ch7004c Chrontel, ch7004c Datasheet - Page 3

• Manufacturer Part Number: ch7004c
• Description: Digital Pc To Tv Encoder With Macrovisiontm
• Manufacturer: Chrontel

CHRONTEL
3.2 P
201-0000-024 Rev. 2.4, 6/24/2004
Table 1. Pin Descriptions
44Pin
LQFP
15,14,
13,12,
11,10,
9,7,6,
4,3,
2,1,
44,43,42
37
39
41
40
35
32
33
24
22
21
in Description
Type
In
Out
In
In/Out
In/Out
Out
In
In
In
Out
Out
Symbol
D15-D0
P-OUT
XCLK
V
H
BCO
XI
XO/FIN
RSET
Y/R
C/G
s
Description
Digital Pixel Inputs
These pins accept digital pixel data streams with either 8, 12, or 16-bit multiplexed or
16-bit non-multiplexed formats, determined by the input mode setting (see Registers
and Programming section). Inputs D0 - D7 are used when operating in 8-bit
multiplexed mode. Inputs D0 - D11 are used when operating in 12-bit mode. Inputs
D0 - D15 are used when operating in 16-bit mode. The data structure and timing
sequence for each mode is described in the section on Digital Input Port.
Pixel Clock Output
The CH7004, operating in master mode, provides a pixel data clocking signal to the
VGA controller. This pin provides the pixel clock output signal (adjustable as X, 2X or
3X) to the VGA controller (see the section on Digital Video Interface and Registers
and Programming for more details). The capacitive loading on this pin should be kept
to a minimum.
Pixel Clock Input
To operate in a pure master mode, the P-OUT signal should be connected to the
XCLK input pin. To operate in a pseudo-master mode, the P-OUT clock is used as a
reference frequency, and a signal locked to this output (at 1X, 1/2X, or 1/3X the P-
OUT frequency) is input to the XCLK pin. To operate in slave mode, the CH7004
accepts an external pixel clock input at this pin. The capacitive loading on this pin
should be kept to a minimum.
Vertical Sync Input/Output
This pin accepts the vertical sync signal from the VGA controller, or outputs a vertical
sync to the VGA controller. The capacitive loading on this pin should kept to a
minimum.
Horizontal Sync Input/Output
This pin accepts the horizontal sync from the VGA controller, or outputs a horizontal
sync to the VGA controller. The capacitive loading on this pin should be kept to a
minimum.
Buffered Clock Output
This pin provides a buffered output of the 14.31818 MHz crystal input frequency for
other devices and remains active at all times (including power-down). The output can
also be selected to be other frequencies (see Registers and Programming).
Crystal Input
A parallel resonance 14.31818 MHz (± 50 ppm) crystal should be attached between
XI and XO/FIN. However, if an external CMOS clock is attached to XO/FIN, XI
should be connected to ground.
Crystal Output or External Fref
A 14.31818 MHz (± 50 ppm) crystal may be attached between XO/FIN and XI. An
external CMOS compatible clock can be connected to XO/FIN as an alternative.
Reference Resistor
A 360 Ω resistor with short and wide traces should be attached between RSET and
ground. No other connections should be made to this pin.
Luminance Output
A 75 Ω termination resistor with short traces should be attached between Y and
ground for optimum performance. In normal operating modes other than SCART,
this pin outputs the luma video signal. In SCART mode, this pin outputs the red
signal.
Chrominance Output
A 75 Ω termination resistor with short traces should be attached between C and
ground for optimum performance. In normal operating modes other than SCART,
this pin outputs the chroma video signal. In SCART mode, this pin outputs the
green signal.
CH7004C
3