDLC receiver is disabled, the serial data extracted by the

FRMR block is output on the RDLSIG[x] pin updated on the falling clock edge

output on the RDLCLK[x] pin.

9.9

T1/E1 Framing Insertions (TRAN)

The Basic Transmitter function is provided by the TRAN block. The TRAN block

inserts the T1-SF or T1-ESF framing for the 1.544 Mbit/s data stream or the E1

basic framing and CRC multiframe for the 2.048 Mbit/s data stream.

A data link is provided for T1- ESF and E1 framing formats. The TRAN

interfaces to the XFDL and XBOC blocks to provide a variety of data link sources

including bit oriented codes (T1-ESF format only) and LAPD messages. Support

is provided for the transmission of framed or unframed inband code sequences

(T1 format only) and transmission of AIS or yellow CFA signals for all formats.

The line code of the transmit data stream may be selected to be one of AMI,

B8ZS, or HDB3.

9.10

T1 Inband Loopback Code Generator (XIBC)

The Inband Loopback Code Generator function is provided by the XIBC block.

This block generates a stream of inband loopback codes to be inserted into a T1

data stream. The stream consists of continuous repetitions of a specific code

and can be either framed or unframed. When the XIBC is enabled to generate a

framed stream, the framing bit overwrites the inband code pattern. The contents

of the code and its length are programmable from 3 to 8 bits. The XIBC

interfaces directly to the TRAN Basic Transmitter block.

9.11

T1 Pulse Density Enforcer (XPDE)

The Pulse Density Enforcer function is provided by the XPDE block. Pulse

density enforcement is enabled by a register bit within the XPDE.

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