ch7009a ETC-unknow, ch7009a Datasheet - Page 8

• Manufacturer Part Number: ch7009a
• Description: Chrontel Ch7009 Dvi / Tv Output Device
• Manufacturer: ETC-unknow

TV Output
In TV Output mode, multiplexed input data, sync and clock signals are input to the CH7009 from the graphics
controllers digital output port. A P-OUT clock can be output as a frequency reference to the graphics
controller, which is recommended to ensure accurate frequency generation. Horizontal and vertical sync
signals are normally sent to the CH7009 from the graphics controller, but can be output to the graphics
controller as an option. This method should not be used for pixel frequencies above 50 MHz. Data will be 2X
multiplexed, and the XCLK clock signal can be 1X or 2X times the pixel rate. The input data will be encoded
into the selected video standard, and output from the video DAC’s. The modes supported for TV output are
shown in the table below, and a block diagram of the CH7009 is shown on the following page. In the block
diagram, all blocks are shown. Those blocks which are non-active are shown as shaded. The clock and data
paths which are in use are highlighted.
Table 3: TV Output Modes
1
2
CHRONTEL
Graphics
Resolution
512x384
512x384
720x400
720x400
640x400
640x400
640x480
640x480
720x480
720x480
720x576
720x576
800x600
800x600
1024x768
1024x768
8
These DVD modes operate with interlaced input, scan conversion and flicker filter are bypassed
These DVD modes operate with non-interlaced input, scan conversion is not bypassed
1
2
1
2
Active Aspect
Ratio
4:3
4:3
4:3
4:3
8:5
8:5
4:3
4:3
4:3
4:3
4:3
4:3
4:3
4:3
4:3
4:3
Pixel Aspect
1.35:1.00
1.35:1.00
15:12
15:12
Ratio
1:1
1:1
1:1
1:1
1:1
1:1
9:8
9:8
1:1
1:1
1:1
1:1
TV Output Stan-
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
dard
Scaling Ratios
3/4, 7/10, 5/8
5/4, 1/1, 7/8
5/4, 1/1, 5/6
1/1, 7/8, 5/6
1/1, 7/8, 5/6
1/1, 5/6, 5/7
1/1, 5/6, 5/7
5/7, 5/8, 5/9
5/8, 5/9, 1/2
5/4, 1/1
5/4, 1/1
5/4, 1/1
5/4, 1/1
5/4, 1/1
1/1
1/1
201-0000-035 Rev 1.1, 5/8/2000
CH7009A