AM79C930VCW datasheet(25/161 Pages) AMD

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P R E L I M I N A R Y

AMD

Am79C930

PIN DESCRIPTIONS

Pins with Internal Pull Up or Pull

Down Devices

Several pins of the Am79C930 device include internal

pull up or pull down devices. With the exception of the

RESET pin, these pins are fully programmable as inputs

or outputs when the PCMCIA mode has been selected.

A subset of these pins is programmable when the ISA

Plug and Play mode has been selected. These pins will

come up after RESET in the high impedance state with

the pull up or pull down device actively determining the

value of the pin, unless an external driving source

overdrives the pull up or pull down device. VINITDN

bit (MIR9[2]) is used to turn off all pull up and pull

down devices.

The following list indicates those pins that contain pull

up and pull down devices:

PCMCIA Mode

Internal Device

Size of Internal

Pin Name

Type

Device

USER[6]/IRQ5

pull up

> 100K

Ω

USER[5]/IRQ4

pull up

> 100K

Ω

USER[4]/LA17

pull up

> 100K

Ω

USER[3]/SA16

pull up

> 100K

Ω

USER[2]/LA19

pull up

> 100K

Ω

USER[1]/IRQ12

pull down

> 100K

Ω

USER[0]/RFRSH

pull down

> 100K

Ω

LLOCKE/SA15

pull down

> 100K

Ω

ANTSLT/LA23

pull up

> 100K

Ω

TXDATA/LA20

pull up

> 100K

Ω

TXCMD/LA21

pull down

> 100K

Ω

RXC/IRQ10

pull up

> 100K

Ω

USER7/IRQ11

pull up

> 100K

Ω

LFPE

pull up

> 100K

Ω

HFPE

pull up

> 100K

Ω

RXPE

pull up

> 100K

Ω

ANTSLT

pull down

> 100K

Ω

TXCMD

pull up

> 100K

Ω

TXPE

pull up

> 100K

Ω

SDCLK

pull up

> 100K

Ω

SDDATA

pull up

> 100K

Ω

SDSEL[3]

pull up

> 100K

Ω

SDSEL[2]

pull up

> 100K

Ω

SDSEL[1]

pull up

> 100K

Ω

ACT

pull up

> 100K

Ω

LNK

pull up

> 100K

Ω

TXMOD

pull up

> 100K

Ω

STSCHG/BALE

pull up

> 100K

Ω

TXC

pull up

> 100K

Ω

Following the RESET operation, the Am79C930 firm-

ware or driver software should appropriately program

the D bits of TIR and TCR registers, and then set the FN

and EN bits of TIR and TCR registers to set the values

and directions of each of these programmable pins.

Once these operations have been performed, the soft-

ware should then program the INITDN bit of MIR9 in or-

der to disable all of the pull up and pull down devices.

Unused programmable pins should be programmed for

output mode, or may be left in the default high imped-

ance state if an external pull down or pull up device is left

connected to the pin. Unused programmable pins must

not be programmed for input mode with no external

source (pull-device or driver) connected and the INITDN

bit of MIR9 set to a 1, since this could lead to unaccept-

able levels of power consumption by the Am79C930 de-

vice. For more information on programmable pins, see

the Multi-Function Pins section.

Configuration Pins

PCMCIA

PCMCIA/ISA Bus Interface Select

Input

The value of this pin will asynchronously determine the

operating mode of the Am79C930 device, regardless of

the state of the RESET pin and regardless of the state of

the CLKIN pin. If the PCMCIA pin is tied to VCC, then the

Am79C930 controller will be programmed for PCMCIA

Bus Mode. If the PCMCIA pin is tied to VSS, then the

Am79C930 controller will be programmed for ISA Plug

and Play Bus Interface Mode.

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