ch7009b Chrontel, ch7009b Datasheet - Page 6

• Manufacturer Part Number: ch7009b
• Description: Ch7009 Dvi / Tv Output Device
• Manufacturer: Chrontel

CHRONTEL
4. M
The CH7009 is capable of being operated as a single DVI output, or as a VGA to TV encoder. The two modes of
operation cannot be used simultaneously. Descriptions of each of the operating modes, with a block diagram of the data
flow within the device is shown below.
4.1 DVI Output
In DVI Output mode, multiplexed input data, sync and clock signals are input to the CH7009 from the graphics
controller’s digital output port. Data will be 2X multiplexed, and the clock inputs can be 1X or 2X times the pixel rate.
Some examples of modes supported are shown in the table below, and a block diagram of the CH7009 is shown on the
following page. For the table below, clock frequencies for given modes were taken from
TIMING SPECIFICATIONS
device is not dependent upon this set of timing specifications. Any value of pixels/line, lines/frame and clock rate are
acceptable, as long as the pixel rate remains below 165MHz. 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. Although the block
diagram does not show this path as being active, the data input can be selected to be output by the DACs as a VGA type
output. For correct DVI operation, the input data format must be selected to be one of the RGB input formats.
6
ODES OF
1
2
Table 2. DVI Output
1280x1024
1600x1200
1920x1080
These DVD compatible modes are input in a non-interlaced RGB data format.
Resolution
30Hz in progressive scan modes, 60Hz in interlaced modes.
1024x768
1280x720
1280x768
1366x768
720x480
720x576
O
Graphics
720x400
640x400
640x480
800x600
PERATION
if they were detailed there, not
1
2
Aspect Ratio
Active
16:9
15:9
16:9
16:9
4:3
8:5
4:3
4:3
4:3
4:3
4:3
4:3
4:3
Pixel Aspect
1.35:1.00
15:12
Ratio
1:1
1:1
9:8
1:1
1:1
1:1
1:1
1:1
1:1
1:1
1:1
VESA TIMING DEFINITION FOR FLAT PANEL MONITORS.
Refresh Rate
59.94
<30
(Hz)
<85
<85
<85
<85
<85
<60
<60
<85
<60
<60
50
2
Frequency
XCLK
(MHz)
<35.5
<31.5
<158
<165
<140
<36
<57
<95
<67
<75
<80
27
27
201-0000-035 Rev 3.31, 11/4/2004
Frequency
(Mbits)
<1580
<1650
<1400
VESA DISPLAY MONITOR
<355
<315
<360
<570
<950
<670
<750
<800
DVI
270
270
CH7009B
The