AM79C930 datasheet(35/161 Pages) AMD

35 / 161 page

P R E L I M I N A R Y

AMD

Am79C930

Note that a read of the USERDT[0] bit (TIR29[0]) will al-

ways give the current USER0/RFRSH pin value, regard-

less of pin configuration setting.

Pin 91: USER1/IRQ12/EXTCTS/EXINT188

The USER1/IRQ12 pin may be configured for input

operation, output operation, or ISA IRQ12 operation ac-

cording to the following table:

USER1/

PCMCIA

USER1EN

IRQ Select

IRQ Type

IRQ12

TCR14[1]

PnPx70

PnPx71

Pin Direction

Pin Data

IRQ12

≠Ch

TIR29[1]

Note that a read of the USERDT[1] bit (TIR29[1]) will al-

ways give the current USER1/IRQ12 pin value, regard-

less of pin configuration setting.

In addition to the functionality listed above, the

USER1/IRQ12/EXTCTS/EXINT188 pin may be used to

enable the internal TX state machine. This capability is

controlled by the CTSEN bit of TCR7 and operates inde-

pendently of the table above and independently of the

U1INTCNT bits of TCR7. When the CTSEN bit of TCR7

is set to 1, then the value of the USER1/IRQ12/

EXTCTS/EXINT188 pin will be ANDed with the value of

the TXS bit of TIR8. The output of the AND gate will

then be used to determine the start of the TX state

machine. In this way, an external signal, through the

USER1/IRQ12/EXTCTS/EXINT188 input, can be used

to control the start of the TX state machine, provided that

Am79C930 device firmware has enabled the operation

by setting the TXS bit of TIR8.

In addition to the functionality listed above, the

USER1/IRQ12/EXTCTS/EXINT188 pin may be used to

produce interrupts to the 80188 embedded controller.

This capability is controlled by the U1INTCNT bits of

TCR7 and operates independently of the bits in the

table above and independently of the CTSEN bit of

TCR7.Interrupts

that

are

routed

through

the

USER1/IRQ12/EXTCTS/EXINT188 pin are indicated in

the U1INT bit of TCR11. The following table lists the pro-

gramming options for using the USER1/IRQ12/

EXTCTS/EXINT188 pin as a source of external interrupt

to the 80188 controller.

U1INTCNT

USER1 Pin

U1INT Bit

TCR7[4:3]

Event

Result (TCR11[3])

0 => interrupt disabled

reset default condition

rising edge

1 => interrupt signalled

falling edge

1 => interrupt signalled

rising or falling edge

1 => interrupt signalled

Pin 92: USER7/IRQ11

The USER7/IRQ11 pin may be configured for input op-

eration, output operation, or ISA IRQ11 operation ac-

cording to the following table:

Note that a read of the USER7DL bit (TIR29[7]) will al-

ways give the current USER7/IRQ11 pin value, regard-

less of pin configuration setting.

USER7DL (TIR29[7]) gives the current value of the

USER7/IRQ11 pin.

USER7/

PCMCIA

USER7FN

USER7EN

IRQ Select

IRQ Type

IRQ11

TC30[7]

TCR14[7]

PnPx70

PnPx71

Pin Direction

Pin Data

IRQ11

≠Bh

TIR29[7]

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