PM7344 S/UNI-MPH
DATA SHEET
PMC-950449
ISSUE 6
MULTI-PHY USER NETWORK INTERFACE
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.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
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PMC [ PMC-SIERRA, INC ]
