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AMD Geode™ LX Processors Data Book
Graphics Processor Register Definitions
33234H
6.4.2.25 LUT Index (GP_LUT_INDEX)
This register is used to initialize the LUT_INDEX pointer that is used for subsequent LUT operations. All LUT accesses are
DWORD accesses so only the 9 LSBs of the pointer are used to index into the 2 KB LUT. Addresses 000h-0FFh are used
for 8-bit indexed LUT data. Addresses 000h-00Fh are used for 4-bit indexed LUT data. Addresses 100h-13Fh are used for
storing color patterns. All addresses are used for storing incoming data (unless the PL bit is set in the
GP_CH3_MODE_STR register, GP Memory Offset 64h[20]), but none of the remaining addresses have any significance to
software.
DWORD accesses so only the 9 LSBs of the pointer are used to index into the 2 KB LUT. Addresses 000h-0FFh are used
for 8-bit indexed LUT data. Addresses 000h-00Fh are used for 4-bit indexed LUT data. Addresses 100h-13Fh are used for
storing color patterns. All addresses are used for storing incoming data (unless the PL bit is set in the
GP_CH3_MODE_STR register, GP Memory Offset 64h[20]), but none of the remaining addresses have any significance to
software.
6.4.2.26 LUT Data (GP_LUT_DATA)
This register is used to store data into the LUT for indexed color translations and color patterns. The 32 bits written to this
register are stored in the LUT at the location specified in the GP_LUT_INDEX register (GP Memory Offset 70h). A read of
this register returns the contents of the LUT at the location specified by the GP_LUT_INDEX register. Either a read or write
of this register will cause the GP_LUT_INDEX register to increment, so the LUT can be loaded through successive writes to
the GP_LUT_DATA register.
register are stored in the LUT at the location specified in the GP_LUT_INDEX register (GP Memory Offset 70h). A read of
this register returns the contents of the LUT at the location specified by the GP_LUT_INDEX register. Either a read or write
of this register will cause the GP_LUT_INDEX register to increment, so the LUT can be loaded through successive writes to
the GP_LUT_DATA register.
GP Memory Offset 70h
Type
Type
R/W
Reset Value
00000000h
GP_CH3_HSRC 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
LUT_INDEX
GP_CH3_HSRC Bit Descriptions
Bit
Name
Description
31:9
RSVD
Reserved.
8:0
LUT_INDEX
LUT Index. Used to initialize the LUT_INDEX pointer that is used for subsequent LUT
operations. The LUT_INDEX automatically increments on a write to the GP_LUT_DATA
register (GP Memory Offset 74h). When performing a read, bit 31 must be set to cause
the hardware to perform the read and update the GP_LUT_DATA register. If this bit is not
set, then a write is assumed and the read will not be performed.
operations. The LUT_INDEX automatically increments on a write to the GP_LUT_DATA
register (GP Memory Offset 74h). When performing a read, bit 31 must be set to cause
the hardware to perform the read and update the GP_LUT_DATA register. If this bit is not
set, then a write is assumed and the read will not be performed.
GP Memory Offset 74h
Type
Type
R/W
Reset Value
xxxxxxxxh
GP_CH3_HSRC 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
LUT_DATA
GP_CH3_HSRC Bit Descriptions
Bit
Name
Description
31:0
LUT_DATA
LUT_DATA. Used to store data into the LUT for indexed color translations and color pat-
terns.
terns.