PM7346 datasheet(262/419 Pages) PMC

262 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 241

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

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 12.8 on 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.

PM7346 Datasheet(PDF) 262 Page - PMC-Sierra, Inc

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