TXC-06312BIOG Transwitch Corporation, TXC-06312BIOG Datasheet - Page 95

• Manufacturer Part Number: TXC-06312BIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-06312BIOG

• Lead Free Status / Rohs Status: Supplier Unconfirmed

9 5 o f 2 0 2
10.5 PRBS GENERATOR AND PRBS ANALYZER
The PHAST-12N has a built-in PRBS generator and analyzer for test purposes. PRBS can be
inserted on one path of the Terminal Side input port of the cross connect (port #3). This way
PRBS can be routed through the cross connect to each of its three output ports. The PRBS
analyzer is situated on the Terminal Output of the cross connect (port #3). The PRBS
polynomial is
can optionally be inverted. In order to use the PRBS generator/analyzer functionality the
AUG1_Mode_Config record in the CDR/CS block has to be configured properly. This record
is a don’t care if the PRBS functionality is not used. Configuration of the PRBS generator and
analyzer is done in the XConnectPRBSControl registers.
The PRBS analyzer will lock on the incoming PRBS data after 24 consecutive correct bits.
This is reported in the Status_Unlatched register. Once in lock the PRBS analyzer will stay
in
PRBSBitErrorCounter, which is reset each time a (software) read access is done to this
register (clear-on-read).
The state machines are reset when disabling the PRBS generator/analyzer, so make sure to
disable the PRBS generator and analyzer before (re-)configuring them.
Important Notes:
1. Although the PRBS bit error counter is mapped in the memory map of the CDR/CS block,
2. B3 may contain errors as it is not recalculated on the PRBS data.
the System clock (LINETXCLK) must be available when reading this counter.
lock
and
2
Generator
23
PRBS
count
–
Line Side
1
. The output of the PRBS generator and the input of the PRBS analyzer
the
PRBS
- Operation -
VC-3/VC-4/VC-4-4c/STS-1/STS-3c/STS-12c cross connect
Generator
Generator
received
Retimer/
Pointer
POH
bit
errors.
Monitor
These
POH
PRELIMINARY TXC-06312B-MB, Ed. 2
Termination Side
are
PHAST-12N Device
Analyzer
PRBS
accessible
APS Side
DATA SHEET
TXC-06312B
via
June 2005
the