SBI Bus Serializer ASSP Telecom Standard Product Data Sheet
Released
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000168, Issue 5
318
13.6 Using the Performance Monitoring Features
The performance monitor counters within the different blocks are provided for performance
monitoring purposes. All performance monitor counters have been sized to not saturate if
polled at regular intervals. The counters will saturate and not roll over if they reach their
maximum value.
Writing to the SBS Master Signal Monitor #1, Accumulation Trigger Register (014H) causes a
device update of all the counters. If this register is written to, the TIP bit in the SBS Receive
Synchronization Delay Register (007H) can be polled to determine when all the counter values
have been transferred and are ready to be read. Alternately, software can wait the number of
SYSCLK cycles shown in
Table 27 Maximum Performance Monitor Counter Transfer Time
Trigger Register Address
Block Name
SYSCLK cycles to complete
transfer (MAX)
014H
All Blocks (WPP, PPP, RW8D
and RP8D)
17
07CH
WPP
17
08CH
PPP
17
0C2H
RW8D
6
0CAH
RP8D
6
13.7 Configuring the Transmit Encoders (TW8E and TP8E)
The transmit encoder blocks (TW8E and TP8E) may be configured in one of three possible
termination modes. The selection between the three modes is performed at the STS/AU level.
The three modes are:
Low Order Path Termination Mode (LPT).
This mode must be used when connecting the
SBS to an SBI or SBI336 bus. This mode may also be used when connecting the SBS to a
Telecom Bus where the V5 and TPL signals must be preserved across the Serial Telecom Bus.
The ERDI[1:0] and REI bits of the V5 byte (bits 0, 4 and 5) will be preserved but the remaining
bits will be set to zero by the receive decoder at the far end of the serial link. The V1 and V2
pointers will also be set to all zeros.
High Order Path Termination Mode (HPT).
This mode may be used when connecting the
SBS to a Telecom Bus where the V1 and V2 pointers must be preserved across the Serial
Telecom Bus. Note that in this mode, the V5 signal will be zeroed out by the receive decoder at
the far end of the serial link, but the data within the V5 byte will be preserved. In this mode the
J1 byte will be overwritten with a control character on the serial link.
Multiplex Section Termination Mode (MST).
This mode may be used when connecting the
SBS to a Telecom Bus where H1 and H2 pointers must be preserved across the Serial Telecom
Bus and the J1 byte cannot be overwritten. Note that in this mode, a receiving device must use
the H1/H2 pointers to locate the J1 byte position.