VT8235 datasheet(70/145 Pages) VIA

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VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-64-

Device 17 Function 0 Bus Control Registers

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Miscellaneous Control

Offset 4C - IDE Interrupt Routing (04h) ........................RW

7-6

I/O Recovery Time Select

When Rx40[6] is enabled, this field determines the

I/O recovery time.

00 1 Bus Clock ........................................... default

01 2 Bus Clock

10 4 Bus Clock

11 8 Bus Clock

5-4

Reserved (do not program)

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

3-2

IDE Secondary Channel IRQ Routing

00 IRQ14

01 IRQ15.................................................... default

10 IRQ10

11 IRQ11

1-0

IDE Primary Channel IRQ Routing

00 IRQ14.................................................... default

01 IRQ15

10 IRQ10

11 IRQ11

Note: IRQ Routing to the APIC is fixed as follows:

INTA# => IRQ16

INTB# => IRQ17

INTC# => IRQ18

INTD# => IRQ19

IDE IRQ => IRQ20

USB1 IRQ => IRQ21

USB2 IRQ => IRQ21 if Rx59[5] = 0

=> IRQ23 if Rx59[5] = 1

AC97 / MC97 IRQ => IRQ22

Table 10. APIC Fixed IRQ Routing

Offset 4E - Internal RTC Test Mode............................... RW

7-5

Reserved

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

Last Port 70/74 Written Status

Last write was to port 70 ....................... default

Last write was to port 74

Extra RTC Port 74/75

The RTC is normally accessed though ports 70/74.

This bit controls whether two extra ports (74 / 75)

can be used to access the RTC.

Disable ................................................... default

Enable

2-0

Reserved (Do Not Program)

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

Offset 4F – PCI Bus and CPU Interface Control ........... RW

7-4

Reserved

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

CPU Reset Source

This bit determines whether CPU Reset (generated

through port 92 or the keyboard) uses INIT or

CPURST.

Use CPURST as CPU Reset .................. default

Use INIT as CPU Reset

Reserved (Do Not Program)

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

Reserved

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

Software PCI Reset

......write 1 to generate PCI reset

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