PM5347 datasheet(196/302 Pages) PMC

196 / 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

180

Bit

Type

Function

Default

Bit 7

R/W

CDDIS

Bit 6

R/W

RXBYTEPRTY

Bit 5

Unused

Bit 4

Unused

Bit 3

R/W

RGFCE[3]

Bit 2

R/W

RGFCE[2]

Bit 1

R/W

RGFCE[1]

Bit 0

R/W

RGFCE[0]

RGFCE[3:0]:

The RGFCE[3:0] bits are used to enable the GFC[3:0] bits serialized on

output RGFC. For example, when RGFCE[3] is a logic one, the GFC[3] bit is

output on RGFC. When RGFCE[3] is a logic zero, the GFC[3] bit is not output

on RGFC.

RXBYTEPRTY:

The receive byte parity, RXBYTEPRTY, mode bit selects between byte and

word parity mode for outputs RXPRTY[1:0]. When the RXBYTEPRTY bit is

set to logic one, byte parity mode is selected; otherwise, word parity mode is

selected. In byte parity mode, RXPRTY[1] is the parity bit for outputs

RDAT[15:8], and RXPRTY[0] is the parity bit for outputs RDAT[7:0]. In word

parity mode, RXPRTY[1] is the parity bit for outputs RDAT[15:0], and

RXPRTY[0] is held low. Word parity mode can only be selected when the

BUS8 input is low (i.e., the 16-bit FIFO interface is selected).

CDDIS:

The cell delineation disable bit, CDDIS, is used to defeat the cell delineation

function. When the CDDIS bit is set to logic one, HCS errors are ignored,

which makes every byte appear like a valid cell boundary. Ignoring HCS

errors causes the cell delineation state machine to lock onto an arbitrary cell

boundary and to enter and remain in the SYNC state. Once in the SYNC

state, the incoming data is written to the FIFO.

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