AM79C930VCW datasheet(113/161 Pages) AMD

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Am79C930

value that is present on the LLOCKE pin, regardless of the setting of

the PCMCIA pin.

The control of the function of the LLOCKE/SA15 pin is described in

the

Multi-Function Pin section.

Reserved

–

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

undefined data.

4:0

USEREN[4:0]

00h

USER[4:0] Enable. These five bits are used to determine the direc-

tion of the USER[4:0] pins. When any bit of the USEREN register is

set to a 1, then the corresponding USER device pin is enabled to

drive both high and low output values. USER output values are de-

termined by the individual bit settings of the USERDT register

(TIR29). When any bit of the USEREN register is reset to a 0, then

the corresponding USER device pin is forced to a high-impedance

state. Reads of the USERDT register (TIR29) will yield the value

that is present on any particular USER pin.

The control of the function of each of the USER pins is described in

the

Multi-Function Pin section.

TCR15: Pin Configuration C

This register is the Pin Configuration C register. This

ACT, STSCHG,

USER5, USER6, RXC, TXCMD,

TXDATA, and ANTSLT

pins as outputs or as high impedance inputs.

CONFIGURATION REGISTER INDEX:

0Fh

Bit

Name

Reset Value

Description

ANTSLTLEN

ANTSLT Enable. ANTSLTLEN, the ANTSLTLFN bit of TCR30, the

ANTSEN bit of TIR26, and the PCMCIA pin are used to determine

the function of the

ANTSLT/LA23 pin.

The control of the function of the

ANTSLT/LA23 pin is described in

the

Multi-Function Pin section.

TXDLEN

TXDATA Enable. TXDLEN, the TXDLFN bit of TCR30, and the

PCMCIA pin are used to determine the direction of the

TXDATA/

LA20 pin.

The control of the function of the

TXDATA/LA20 pin is described in

the

Multi-Function Pin section.

TXCMEN

TXCMD Enable. TXCMEN, the TXCMFN bit of TCR30, the RCEN

bit of TIR11 and the PCMCIA pin are used to determine the direc-

tion of the TXCMD/LA21 pin.

The control of the function of the TXCMD/LA21 pin is described in

the

Multi-Function Pin section.

RXCEN

RXC Enable. RXCEN is used with RXCFN (TCR28[7]), the ISA

PnP interrupt level select register, the ISA PnP interrupt type regis-

ter, and the PCMCIA pin to determine the function of the RXC/

IRQ10 pin.

The control of the function of the RXC/IRQ10 pin is described in the

Multi-Function Pin section.

USER6EN

USER6 Enable. USER6EN, the USER6FN bit of TCR15, the ISA

PnP interrupt level select register, the ISA PnP interrupt type regis-

ter, and the PCMCIA pin are used to determine the function of the

USER6IRQ5 pin.

The control of the function of the USER6/IRQ5 pin is described in

the

Multi-Function Pin section.

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