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

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Bit Description

15

pin functionality:
0 = AE22:IRQ3, AF21:IRQ5, AE21:IRQ6, AD21:IRQ7, AE20:IRQ9, AF19:IRQ11
1 = AE22:MIRQ3/5, AF21:MIRQ7/9, AE21:MIRQ11/15, AD21:EPMI1#, AE20:EPMI2#, AF19:GMIRQ

14

pin R22 functionality:
0 = PREQ2#
1 = EPMI0#

13

IRQ1 latching enable

12

IRQ12 latching enable

11

DACKEN# status:
0 = active low
1 = active high

10

system bus owned by external device

9

flash ROM locking enable

8

reserved

7

IRQ6 triggering:
0 = edge
1 = level

6 - 3

IRQ generation when GMIRQ triggered
0000 = disabled
0001 = reserved
0010 = reserved
0011 = IRQ3
0100 = IRQ4
0101 = IRQ5
0110 = IRQ6
0111 = IRQ7
1000 = reserved
1001 = IRQ9
1010 = IRQ10
1011 = IRQ11
1100 = IRQ12
1101 = reserved
1110 = IRQ14
1111 = IRQ15

2

reserved (1)

1

priority scheme enable

0

concurrent refresh and IDE cycle enable

See Also:

#00939,#00949