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S/UNI-QUAD
PMC-Sierra, Inc.
PM5349 S/UNI-QUAD
DATASHEET
PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
125
pattern for the first frame; subsequent frames have the new data flag bit
positions set to the normal pattern (0110) unless the NDF bit described above
is set to a logic one. This bit is automatically cleared after the new payload
pointer is loaded.
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 is inserted in the
transmit 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.
SOS:
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.
FTPTR:
The force transient pointer bit (FTPTR) enables the insertion of the pointer
value contained in the Arbitrary Pointer Registers into the transmit stream for
diagnostic purposes. When FTPTR is a 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.
When FTPTR is a logic zero, the pointer value in the Current Pointer registers
is inserted in the transmit stream.
Reserved:
The reserved bits must be programmed to logic zero for proper operation.