AMD Geode LX 600@0.7W Data Book page 442

33234H
6.8.3.28 Alpha Window 2 Y Position (A2Y)
VP Memory Offset 0E8h
Type R/W
Reset Value 00000000_00000000h
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
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
RSVD
Bit Name
63:27 RSVD (RO)
26:16 ALPHA2_Y_
END
15:11 RSVD (RO)
10:0 ALPHA2_Y_
START
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."
6.8.3.29 Alpha Window 2 Color (AC2)
VP Memory Offset 0F0h
Type R/W
Reset Value 00000000_00000000h
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
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
RSVD
442
A2Y Register Map
RSVD
ALPHA2_Y_END
A2Y Bit Descriptions
Description
Reserved (Read Only). Reads back as 0.
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)
Reserved (Read Only). Reads back as 0.
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)
A2C Register Map
RSVD
Video Processor Register Descriptions
9 8
RSVD
9 8
ALPHA2_COLOR_REG
AMD Geode™ LX Processors Data Book
7 6 5 4 3 2 1
ALPHA2_Y_START
7 6 5 4 3 2 1
0
0