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458 AMD Geode™ LX Processors Data Book
Video Processor Register Descriptions
33234H
6.8.3.48 Dither Memory Data (DMD)
6.8.3.49 Panel CRC Signature (CRC)
VP Memory Offset 450h
Typ e R /W
Reset Value 00000000_00000000h
DMD Register Map
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
RSVD
313029282726252423222120191817161514131211109876543210
RDAT
DMD Bit Descriptions
Bit Name Description
63:32 RSVD (RO) Reserved (Read Only). Reads back as 0.
31:0 RDAT RAM Data. This 32-bit field contains the read or write data for the RAM access.
VP Memory Offset 458h
Typ e R /W
Reset Value 00000000_00000000h
CRC Register Map
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
RSVD
313029282726252423222120191817161514131211109876543210
RSVD FRCT
SIGVAL
SIGFR
SIGEN
CRC Bit Descriptions
Bit Name Description
63:9 RSVD (RO) Reserved (Read Only). Reads back as 0.
8:3 FRCT (RO) Frame Count (Read Only). Represents the frame count, which is an index for the gener-
ated signature for that frame.
2 SIGVAL (RO) Signature Valid (Read Only). If this bit is set, the signature operation has completed
and the signature may be safely read from the 32-Bit Panel CRC Register (VSP Memory
Offset 468h).
1SIGFR Signature Free Run. If this bit is high, with signature enabled (bit 0 = 1), the signature
generator captures data continuously across multiple frames. This bit may be set high
when the signature is started, then later set low, which causes the signature generation
process to stop at the end of the current frame.
0: Capture signature for only one frame.
1: Free run across multiple frames.
0SIGEN Signature Enable. Enables/disables signature capture.
1: Enable signature capture.
0: Disable signature capture.