PM5347 datasheet(167/302 Pages) PMC

167 / 302 page

PM5347 S/UNI-PLUS

DATA SHEET

PMC-941033

ISSUE 6

SATURN USER NETWORK INTERFACE PLUS

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

151

PLD:

The PLD bit controls the loading of the pointer value contained in the TPOP

Arbitrary Pointer Registers. Normally the TPOP Arbitrary Pointer Registers

are written to set up the arbitrary new pointer value, the S-bit values, and the

NDF pattern. A logic one is then written to this bit position to load the new

pointer value. The new data flag bit positions are set to the programmed NDF

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 has been 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.

PM5347 Datasheet(PDF) 167 Page - PMC-Sierra, Inc