AM79C930 datasheet(36/161 Pages) AMD

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P R E L I M I N A R Y

Am79C930

Pin 94: RXC/IRQ10/EXTA2DST

The RXC/IRQ10 pin may be configured for input opera-

tion, output operation, ISA IRQ10 operation, and as an

output providing the RX clock information (whether de-

rived from the RXDATA stream through Am79C930

device DPLL operation or simply rerouted from the

RXCIN input) according to the following table:

Note that a read of the RXCD bit (TIR11[7]) will always

give the current RXC/IRQ10 pin value, regardless of pin

configuration setting.

In addition to the functionality listed above, the RXC/

IRQ10/EXTA2DST pin may be used to control the start

of the A/D conversion process. When the UXA2DST

bit of TCR25 has been set to a 1, then the normal

internal state machine control of the A/D sample and

conversion procedure or a rising edge on the RXC/

IRQ10/EXTA2DST pin will trigger an A/D conversion

procedure. By allowing external control of the start of the

A/D conversion process, the EXTADTST input allows

synchronization of the internal A/D function to an exter-

nal circuit that desires to use the A/D converter.

RXC/

PCMCIA

RXCFN

RXCEN

IRQ Select

IRQ Type

IRQ10

TCR28[7]

TCR15[4]

PnPx70

PnPx71

Pin Direction

Pin Data

IRQ10

000

≠Ah

TIR11[7]

001

≠Ah

TIR11[7]

XXX

RXC

TIR11[7]

XXX

RXC

Pin 95: USER6/IRQ5/EXTSDF

The USER6/IRQ5/EXTSDF pin may be configured for

input operation, output operation, or ISA IRQ5 operation

according to the following table:

Note that a read of the USER6D bit (TIR11[6]) will al-

ways give the current USER6/IRQ5 pin value, regard-

less of pin configuration setting.

USER6/

PCMCIA

ENXSDF

USER6FN

USER6EN

IRQ Select

IRQ Type

IRQ5

TCR28[6]

TCR7[6]

TCR15[3]

PnPx70

PnPx71

Pin Direction

Pin Data

TIR11[6]

IRQ5

000

≠5h

TIR11[6]

001

≠5h

TIR11[6]

In addition to the functionality listed above, the

USER6/IRQ5/EXTSDF pin may be used to enable the

function of the RX state machine within the Am79C930

device. This capability is controlled by the ENXSDF bit

and the ENXCHBSY bit, both of TCR28. When the

ENXSDF bit and the ENXCHBSY bit of TCR28 are both

set to a 1 and either TCR28 bit 4 is set to 0 or an antenna

selection has been made, then the value of the

USER6/IRQ5/EXTSDF pin will be used to enable trans-

fers of RXD data into the RX FIFO, provided the

Am79C930 device firmware has previously enabled the

RX state machine by setting the RXS bit of TIR16. In

addition, the EXTSDF value will be sent to the SDF inter-

rupt bit of TIR5[2]. TIR5[2] will, if unmasked, produce an

interrupt to the 80188 embedded controller.

Note that setting the ENXSDF bit of TCR28 to a 1

will cause the USER6/IRQ5/EXTSDF pin to function as

an input, regardless of other control bit settings.

Pin 96: USER5/IRQ4/EXTCHBSY

The USER5/IRQ4 pin may be configured for input op-

eration, output operation, or ISA IRQ4 operation accord-

ing to the table below.

Note that a read of the USER5D bit (TIR11[5]) will al-

ways give the current USER5/IRQ4/EXTCHBSY pin

value, regardless of pin configuration setting. In addition

to these bits, the USER5/IRQ4/EXTCHBSY pin may

be used to produce interrupts to the 80188 embedded

controller.

This

capability

controlled

the

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