AMD Geode LX 800@0.9W - Manual (Page 440)

440 AMD Geode™ LX Processors Data Book
Video Processor Register Descriptions 33234H
6.8.3.26 Alpha Window 1 Control (A1T)
A1C Bit Descriptions
Bit Name Description
63:25 RSVD (RO) Reserved (Read Only). Reads back as 0.
24 ALPHA1_
COLOR_REG_
EN Alpha Window 1 Color Register Enable. Enable bit for the color key matching in alpha
window 1.
0: Disable. If this bit is disabled, the alpha window is enabled, and VG_CK = 0 (VP Mem-
ory Offset 008h[20]); then where there is a color key match within the alpha window,
video is displayed.
If this bit is disabled, the alpha window is enabled, and VG_CK = 1 (VP Memory Offset
008h[20]); then where there is a chroma-key match within the alpha window, graphics
are displayed. See Figure 6-31 on page 438.
1: Enable. If this bit is enabled and the alpha window is enabled, then where there is a
color key match within the alpha window; the color value in ALPHA1_COLOR_REG
(bits [23:0]) is displayed.
23:0 ALPHA1_
COLOR_REG Alpha Window 1 Color Register. Specifies the color to be displayed inside the alpha
window when there is a color key match in the alpha window.
This color is only displayed if the alpha window is enabled and
ALPHA1_COLOR_REG_EN (bit 24) is enabled.
VP Memory Offset 0D8h
Type
R/W
Reset Value 00000000_00000000h
A1T 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
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
PP
A1_EN
LO
AD_ALPHA
A
L
P
H
A1_WIN_EN
ALPHA1_INC ALPHA1_MUL