DP83849ID datasheet(63/98 Pages) NSC

63 / 98 page

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SD_OPTION

1, RW

Signal Detect Option:

1 = Default operation. Link will be asserted following detection of

valid signal level and Descrambler Lock. Link will be maintained as

long as signal level is valid. A loss of Descrambler Lock will not

cause Link Status to drop.

0 = Modified signal detect algorithm. Link will be asserted following

detection of valid signal level and Descrambler Lock. Link will be

maintained as long as signal level is valid and Descrambler re-

mains locked.

DESC_TIME

0, RW

Descrambler Timeout:

Increase the descrambler timeout. When set this should allow the

device to receive larger packets (>9k bytes) without loss of syn-

chronization.

1 = 2ms

0 = 722us (per ANSI X3.263: 1995 (TP-PMD) 7.2.3.3e)

FX_EN

Strap, RW

FX Fiber Mode Enable:

This bit is set when the FX_EN strap option is selected (pulled high)

for the respective port.

1 = Enables FX operation

0 = Disables FX operation

FORCE_100_OK

0, RW

Force 100Mb/s Good Link:

1 = Forces 100Mb/s Good Link.

0 = Normal 100Mb/s operation.

RESERVED

0, RO

RESERVED: Writes ignored, Read as 0

FEFI_EN

Strap, RW

Far End Fault Indication Mode Enable:

This bit is set when the FX_EN strap option is selected for the re-

spective port.

1 = FEFI Mode Enabled

0 = FEFI Mode Disabled

NRZI_BYPASS

0, RW

NRZI Bypass Enable:

1 = NRZI Bypass Enabled.

0 = NRZI Bypass Disabled.

SCRAM

BYPASS

Strap, RW

Scrambler Bypass Enable:

This bit is set when the FX_EN strap option is selected for the re-

spective port. In the FX mode, the scrambler is bypassed.

1 = Scrambler Bypass Enabled

0 = Scrambler Bypass Disabled

DESCRAM

BYPASS

Strap, RW

Descrambler Bypass Enable:

This bit is set when the FX_EN strap option is selected for the re-

spective port. In the FX mode, the descrambler is bypassed.

1 = Descrambler Bypass Enabled

0 = Descrambler Bypass Disabled

Table 35. 100 Mb/s PCS Configuration and Status Register (PCSR), address 16h (Continued)

Bit

Bit Name

Default

Description

DP83849ID Datasheet(PDF) 63 Page - National Semiconductor (TI)

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