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Bitfields for OPTi 82C750 Vendetta (device 1) interrupt control

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Bit Description

15

ISA IRQ14 blocking enable

14

ISA IRQ15 blocking enable

13

DMA/ISA master to preempt PCI master enable

12

PCI priority is fixed instead of rotating

11 - 10

back-to-back ISA I/O delay
00 = 3 ATCLKs
01 = 12 ATCLKs
10 = no delay
11 = delay all by 12 ATCLKs

9

PCI master ISA device access disable

8

ISA bus control signals for memory access >16M and I/O access >64K disable

7 - 6

IRQ15 - IRQ14 triggering:
0 = edge
1 = level

5 - 2

IRQ12 - IRQ9 triggering:
0 = edge
1 = level

1

IRQ5 triggering:
0 = edge
1 = level

0

pin AE16 functionality:
0 = DREQ6
1 = EPMI0#

See Also:

#00939,#00940