AM79C930VCW datasheet(120/161 Pages) AMD

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Am79C930

TCR26: Reserved

This register is the TAI reserved location register.

CONFIGURATION REGISTER INDEX:

1Ah

Bit

Name

Reset Value

Description

7–0

Reserved

–

Reserved. Must be written as a 0. Reads of this bit produce

undefined data.

TCR27: TIP LED Scramble

This register is the Network Interface Polarity register.

This register is used to set the polarity of some of the

transceiver interface output pins.

CONFIGURATION REGISTER INDEX:

1Bh

Bit

Name

Reset Value

Description

DISRNR

Disable RUNERR. When DISRNR is set to a 1, then the RUNERR

bit of TCR11 will always be held at a 0 value. When DISRNR is set

to a 0, then the RUNERR bit of TCR11 will function as described in

the TCR11 bit description.

Reserved

–

Reserved. Must be written as a 0. Reads of these bits produce

undefined data.

Reserved

Reserved. Must be written as a 0. Reads of these bits produce

undefined data.

LNKDR

LNK pin drive. When set to a 0, the drive of the LNK pin will be open

drain. When set to a 1, the drive of the

LNK pin will be totem pole,

i.e., both high and low output values will be driven.

Complete control of the function of the

LNK pin is described in the

Multi-Function Pin section.

ACTDR

ACT pin drive. When set to a 0, the drive of the ACT pin will be open

drain. When set to a 1, the drive of the

ACT pin will be totem pole,

i.e., both high and low output values will be driven.

Complete control of the function of the

ACT pin is described in the

Multi-Function Pin section.

FDETPOL

FDET Polarity. When this bit is set to a 0, then the polarity of the

FDET output will be low assert, such that when the SFD pattern has

been recognized in the incoming receive data stream or the outgo-

ing transmit data stream, the

FDET pin will be driven to a LOW logic

level. When this bit is set to a 1, then the polarity of the

FDET output

will be high assert, such that when the SFD pattern has been recog-

nized in the incoming receive data stream or the outgoing transmit

data stream, the

FDET pin will be driven to a HIGH logic level.

TXPEPOL

TXPE Polarity. When this bit is set to a 0, then the polarity of the

TXPE output will be low assert, such that when the TGAP1 counter

expires, the

TXPE pin will be driven to a LOW logic level. When this

bit is set to a 1, then the polarity of the

TXPE output will be high as-

sert, such that when the TGAP1 counter expires, the

TXPE pin will

be driven to a HIGH logic level.

TXMODPOL

TXMOD Polarity. When this bit is set to a 0, then the polarity of the

TXMOD output will be low assert, such that when the TGAP2

counter expires, the

TXMOD pin will be driven to a LOW logic level.

When this bit is set to a 1, then the polarity of the

TXMOD output will

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