CS5530 datasheet(213/241 Pages) NSC

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Table 4-28. Programmable Interrupt Controller Registers

Bit

Description

I/O Port 020h / 0A0h (WO)

Master / Slave PIC IWC1

7:5

Reserved: Set to 0.

Reserved: Set to 1.

Trigger Mode: 0 = Edge; 1 = Level.

Vector Address Interval: 0= 8byteintervals; 1 = 4 byte intervals.

Reserved: Set to 0 (cascade mode).

Reserved: Set to 1 (ICW4 must be programmed).

I/O Port 021h / 0A1h (WO)

Master / Slave PIC ICW2

(after ICW1 is written)

7:3

A[7:3]: Address lines [7:3] for base vector for interrupt controller.

2:0

Reserved: Set to 0.

I/O Port 021h / 0A1h (WO)

Master / Slave PIC ICW3

(after ICW2 is written)

Master PIC ICW3

7:0

Cascade IRQ: Must be 04h.

Slave PIC ICW3

7:0

Slave ID: Must be 02h.

I/O Port 021h / 0A1h (WO)

Master / Slave PIC ICW4

(after ICW3 is written)

7:5

Reserved: Set to 0.

Special Fully Nested Mode: 0 = Disable; 1 = Enable.

3:2

Reserved: Set to 0.

Auto EOI: 0 = Normal EOI; 1 = Auto EOI.

Reserved: Set to 1 (8086/8088 mode).

I/O Port 021h / 0A1h (R/W)

Master / Slave PIC OCW1

(except immediately after ICW1 is written)

IRQ7 / IRQ15 Mask: 0 = Not Masked; 1 = Mask.

IRQ6 / IRQ14 Mask: 0 = Not Masked; 1 = Mask.

IRQ5 / IRQ13 Mask: 0 = Not Masked; 1 = Mask.

IRQ4 / IRQ12 Mask: 0 = Not Masked; 1 = Mask.

IRQ3 / IRQ11 Mask: 0 = Not Masked; 1 = Mask.

IRQ2 / IRQ10 Mask: 0 = Not Masked; 1 = Mask.

IRQ1 / IRQ9 Mask: 0 = Not Masked; 1 = Mask.

IRQ0 / IRQ8 Mask: 0 = Not Masked; 1 = Mask.

I/O Port 020h / 0A0h (WO)

Master / Slave PIC OCW2

7:5

Rotate/EOI Codes:

000 = Clear rotate in Auto EOI mode

100 = Set rotate in Auto EOI mode

001 = Non-specific EOI

101 = Rotate on non-specific EOI command

010 = No operation

110 = Set priority command (bits [2:0] must be valid)

011 = Specific EOI (bits [2:0] must be valid)

111 = Rotate on specific EOI command (bits [2:0] must be valid)

4:3

Reserved: Set to 0.

2:0

IRQ Number (000-111)

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