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

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Bit Description

7 - 6

serial interrupt control mode:
00 = continuous
01 = idle
1x = active

5

reserved

4

data frame slot support:
0 = 17 slots (IRQ15-IRQ3, IRQ1-IRQ0, SMI#, IOCHK#)
1 = 21 slots (IRQ15-IRQ3, IRQ1-IRQ0, SMI#, IOCHK#, PCIRQ3#-PCIRQ0#)

3 - 2

CPU access PCI priority:
00 = lowest
01 = higher after 4 PCI master grants
10 = higher after 2 PCI master grants
11 = higher after 3 PCI master grants

1 - 0

serial interrupt start frame pulse width in continuous/active mode:
00 = 4/3 CLK
01 = 6/5 CLK
10 = 8/7 CLK
11 = reserved

See Also:

#00939,#00952