VT1621M VIA, VT1621M Datasheet - Page 11

• Manufacturer Part Number: VT1621M
• Description: TV Encoder
• Manufacturer: VIA

R
Register Overview
The following tables summarize the configuration and I/O
registers that apply to the VT1621 and VT1621M TV
Encoder. These tables also document the power-on default
value (“Default”) and access type (“Acc”) for each register.
Access type definitions used are RW (Read/Write), RO
(Read/Only), “—” for reserved / used (essentially the same as
RO), and RWC (or just WC) (Read / Write 1’s to Clear
individual bits). Registers indicated as RW may have some
read/only bits that always read back a fixed value (usually 0 if
unused); registers designated as RWC or WC may have some
read-only or read write bits (see individual register
descriptions for details).
Detailed register descriptions are provided in the following
section of this document. All offset and default values are
shown in hexadecimal unless otherwise indicated.
Revision 1.0 June 17, 2002
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- 6-
Offset TV Encoder Registers
53-FF - reserved -
25-49 - reserved -
0A
0B
0C
0D
1A
1B
1C
1D
4A
4B
4C
4D
00
01
02
03
04
05
06
07
08
09
0E
0F
10
11
12
13
14
15
16
17
18
19
1E
1F
20
21
22
23
24
4E
4F
50
51
52
Input Frame Format
Input Sync Format
Scaling / Chroma Filter
Luma Filter
Output Mode
Control 1
Control 2
Start Active Video
Start Horizontal Position
Start Vertical Position
Cr Amplitude Factor
Black Level
Luma Amplitude Factor
Cb Amplitude Factor
Special Effect 0
Special Effect 1
PLL P2 Value
PLL D Value
PLL N Value
PLL Overflow
Sub-carrier Value 0
Sub-carrier Value 1
Sub-carrier Value 2
Sub-carrier Value 3
Version ID
Overflow
Test 0
Test 1
Test 2
TV Sync Step
TV Burst Envelope Step
TV Sub-carrier Phase Adjustment
TV Blank Level
TV Signal Overflow
Input Aperture Threshold
Input Aperture Delta
Aperture Upper Threshold
Aperture Lower Threshold
Aperture Mode and Delta
Coring Function
Y Delay Control
UV Delay Control
Burst Maximum Amplitude
Power Management
Status
- reserved -
Table 3. Register Summary
VT1621 / VT1621M TV Encoder
Register Descriptions
Default Acc
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
05
21
04
00
00
00
00
00
02
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RO
RO
–
–
–