SC2200 datasheet(164/433 Pages) NSC

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164

Revision 3.0

Core Logic Module (Continued)

5.2.6.3

Programmable Interrupt Controller

The Core Logic module contains two 8259A-equivalent

programmable interrupt controllers, with eight interrupt

request lines each, for a total of 16 interrupts. The two con-

trollers are cascaded internally, and two of the interrupt

request inputs are connected to the internal circuitry. This

allows a total of 13 externally available interrupt requests.

SeeFigure5-9.

Each Core Logic IRQ signal can be individually selected to

as edge- or level-sensitive. The four PCI interrupt signals

may be routed internally to any PIC IRQ.

Figure 5-8. PIC Interrupt Controllers

Three interrupts are available externally depending upon

selected ball multiplexing:

IRQ15 (muxed with GPIO11+RI2#),

IRQ14 (muxedwithTFTD1), and

IRQ9 (muxed with IDE_DATA6)

More of the IRQs are available through the use of SERIRQ

(muxed with GPIO39) function. See Table 5-4.

The Core Logic module allows PCI interrupt signals INTA#,

INTB#, INTC# (muxed with GPIO19+IOCHRDY) and

INTD#(muxedwith IDE_DATA7) toberoutedinternally to

any IRQ signal. The routing can be modified through Core

Logic module’s configuration registers. If this is done, the

IRQ input must be configured to be level- rather than edge-

sensitive. IRQ inputs may be individually programmed to be

active low, level-sensitive with the Interrupt Sensitivity con-

figuration registers at I/O address space 4D0h and 4D1h.

PCI interrupt configuration is discussed in further detail in

“PCI Compatible Interrupts” on page 165.

IR0

IR1

IR2

IR3

IR4

IR5

IR6

IR7

IRQ0

IRQ1

IRQ2

IRQ3

IRQ4

IRQ5

IRQ6

IRQ7

Internal

FPU

8254 Timer 0

RTC_IRQ#

IR0

IR1

IR2

IR3

IR4

IR5

IR6

IR7

IRQ8#

IRQ9

IRQ10

IRQ11

IRQ12

IRQ13

IRQ14

IRQ15

INTR

Table 5-4. PIC Interrupt Mapping

Master

IRQ

Mapping

IRQ0

Connected to the OUT0 (system timer) of

the internal 8254 PIT.

IRQ2

Connected to the slave’s INTR for a cas-

caded configuration.

IRQ8#

Connected to internal RTC.

IRQ13

Connected to the FPU interface of the

GX1 module.

IRQ15

Interrupts available to other functions

IRQ14

IRQ12

IRQ11

IRQ10

IRQ9

IRQ7

IRQ6

IRQ5

IRQ4

IRQ3

IRQ1

SC2200 Datasheet(PDF) 164 Page - National Semiconductor (TI)

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