VT1621M VIA, VT1621M Datasheet - Page 10

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

Pin Descriptions
Revision 1.0 June 17, 2002
Signal Name
VCC33
GND
VCC25
GND
VCCPLL
GNDPLL
VCCDAC
GNDDAC
Signal Name
PD[11-0]
HSYNC
VSYNC
XCLK
PCLK
DS_BCO
Y
C
CVBS
CSYNC
SBD
SBC
TESTMODE
CONF_XLT
RESET#
XI
XO
RSET
Technologies, Inc.
We Connect
We Connect
We Connect
We Connect
38, 30, 12
11, 10, 9,
7, 6, 4, 3,
8, 18, 28
2, 1, 44,
43, 42
13, 36
23, 19
Pin #
Pin #
5, 16,
40
41
39
37
35
22
21
20
17
26
27
14
15
29
32
33
24
31
34
25
Type
Type
IO
IO
IO
IO
IO
IO
IO
O
O
O
P
P
P
P
P
P
P
P
I
I
I
I
I
I
I
I
Description
Input for pixel data. These inputs can accept 8 or 12 bit multiplexed RGB or YCbCr
format. Output for testing only.
When Rx1[2]=0, this pin can accept a horizontal sync input. When Rx1[2]=1, the device
will output a horizontal sync pulse through this pin.
When Rx1[3]=0, this pin can accept a vertical sync input. When Rx1[3]=1, the device
will output a vertical sync pulse through this pin.
Reference clock for PDs. It can operate on 1X, 2X or 3X pixel clock.
Pixel clock output. This pin can provide and operate on 1X, 2X or 3X pixel clock to
VGA. Input for testing only.
Input for display enable. The rising edge of this signal identifies the first active pixel of
data for each active line. Output for providing a 14.31818 MHz clock to other devices.
Luminance output for general TV system.
Chrominance output for general TV system.
Composite video output for general TV system.
Composite sync. Input for testing only.
Serial bus data pin.
Serial bus clock pin.
Test mode enable. Pull down for regular operation.
Selects internal or external oscillator. When pulled low, a crystal must be attached to
pins 32 and 33. If pulled high, a stable 14.31818MHz external clock source must be
supplied to pin 32, XI.
When this pin is low, the device is held in the power-on reset condition.
A 14.31818 MHz crystal is attached between XI and XO. An oscillator can also be
connected to this pin.
A 14.31818 MHz crystal is attached between XI and XO. If an external oscillator is
attached with XI, this pin should be connected to ground.
An external resistor, typically 4.87k , attached between this pin and ground sets the FS
(full scale) range of the DACs.
Description
I/O Power. 3.3V
I/O Ground
Digital Power. 2.5V
Digital Ground
PLL Power. 2.5V
PLL Ground
DAC Power. 2.5V
DAC Ground
Table 2. Pin Descriptions
Power and Ground
SIGNALS
-5-
VT1621 / VT1621M TV Encoder
Pinouts