W90221X Winbond Electronics Corp America, W90221X Datasheet - Page 75

• Manufacturer Part Number: W90221X
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

Overlay Control Register (OVLC)
Port address: 0x00000120
Bits 0-27
Bits 28-31
W90221X version 0.6
16
24
0
8
17
25
1
9
Reserved
Reserved
Overlay display select
These four 1-bit registers are selected by color key and window key
as described below:
Each 1-bit register, when selected, is used to control current
overlaying output as described below.
Notes: Background on the screen, controlled by OC0 when all keys
are inactive, should be either graphics stream or VA stream as
specified by VPOSTCR_16. It means that OC0 should be
programmed to either 0 (when VPOSTCR_16 = 1) or 1 (when
VPOSTCR_16 = 0).
10
18
26
Color Key
Color Key
2
0
0
1
1
0
1
Access type: read/write
11
19
27
3
Reserved
Reserved
Reserved
Window Key
OC0
12
20
28
0
1
0
1
4
Graphics stream
Overlay Output
VA stream
OC1
13
21
29
5
Overlay Control
OC0
OC1
OC2
OC3
OC2
14
22
30
6
Default: 0x0
OC3
15
23
31
7
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