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Bitfields for Intel 82443EX/LX (Device 0) PAC Configuration register

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Bit Description

15

WSC# Handshake Disable

14

(82443LX) Host Frequency (read-only)
0 = 66MHz
1 = 60MHz

14

(82443EX) reserved

13 - 12

reserved

11

??? (Not documented by Intel!)

10

PCI Agent to Arperture Access Disable

9

Aperture Access Global Enable

8 - 6

(82443EX) reserved

8 - 7

(82443LX) DRAM Data Integrety Mode
00 = Non-ECC (no check, no correct)
01 = EC-only (do check, no correct)
10 = reserved
11 = ECC (do check, do correct)

6

(82443LX) ECC-Test Diagnostic Mode Enabled

5

MDA Present
Note: Controls routing of Monochrome Display Adaptor I/O and memory range accesses. Works in conjunction with the VGA-bit in Bridge Control register of device 1 (see #00901):
VGA MDA
0 0 MDA and VGA routed to PCI bus
0 1 reserved
1 0 MDA and VGA routed to AGP bus
1 1 VGA routed to AGP bus, MDA routed to PCI bus

4 - 0

reserved

See Also:

#00901,#01129