PM7344 S/UNI-MPH
DATA SHEET
PMC-950449
ISSUE 6
MULTI-PHY USER NETWORK INTERFACE
DCR:
The disable clock recovery (DCR) bit is used when RDP/RDD[x] and
RDN/RLCV[x] contain NRZ formatted data. When DCR is a logic 1, the
RCLKI[x] input contains the recovered clock. When DCR is a logic 0, the
clock is recovered from the RDP[x] and RDN[x] inputs.
SYNC:
The SYNC bit enables synchronization of the recovered clock (RCLKI[x]) to
the 8x clock when clock recovery is disabled. When SYNC is a logic 1,
RCLKI[x] transitions are synchronized to the rising edges of the 8x clock.
This bit must be set to logic 1 when clock recovery is disabled in T1 mode
(DCR is a logic 1, MODE[1:0] in Receive Configuration register is 00B). This
bit must be set to logic 0 if in E1 mode (MODE[1:0] in Receive Configuration
register is 01B).
ALGSEL:
The Algorithm Select (ALGSEL) bit specifies the algorithm used by the DPLL
for clock and data recovery. The choice of algorithm determines the high
frequency input jitter tolerance of the CDRC. When ALGSEL is set to logic 1,
the CDRC jitter tolerance is increased to approach 0.5UIpp for jitter
frequencies above 20KHz. When ALGSEL is set to logic 0, the jitter
tolerance is increased for frequencies below 20KHz (i.e. the tolerance is
improved by 20% over that of ALGSEL=1 at these frequencies), but the
tolerance approaches 0.4UIpp at the higher frequencies.
O162:
When the E1 format is selected and the AMI bit is logic 0, the
Recommendation O.162 compatibility select bit (O162) allows selection
between two line code definitions:
1.) If O162 is a logic 0, a line code violation is indicated if the serial stream
does not match the verbatim HDB3 definition given in Recommendation
G.703. A bipolar violation that is not part of an HDB3 signature or a bipolar
violation in an HDB3 signature that is the same polarity as the last bipolar
violation results in a line code violation indication.
2.) If O162 is a logic 1, a line code violation is indicated by a LCV output
pulse if a bipolar violation is of the same polarity as the last bipolar violation,
as per Recommendation O.162.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
96
PMC [ PMC-SIERRA, INC ]
