PC87365 datasheet(35/215 Pages) NSC

35 / 215 page

2.0 Device Architecture and Configuration (Continued)

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Table 10. Interrupt Conﬁguration Registers

Table 11. DMA Conﬁguration Registers

Table 12. Special Logical Device Conﬁguration Registers

Index

Description

70h

Interrupt Number

and Wake-Up on

IRQ Enable

Sets IRQ, indicates the selected interrupt number and enables wake-up on IRQ.

Bit 4 - Enables wake-up on the IRQ of the logical device. When enabled, IRQ

assertion triggers a wake-up event.

0: Disabled (default)

1: Enabled

Bits 3-0 select the interrupt number. A value of 1 selects IRQL1. A value of 15

selects IRQL15. IRQL0 is not a valid interrupt selection and represent no interrupt

selection.

Note: If the BIOS routine that sets IRQ does not use a Read-Modify-Write

sequence, it might reset bit 4. To ensure that the system wakes up, the BIOS must

set bit 4 before the system goes to sleep.

71h

Interrupt Request

Type Select

Indicates the type and level of the interrupt request level selected in the previous

If a logical device supports only one type of interrupt, this register may be read

only.

Bits 7-2 - Reserved.

Bit 1 - Level of the interrupt request selected in the previous register

0: Low polarity

1: High polarity

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

0: Edge

1: Level

Index

Description

74h

DMA Channel

Select 0

Indicates selected DMA channel for DMA 0 of the logical device (0 - The ﬁrst DMA

channel in case of using more than one DMA channel).

Bits 2-0 select the DMA channel for DMA 0. The valid choices are 0-3, where a

value of 0 selects DMA channel 0, 1 selects channel 1, etc.

A value of 4 indicates that no DMA channel is active.

The values 5-7 are reserved.

75h

DMA Channel

Select 1

Indicates selected DMA channel for DMA 1 of the logical device (1 - The second

DMA channel in case of using more than one DMA channel).

Bits 2-0 select the DMA channel for DMA 1. The valid choices are 0-3, where a

value of 0 selects DMA channel 0, 1 selects channel 1, etc.

A value of 4 indicates that no DMA channel is active.

The values 5-7 are reserved.

Index

Description

F0h-FEh

Logical Device

Conﬁguration

Special (vendor-deﬁned) conﬁguration options.

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