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Bitfields for Intel 82378/82379 PCI Control

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Bit Description

7

reserved (0)

6

DMA Reserved Page Register Aliasing Control
0 = alias PORT 80h-8Fh to PORT 90h-9Fh

5

Interrupt Acknowledge Enable
0 = ignore INTA cycles on the PCI bus, but still allow 8259 register access and poll-mode functions

4 - 3

Subtractive Decoding Sample Point
00 = slow sample point
01 = typical
10 = fast sample point
11 = reserved

2

PCI Posted Write Buffer Enable

1

ISA Master Line Buffer Configuration
0 = single-transaction mode
1 = eight-byte mode for ISA bus master transfers

0

DMA Line Buffer Configuration
0 = single-transaction mode
1 = eight-byte mode

See Also:

#01064,#01066