PC87373 datasheet(37/174 Pages) NSC

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3.0 Device Architecture and Configuration (Continued)

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Table 12. Interrupt Conﬁguration Registers

Index

Description

70h

Interrupt Number

and Wake-Up on

IRQ Enable

Indicates selected interrupt number.

Bits 7-5: Reserved.

Bit 4:

Enables a Power Management event (SIOPME) from the IRQ of the

logical device. When enabled, IRQ assertion sets the respective

XXX_IRQ_STS bit (XXX is MOD, MS or KBD) in the GPE1_STS_3

0: Disabled (default)

1: Enabled

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.

Bits 3-0: These bits select the interrupt number. A value of 1 selects IRQ1. A value

of 15 selects IRQ15. IRQ0 is not a valid interrupt selection and represents

no interrupt selection.

Note: Avoid selecting the same interrupt number (except 0) for different Logical

Devices, as it causes the PC87373 device to behave unpredictably.

71h

Interrupt Request

Type Select

Indicates the type and polarity of the interrupt request number selected in the

previous register. If a logical device supports only one type of interrupt, the

corresponding bit is read only.

Bits 7-2: Reserved.

Bit 1:

Polarity of interrupt request selected in previous register

0: Low polarity

1: High polarity

Bit 0:

Type of interrupt request selected in previous register

0: Edge

1: Level

Table 13. DMA Conﬁguration Registers

Index

Description

74h

DMA Channel

Select 0

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

channel if more than one DMA channel is used).

Bits 7-3: Reserved.

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

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.

Note: Avoid selecting the same DMA channel (except 4) for different logical

devices, as it causes the PC87373 device to behave unpredictably.

75h

DMA Channel

Select 1

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

DMA channel if more than one DMA channel is used).

Bits 7-3: Reserved.

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

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.

Note: Avoid selecting the same DMA channel (except 4) for different logical

devices, as it causes the PC87373 device to behave unpredictably.

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