PM5347 datasheet(197/302 Pages) PMC

197 / 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

181

Bit

Type

Function

Default

Bit 7

R/W

FIFOE

Bit 6

TSOCI

Bit 5

FOVRI

Bit 4

R/W

DHCS

Bit 3

R/W

HCSB

Bit 2

R/W

HCSADD

Bit 1

R/W

DSCR

Bit 0

R/W

FIFORST

FIFORST:

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

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

FIFO is immediately emptied and ignores writes. The FIFO remains empty

and continues to ignore writes until FIFORST is cleared. Idle/unassigned

cells are transmitted until a subsequent cell is written to the transmit FIFO.

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.

HCSADD:

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

to the HCS octet prior to insertion in the transmit stream. 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

an idle/unassigned cell is being transmitted or whether the HCS octet has

been read from the FIFO.

PM5347 Datasheet(PDF) 197 Page - PMC-Sierra, Inc

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