ch7008a Chrontel, ch7008a Datasheet - Page 26

• Manufacturer Part Number: ch7008a
• Description: Digital Pc To Tv Encoder
• Manufacturer: Chrontel

CHRONTEL
Register Descriptions (continued)
Input Data Format Register
This register sets the variables required to define the incoming pixel data stream.
Reserved (bit 5): This bit should be set to 0.
DACG (bit 6): This bit controls the gain of the D/A converters. When DACG=0, the nominal DAC current is 71
μ
which provides the correct levels for PAL and NTSC-J.
Clock Mode Register
The setting of the clock mode bits determines the clocking mechanism used in the CH7008. The clock modes are
shown in the table below. PCM controls the frequency of the P-OUT clock, and XCM identifies the frequency of the
XCLK input clock.
26
Table 17. Input Data Format
A, which provides the correct levels for NTSC and PAL-M. When DACG=1, the nominal DAC current is 76
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001-1111
Bit:
Symbol:
Type:
Default:
Bit:
Symbol:
Type:
Default:
IDF[3:0]
7
CFRB
R/W
0
7
Not available
Not available
Not available
Not available
12-bit multiplexed RGB (24-bit color) input (“C” multiplex scheme)
12-bit multiplexed RGB (24-bit color) input (“I” multiplex scheme)
Not available
8-bit multiplexed RGB (16-bit color, 565) input
8-bit multiplexed RGB (15-bit color, 555) input
8-bit multiplexed YCrCb (24-bit color) input (Y, Cr and Cb are multiplexed)
6
M/S*
R/W
0
6
DACG
R/W
0
5
Reserved
5
Reserved
R/W
0
R/W
0
4
MCP
R/W
1
4
Description
3
IDF3
R/W
0
3
XCM1
R/W
0
R/W
2
IDF2
0
2
XCM0
R/W
0
201-0000-027 Rev 2.8, 6/24/2004
Address: 04H
Bits: 6
Address: 06H
Bits: 8
Symbol: IDF
Symbol: CM
1
IDF1
R/W
0
1
PCM1
R/W
0
CH7008A
0
IDF0
R/W
0
0
PCM0
R/W
0
μ
A,