PM7347 datasheet(211/341 Pages) PMC

211 / 341 page

S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

211

Document ID: PMC-1990267, Issue 3

Bit

Type

Function

Default

Bit 7

R/W

TPTYP

Bit 6

R/W

TCALEVEL0

Bit 5

R/W

HSCR

Bit 4

R/W

HCSDQDB

Bit 3

R/W

HCSB

Bit 2

R/W

HCSADD

Bit 1

R/W

DSCR

Bit 0

R/W

FIFORST

The FIFORST bit is used to reset the four cell transmit FIFO. When FIFORST is set to logic

zero, the FIFO operates normally. When FIFORST is set to logic one, the FIFO is

immediately emptied and ignores writes. The FIFO remains empty and continues to ignore

writes until a logic zero is written to FIFORST. Null/unassigned cells are transmitted until a

subsequent cell is written to the FIFO.

See Section 13.9on resetting the receive and transmit FIFOs.

DSCR

The DSCR bit controls the scrambling of the cell payload. When DSCR is a logic one, cell

payload scrambling is disabled. When DSCR is a logic zero, payload scrambling is enabled.

In the case where HSCR is logic one, the payload will be scrambled (along with the header)

regardless of the setting of the DSCR bit.

HCSADD

The HCSADD bit controls the addition of the coset polynomial, x6+x4+x2+1, to the HCS

octet prior to insertion in the synchronous payload envelope. When HCSADD is a logic one,

the polynomial is added, and the resulting HCS is inserted. When HCSADD is a logic zero,

the polynomial is not added, and the unmodified HCS is inserted. HCSADD takes effect

unconditionally regardless of whether a null/unassigned cell is being transmitted or whether

the HCS octet has been read from the FIFO.

PM7347 Datasheet(PDF) 211 Page - PMC-Sierra, Inc

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