PC87413 datasheet(41/257 Pages) NSC

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3.0 Device Architecture and Configuration (Continued)

Revision 1.2

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Table 13. Interrupt Conﬁguration Registers

Table 14. DMA 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 (SCI or wake-up) 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 register (see Section 9.4.11 on

page 211).

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 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 PC8741x 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 0 - Type of interrupt request selected in previous register

0: Edge

1: Level

Bit 1 - Polarity of interrupt request selected in previous register

0: Low polarity

1: High polarity

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 7-3 - Reserved.

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.

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

Devices, as it causes the PC8741x device to behave unpredictably.

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 7-3 - Reserved.

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.

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

Devices, as it causes the PC8741x device to behave unpredictably.

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