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384 AMD Geode™ LX Processors Data Book
Display Controller Register Descriptions
33234H
6.6.22.4 Video DAC Palette Mask
6.6.23 VGA Block Extended Registers
The Extended registers are accessed by writing an index value to the CRTC Index register (3B4h or 3D4h) and reading or
writing the register using the CRTC Data register (3B5h or 3D5h). See the description of the I/O Address Select bit in the
Section 6.6.17.1 "VGA Miscellaneous Output" on page 356 for more information on the I/O address of the CRTC registers.
Read Address 3C6h
Write Address 3C6h
Typ e R /W
Reset Value 00h
Video DAC Palette Mask Register Bit Descriptions
Bit Name Description
7:0 PAL_MSK Palette Mask. These bits enable their respective color bits between the final VGA 8-bit
pixel output and the DAC palette. The bits are ANDed with the incoming VGA pixel value
and the result used to address the palette RAM.
Table 6-59. Extended Registers Summary
Index Type Register Reset Value Reference
0030h R/W ExtendedRegisterLock FFh Page 385
043h R/W
(Note 1)
Note 1. R/W when unlocked, RO otherwise (see Section 6.6.23.1 "ExtendedRegisterLock" for details).
ExtendedModeControl 00h Page 385
044h R/W
(Note 1)
ExtendedStartAddress 00h Page 385
047h R/W
(Note 1)
WriteMemoryAperture 00h Page 386
048h R/W
(Note 1)
ReadMemoryAperture 00h Page 386
060h R/W
(Note 1)
BlinkCounterCtl (for Sim/Test) 00h Page 386
061h R/W
(Note 1)
BlinkCounter (for Sim/Test) 00h Page 387
070h R/W
(Note 1)
VGALatchSavRes 00h Page 387
071h R/W
(Note 1)
DACIFSavRes 00h Page 387