VT8231 datasheet(67/132 Pages) ETC

67 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-61-

Function 0 Registers - PCI to ISA Bridge

7HFKQRORJLHV ,QF

:H &RQQHFW

Plug and Play Control

Offset 50 – PNP DMA Request Control ..........................RW

7-4

Reserved

.............................................. default = 0

3-2

PnP Routing for Parallel Port DRQ..... def = DRQ3

1-0

PnP Routing for Floppy DRQ............... def = DRQ2

DRQ Mapping: 00=DRQ0, 01=DRQ1, 10=DRQ2, 11=DRQ3

Offset 51 - PNP IRQ Routing 1 ........................................RW

7-4

PnP Routing for Parallel Port IRQ (see PnP IRQ

routing table)

3-0

PnP Routing for Floppy IRQ (see PnP IRQ routing

table)

Offset 52 - PNP IRQ Routing 2 ........................................RW

7-4

PnP Routing for Serial Port 2 IRQ (see PnP IRQ

routing table)

3-0

PnP Routing for Serial Port 1 IRQ (see PnP IRQ

routing table)

Offset 54 - PCI IRQ Edge / Level Select..........................RW

7-4

Reserved

........................................ always reads 0

The following bits all default to “level” triggered (0)

PIRQA# Invert (edge) / Non-invert (level).......(1/0)

PIRQB# Invert (edge) / Non-invert (level).......(1/0)

PIRQC# Invert (edge) / Non-invert (level).......(1/0)

PIRQD# Invert (edge) / Non-invert (level).......(1/0)

Note:

PIRQA-D# normally connect to PCI interrupt pins

INTA-D# (see pin definitions for more information).

Offset 55 - PNP IRQ Routing 4 ........................................RW

7-4

PIRQA# Routing (see PnP IRQ routing table)

3-0

Reserved

........................................ always reads 0

Offset 56 - PNP IRQ Routing 5 ........................................RW

7-4

PIRQC# Routing (see PnP IRQ routing table)

3-0

PIRQB# Routing (see PnP IRQ routing table)

Offset 57 - PNP IRQ Routing 6 ........................................RW

7-4

PIRQD# Routing (see PnP IRQ routing table)

3-0

Reserved

........................................ always reads 0

PnP IRQ Routing Table

0000 Disabled ................................................. default

0001 IRQ1

0010 Reserved

0011 IRQ3

0100 IRQ4

0101 IRQ5

0110 IRQ6

0111 IRQ7

1000 Reserved

1001 IRQ9

1010 IRQ10

1011 IRQ11

1100 IRQ12

1101 Reserved

1110 IRQ14

1111 IRQ15

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