AMD Geode LX 600@0.7W Data Book page 274

33234H
Bit Name
29 X
28 Y
27:24 BPP/FMT
23 RO
22 BGR
21 PM
20 PL
19 PE
18 HS
17:16 RSVD
15:0 STRIDE
274
GP_CH3_MODE_STR Bit Descriptions (Continued)
Description
X Direction for Fetch. Data is reversed if fetch direction does not match destination
direction.
0: Left to right direction.
1: Right to left direction.
Y Direction for Fetch. Data is reversed if fetch direction does not match destination
direction.
0: Top to bottom direction.
1: Bottom to top direction.
Color Depth and Format of Input.
0000: 8-bpp 3:3:2.
0001: 8-bpp indexed.
0010: 8-bpp alpha.
0100: 16-bpp 4:4:4:4.
0110: 16-bpp 0:5:6:5.
0111: 4:2:2 YUV.
1000: 32-bpp.
1011: 24-bpp packed.
1101: 4-bpp indexed.
1110: 4-bpp alpha.
All others: Undefined.
Rotate Bitmap.
0: Disable rotation.
1: Enable rotation direction determined by X and Y. See Section 6.3.2.1 "Rotating BLTs"
on page 242.
BGR Mode (applies only when 16-bpp or 32-bpp).
0: Pass through (or YUY2 for 4:2:2 mode).
1: Swap red and blue channels on output (or UYVY for 4:2:2 mode).
Pattern Mode.
0: Bitmap mode, data from memory or host source.
1: Pattern mode.
Preserve LUT Data.
0: Entire 2K buffer available for fetch data.
1: 1K reserved for LUT.
Prefetch Enable. When this bit is set, data may be fetched while the BLT is still pending.
Host Source.
0: Data fetched from memory.
1: Data written through host source writes.
Reserved.
Stride. Increment between lines of bitmap in bytes.
Graphics Processor Register Definitions
AMD Geode™ LX Processors Data Book