PC97338 datasheet(191/221 Pages) NSC

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6.2

INTERRUPT SUPPORT

6.2.1

Legacy Mode

Tables 100 and 101 describe the possible interrupt

source for each IRQ, in legacy mode. A plus sign (

means this is a possible interrupt source and a minus

sign (

−) means it is not.

Table 101 also indicates the conditions that must be

true to enable IRQ 5, 12 and 15. All conditions in the

row (horizontally) must be true to enable the interrupt.

An x indicates the value does not matter.

It is illegal to configure two or more devices to the

same ISA interrupt, with the exception of SCC1 and

SCC2 which can be configured to the same ISA inter-

rupt. An ISA interrupt may be configured to a specific

device only when the device is disabled.

Table 102 describes the conditions under which each

interrupt is put in TRI-STATE, in Legacy mode.

For each interrupt to be put in TRI-STATE, every col-

umn must have one true condition. If no condition is

true in any one column, the signal will not be put in

TRI-STATE.

TABLE 100. Interrupt Support in Legacy Mode for IRQ3, 4, 6, 7, 9 10 and 11

TABLE 101. Interrupt Support in Legacy Mode for IRQ 5, 12 and 15

Interrupt

Possible Interrupt Source

SCC1

SCC2

Parallel Port

FDC

SIRQIn

a. n = 1, 2 or 3

IRQ3,4

+−−+

IRQ6

−

−−++

IRQ7

−

−+−+

IRQxb

b. x = 9, 10 or 11

−

−−−+

Interrupt

Conditions

Possible Interrupt Source

Bit 0 of

ASC

Bit 3 of

SCF3

Bits 7,6

SIRQI1

Reset

Value of

CFG0

SCC1

SCC2

Parallel

Port

FDC

SIRQI1 SIRQI2 SIRQI3

IRQ5

−−+−++

−−−−−−

−

IRQ12

−−−−++

−−−−−−

−

−−−−−−

−

IRQ15

0 0

−−−−−+

0 1

−−−−−−

−

1 x

−−−−−−

−

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