AM79C930VCW datasheet(26/161 Pages) AMD

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AMD

P R E L I M I N A R Y

Am79C930

The functionality of the following pins is determined, at

least in part, by the connection of the PCMCIA pin:

PCMCIA Mode

ISA Plug and Play Mode

Pin Name

USER6

USER6/IRQ5

USER5

USER5/IRQ4

USER4

LA17

USER3

SA16

USER2

LA19

USER1

USER1/IRQ12

USER0

RFRSH

A[14:0]

SA[14:0]

LLOCKE

SA15

D[7:0]

SD[7:0]

CE1

LA18

MEMR

MEMW

REG

AEN

TXDATA

LA20

TXCMD

LA21

INPACK

LA22

ANTSLT

LA23

WAIT

IOCHRDY

STSCHG

BALE

IORD

IOR

IOWR

IOW

IREQ

IRQ9

RXC

RXC/IRQ10

USER7

USER7/IRQ11

Host System Interface Pins

PCMCIA Bus Interface

A14–0

Address Bus

Input

Signals A0 through A14 are address-bus-input lines.

Signal A0 is always used because the data interface to

the Am79C930 is only 8-bits wide.

CE1

Card Enable

Input

CE1 is an active low card enable input signal. CE1 is

used to enable even-numbered word address bytes. A0

is used to select between the even and odd numbered

bytes within the addressed word.

D7–0

Data Bus

Input/Output

Signals D7 through D0 are the bidirectional data bus for

PCMCIA. The most significant bit is D7.

Output Enable

Input

OE is an active low-output-enable input signal. OE is

used to gate memory read data from the Am79C930 de-

vice onto the PCMCIA data bus.

OE should be deas-

serted during memory write cycles to the Am79C930

device.

OE is used for Common memory accesses and

Attribute memory accesses.

INPACK

Input Acknowledge

Output

The

INPACK signal is an active low signal. INPACK is

asserted when the Am79C930 device is selected and

the Am79C930 device can respond to an I/O read cycle

at the address currently on the address bus. This signal

is used by the host to control the enable of any input data

buffer between the card and the CPU. This signal will be

inactive until the card is configured.

IORD

I/O Read

Input

IORD is an active low signal. IORD is asserted by the

host system to indicate to the Am79C930 device that a

read from the Am79C930’s I/O space is being per-

formed. The Am79C930 device will not respond to the

IORD signal until it has been configured for I/O opera-

tion by the system.

IOWR

I/O Write

Input

IOWR is an active low signal. IOWR is asserted by the

host system to indicate to the Am79C930 device that a

write to the Am79C930’s I/O space is being performed.

The Am79C930 device will not respond to the

IOWR sig-

nal until it has been configured for I/O operation by

the system.

IREQ

Interrupt Request

Output

IREQ is an active low signal. IREQ is asserted by the

Am79C930 device to indicate to the host that software

service is required.

IREQ can operate in the pulse mode

or level mode of operation as defined in the PCMCIA

specification. In pulse mode of operation, an interrupt is

signaled by the Am79C930 device by asserting a low-

going pulse of at least 0.5 microseconds (

µs). In pulse

mode of operation, the inactive state (i.e., HIGH output)

is driven, not floated. In level mode of operation, an in-

terrupt is signaled by the Am79C930 device by assert-

ing a LOW level. In level mode of operation, the inactive

state (i.e., HIGH output) is driven, not floated.

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