Interrupt Handling

interrupt can be routed to the same ISA IRQ line. The PIB can be programmed to handle the PCI interrupts if the RavenMPIC is either not present or not used.

The following figure shows the interrupt structure of the PIB.

PIRQ0_

PIRQ1_

PIRQ2_

PIRQ3_

PIRQ Route

Control Register

PIRQ Route

Control Register

PIRQ Route

Control Register

PIRQ Route

Control Register

IRQx

IRQx

IRQx

IRQx

Timer1/Counter0

 

 

0

 

 

IRQ1

 

 

1

 

 

2

 

 

IRQ3

 

 

3

Controller 1

INTR

IRQ4

(INT1)

 

4

 

 

IRQ5

 

 

5

 

 

IRQ6

 

 

6

 

 

IRQ7

 

 

7

 

 

IRQ8

 

 

0

 

 

IRQ9

 

 

1

 

 

IRQ10

 

 

2

 

 

IRQ11

 

 

3

Controller 2

 

IRQ12

(INT2)

 

4

 

 

IRQ13

 

 

5

 

 

IRQ14

 

 

6

 

 

IRQ15

 

 

7

 

 

 

 

1897 9609

5

Figure 5-2. PIB Interrupt Handler Block Diagram

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Image 249
Motorola MVME2300 Series manual PIB Interrupt Handler Block Diagram