DP83849CVSSLASHNOPB datasheet(63/101 Pages) TI1

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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)

RESERVED

0, RO

RESERVED:

Must be zero.

FORCE_100_OK

0, RW

Force 100Mb/s Good Link:

1 = Forces 100Mb/s Good Link.

0 = Normal 100Mb/s operation.

4:3

RESERVED

0,RO

RESERVED:

Must be zero

NRZI_BYPASS

0, RW

NRZI Bypass Enable:

1 = NRZI Bypass Enabled.

0 = NRZI Bypass Disabled.

1:0

RESERVED

0,RO

RESERVED:

Must be zero.

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

Bit

Bit Name

Default

Description

DP83849CVS/NOPB Datasheet(PDF) 63 Page - Texas Instruments

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