CS5535 datasheet(103/555 Pages) NSC

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4.8

PROGRAMMABLE INTERRUPT CONTROL

The Programmable Interrupt Control subsystem (PIC) is

illustrated in Figure 4-18. The major modules are the Map-

per and Masks (MM), Extended PIC (XPIC), and Legacy

8259A PIC (LPIC).

Features

• Two x86 compatible 8259As

• 15-Level Priority Controller

• Programmable Interrupt Modes

• Individual Request Mask Capability

• Individual Edge/Level Controls

• Complete 8259A state read back via shadow registers

• Mapper routes 62 inputs to 15 legacy interrupts and one

Asynchronous System Management Interrupt (ASMI)

• All 62 inputs individually maskable and status readable

(MSRs

51400020h-51400027h or PIC I/O Offsets 00h-

1Ch, see Section 5.9.1 on page 333)

4.8.1

Mapper and Masks

This block maps and masks up to 62 interrupt sources to

60 discrete Extended PIC (XPIC) inputs. The sources are

organized into four groups:

15 Primary pre-defined inputs (see Table 4-12)

15 LPC inputs pre-defined (see Table 4-12)

16 Unrestricted Y inputs (see Table 4-13)

16 Unrestricted Z inputs (see Table 4-14)

The outputs are organized into 16 groups of four signals

each, except groups 0 and 2; they have two signals each.

Each group is called an Interrupt Group (IG). Each pre-

defined input is mapped to a specific IG. Each unrestricted

input can be mapped to any IG except IG0. Regardless of

mapping, any interrupt source can be masked to prevent

participation in the interrupt process. Once the input to out-

put map is established along with the mask values, signal

flow from input to output is always completely combina-

tional.

Figure 4-18. PIC Subsystem

Primary Input 0

Primary Input 1

Primary Input 3

Primary Input 4

Primary Input 15

LPC Input 0

LPC Input 1

LPC Input 3

LPC Input 4

LPC Input 15

Unrestricted Y Input 0

Unrestricted Y Input 1

Unrestricted Y Input 2

Unrestricted Y Input 3

Unrestricted Y Input 15

Unrestricted Z Input 0

Unrestricted Z Input 1

Unrestricted Z Input 2

Unrestricted Z Input 3

Unrestricted Z Input 15

Mapper

and

Masks

(MM)

IG0 (Note)

IG1

IG2 (Note)

IG3

IG4

IG5

IG6

IG7

IG8

IG9

IG10

IG11

IG12

IG13

IG14

IG15

IRQ0

IRQ1

(IRQ2)

IRQ3

IRQ4

IRQ5

IRQ6

IRQ7

IRQ8

IRQ9

IRQ10

IRQ11

IRQ12

IRQ13

IRQ14

IRQ15

Extended

PIC

(XPIC)

Legacy

8259A

PICs

(LPIC)

ASMI

INTR

Note:

The outputs are organized into 16 groups of four signals each, except IG0 and IG2; they have two signals each.

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