28 alpha window 2 y position (a2y), 29 alpha window 2 color (ac2), Alpha window 2 y position (a2y) – AMD Geode LX [email protected] User Manual
Page 442: Alpha window 2 color (ac2)
442
AMD Geode™ LX Processors Data Book
Video Processor Register Descriptions
33234H
6.8.3.28 Alpha Window 2 Y Position (A2Y)
6.8.3.29 Alpha Window 2 Color (AC2)
VP Memory Offset 0E8h
Type
R/W
Reset Value
00000000_00000000h
A2Y 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
ALPHA2_Y_END
RSVD
ALPHA2_Y_START
A2Y Bit Descriptions
Bit
Name
Description
63:27
RSVD (RO)
Reserved (Read Only). Reads back as 0.
26:16
ALPHA2_Y_
END
Alpha Window 2 Y End. Indicates the vertical end position of alpha window 2. This
value is calculated according to the following formula:
Value = desired screen position + (V_TOTAL – V_SYNC_END) + 2. (Note 1)
15:11
RSVD (RO)
Reserved (Read Only). Reads back as 0.
10:0
ALPHA2_Y_
START
Alpha Window 2 Y Start. Indicates the vertical start position of alpha window 2. This
value is calculated according to the following formula:
Value = desired screen position + (V_TOTAL – V_SYNC_END) + 1. (Note 1)
Note 1. V_TOTAL and V_SYNC_END are values programmed in the Display Controller module registers.
The value of (V_TOTAL – V_SYNC_END) is sometimes referred to as “vertical back porch.”
VP Memory Offset 0F0h
Type
R/W
Reset Value
00000000_00000000h
A2C 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
ALPHA2_COLOR_REG_EN
ALPHA2_COLOR_REG