
PM5317 SPECTRA-9953 Telecom Standard Product Data Sheet
Release
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000741, Issue 5
405
Indirect Register 02H: TSVCA Diagnostic/Configuration
Bit
Type
Function
Default
Bit 15
R/W
PTRRST
0
Bit 14
R/W
PTRSS[1]
0
Bit 13
R/W
PTRSS[0]
0
Bit 12
R/W
JUS3DIS
0
Bit 11
R/W
PTRDD[1]
0
Bit 10
R/W
PTRDD[0]
0
Bit 9
R/W
Unused
0
Bit 8
R/W
Unused
0
Bit 7
R/W
unused
0
Bit 6
R/W
Diag_TOH_PAIS
0
Bit 5
R/W
Diag_NDFREQ
0
Bit 4
R/W
Diag_FifoAISDis
0
Bit 3
R/W
Diag_PAIS
0
Bit 2
R/W
Diag_LOP
0
Bit 1
R/W
Diag_NegJust
0
Bit 0
R/W
Diag_PosJust
0
The SVCA Diagnostic Register is provided at SVCA Read/Write Address 02H. These bits
should be set to their default values during normal operation of the SVCA. The
Diagnostic/Config register is only valid for master paths. Slave path Diagnostic/Config
registers are overwritten with the master path’s Diagnostic/Config register value.
Diag_PosJust
The Diag_PosJust bit forces the SVCA to generate outgoing positive justification events on
the selected path(s). When set to 1, the SVCA generates positive justification events at the
rate of one every four frames regardless of the current level of the internal FIFO. Prolonged
application may cause the FIFO to overflow. However, the fifo monitor block has priority
over the diagnostic justifications, so if the fifo level gets too high, then negative
justifications will be performed, even if the Diag_PosJust bit is written high. As such, it is
difficult to make the fifo overflow.
Diag_NegJust
When set high, The Diag_NegJust bit forces the SVCA to generate outgoing negative
justification events on the selected path(s). When set to 1, the SVCA generates negative
justification events at the rate of one every four frames regardless of the current level of the
internal FIFO. Prolonged application may cause the FIFO to underflow. However, the fifo
monitor block has priority over the diagnostic justifications, so if the fifo level gets too low,
then positive justifications will be performed, even if the Diag_NegJust bit is written high.
As such, it is difficult to make the fifo underflow.