PM5350-1 Datasheet, PDF (111/196 Pages) PMC-Sierra, Inc – SATURN USER NETWORK INTERFACE

DATA SHEET
PMC-960924
ISSUE 5
PM5350 S/UNI-ULTRA
SATURN USER NETWORK INTERFACE
PLD:
The PLD bit controls the loading of the pointer value contained in the
Arbitrary Pointer Registers. Normally, the Arbitrary Pointer Registers are
written to set up the arbitrary new pointer value and a logic one is then written
to this bit position to load the new pointer value.
If a legal value (i.e. 0 • pointer value • 782) is transferred from the Arbitrary
Pointer Registers, the transmit payload pointer will immediately change to the
corresponding byte position. If a value greater than 782 is transferred, the
payload pointer remains unchanged.
This bit is automatically cleared after the new payload pointer has been
loaded. This bit has no effect if the FIXPTR bit of the Master Control register
is a logic 1.
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 transmit pointer bit (FTPTR) enables the insertion of the pointer
value contained in the Arbitrary Pointer Registers into the transmit stream for
diagnostic purposes. This allows upstream payload mapping circuitry to
continue functioning normally and a valid SPE to continue to be generated,
although it is unlikely to be extracted by far end circuitry. If FTPTR is set to
logic 1, 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 0, a valid pointer is inserted. This
bit has no effect if the FIXPTR bit of the Master Control register is a logic 1.
Reserved:
The reserved bits must be programmed to logic zero for proper operation.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 99