AMD Geode LX 800@0.9W - Manual (Page 335)

AMD Geode™ LX Processors Data Book 335
Display Controller Register Descriptions 33234H
6.6.7 Palette Access FIFO Diagnostic Registers
The Palette Access registers are used for accessing the internal palette RAM and extensions. In addition to the standard
256 entries for color translation, the palette has extensions for cursor colors and overscan (border) color.
The diagnostics registers enable testability of the display FIFO and compression FIFO.
6.6.7.1 DC Palette Address (DC_PAL_ADDRESS)
This register should be written with the address (index) location to be used for the next access to the (DC_PAL_DATA regis-
ter DC Memory Offset 074h).
DC Memory Offset 070h
Type
R/W
Reset Value xxxxxxxxh
DC_PAL_ADDRESS Register Map
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RSVD PAL_ADDR
DC_PAL_ADDRESS Bit Descriptions
Bit Name Description
31:9 RSVD Reserved.
8:0 PAL_ADDR PAL Address. This 9-bit field specifies the address to be used for the next access to the
DC_PAL_DATA register (DC Memory Offset 074h). Each access to the data register auto-
matically increments the palette address register. If non-sequential access is made to the
palette, the address register must be loaded between each non-sequential data block. The
address ranges are as follows:
Address Color
0h - FFh Standard Palette Colors
100h Cursor Color 0
101h Cursor Color 1
102h RSVD
103h RSVD
104h Overscan Color
105h - 1FFh Not Valid
Note that in general, 24-bit values are loaded for all color extensions. However, if a 16-bpp
mode is active, only the appropriate most significant bits are used (5:5:5 or 5:6:5).