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Bitfields for Intel 82434LX/NX Frame Buffer Range register

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Bit Description

31 - 20

buffer offset (in 1MB increments; must be multiple of buffer set set by bits 3-0)

19 - 14

reserved

13

enable byte merging

12

128K VGA-range Attribute Enable when set, bits 13,9,7 also apply to VGA memory range (Axxxx-Bxxxx)

11 - 10

reserved

9

no lock requests

8

reserved

7

enable transparent bufer writes

6 - 4

reserved

3 - 0

buffer size in MB (less 1); must be power of 2

Note:

If bits 31-20=0, the frame buffer feature is disabled.

See Also:

#01055