PC87317 datasheet(32/272 Pages) NSC

32 / 272 page

Configuration

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TABLE 2-8. Plug and Play (PnP) Interrupt Conﬁguration Registers

TABLE 2-9. Plug and Play (PnP) DMA Conﬁguration Registers

TABLE 2-10. Plug and Play (PnP) Logical Device Conﬁguration Registers

Index

Name

Deﬁnition

70h

Interrupt Request

Level Select 0

Read/write value indicating selected interrupt level.

Bits3-0 select the interrupt level used for interrupt 0. A value of 1 selects IRQL 1, a value

of 15 selects IRQL 15. IRQL 0 is not a valid interrupt selection and (represents no

interrupt selection.

71h

Interrupt Request

Type Select 0

Read/write value that indicates the type and level of the interrupt request level selected in

the previous register.

If a card supports only one type of interrupt, this register may be read-only.

Bit 0 - Type of the interrupt request selected in the previous register.

0: Edge

1: Level

Bit1 - Level of the interrupt request selected in the previous register. (See also Section

13.1 on page 231).

0: Low polarity. (Implies open-drain output with strong pull-up for a short time, followed

by weak pull-up).

1: High polarity. (Implies push-pull output).

Index

Name

Deﬁnition

74h

DMA Channel

Select 0

Read/write value indicating selected DMA channel for DMA 0.

Bits 2-0 select the DMA channel for DMA 0. A value of 0 selects DMA channel 0; a

value of 7 selects DMA channel 7.

Selecting DMA channel 4, the cascade channel, indicates that no DMA channel is

active.

75h

DMA Channel

Select 1

Read/write value indicating selected DMA channel for DMA 1

Bits 2-0 select the DMA channel for DMA 1. A value of 0 selects DMA channel 0; a

value of 7 selects DMA channel 7.

Selecting DMA channel 4, the cascade channel, indicates that no DMA channel is

active.

Index

Name

Deﬁnition

F0h-FEh

Logical Device

Conﬁguration Vendor

Deﬁned

Vendor deﬁned.

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