PM5380-BI PMC-Sierra, Inc., PM5380-BI Datasheet - Page 193

• Manufacturer Part Number: PM5380-BI
• Description: Network Interface, SATURN User Network Interface (8x155) Telecom Standard Product
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC- 2010299, Issue 2
SOS:
FTPTR:
Reserved:
Note: When loading an out of range pointer (that is a pointer with a value greater than 782),
the TPOP continues to operate with timing based on the last valid pointer value. The out of
range pointer value will of course be inserted in the STS-3c/STM-1 stream. Although a
valid SPE will continue to be generated, it is unlikely to be extracted by downstream
circuitry, which should be in a loss of pointer state.
This bit is automatically cleared after the new payload pointer has been loaded.
The SOS bit controls the stuff opportunity spacing between consecutive SPE positive or
negative stuff events. When SOS is a logic zero, stuff events may be generated every frame
as controlled by the PSE and NSE register bits described above. When SOS is a logic one,
stuff events may be generated at a maximum rate of once every four frames.
The force transmit pointer bit (FTPTR) enables the insertion of the pointer value contained
in the Arbitrary Pointer Registers into the POUT[7:0] stream for diagnostic purposes. This
allows the ATM/POS payload mapping circuitry to continue functioning normally and a
valid SPE to continue to be generated, although it is unlikely to be extracted by downstream
circuitry as the downstream pointer processor should be in a loss of pointer state.
If FTPTR is set to logic one, the APTR[9:0] bits of the Arbitrary Pointer Registers are
inserted into the H1 and H2 bytes of the transmit stream. At least one corrupted pointer is
guaranteed to be sent. If FTPTR is a logic zero, a valid pointer is inserted.
The reserved bits must be programmed to logic zero for proper operation.
S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
Released
193