32581CCore Logic Module - ISA Legacy Register Space

 

 

 

Table 6-49. Miscellaneous Registers (Continued)

 

Bit

 

Description

 

 

 

 

 

3

 

IRQ3 Edge or Level Sensitive Select. Selects PIC IRQ3 sensitivity configuration.

 

 

 

0: Edge.

 

 

 

1:

Level.

 

 

 

 

 

2:0

 

Reserved. Must be set to 0.

 

 

 

 

 

 

I/O Port 4D1h

Interrupt Edge/Level Select Register 2 (R/W)

Reset Value: 00h

Notes: 1. If ICW1 - bit 3 in the PIC is set as level, it overrides the setting for bits 7:6 and 4:1 in this register.

 

 

2. Bits [7:6] and [4:1] in this register are used to configure a PCI interrupt mapped to IRQ[x] on the PIC as level-sensitive

 

 

(shared).

 

 

 

 

 

7

 

IRQ15 Edge or Level Sensitive Select. Selects PIC IRQ15 sensitivity configuration.

 

 

 

0: Edge.

 

 

 

1:

Level.

 

 

 

 

 

6

 

IRQ14 Edge or Level Sensitive Select. Selects PIC IRQ14 sensitivity configuration.

 

 

 

0: Edge.

 

 

 

1:

Level.

 

 

 

 

 

5

 

Reserved. Must be set to 0.

 

 

 

 

 

4

 

IRQ12 Edge or Level Sensitive Select. Selects PIC IRQ12 sensitivity configuration.

 

 

 

0: Edge.

 

 

 

1:

Level.

 

 

 

 

 

3

 

IRQ11 Edge or Level Sensitive Select. Selects PIC IRQ11 sensitivity configuration.

 

 

 

0: Edge.

 

 

 

1:

Level.

 

 

 

 

 

2

 

IRQ10 Edge or Level Sensitive Select. Selects PIC IRQ10 sensitivity configuration.

 

 

 

0: Edge.

 

 

 

1:

Level.

 

 

 

 

 

1

 

IRQ9 Edge or Level Sensitive Select. Selects PIC IRQ9 sensitivity configuration.

 

 

 

0: Edge.

 

 

 

1:

Level.

 

 

 

 

 

0

 

Reserved. Must be set to 0.

 

 

 

 

 

 

308

AMD Geode™ SC3200 Processor Data Book

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AMD SC3200 manual Bit Description, 308