
=
- VCLK (input) : (mentioned in section 5.1 "Clock Module and PLL")
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26
Versi on 0. 4, March/2000
B. Display interface :
- CP2/C/Blue (output) :
During composite video mode (NTSC, PAL), this pin is analog "composite video" output.
During S-Video mode, this pin is analog "chrominance" output.
During monitor mode, this analog output supplies current corresponding to the "blue" intensity of the
pixel
being displayed.
(To maintain IBM VGA compatibility, R-G-B outputs are typically terminated to monitor's ground with a
75
omv 2% resistor. This resistor, in parallel with the 75 omv resistor in the monitor, will yield a 37.5 omv
impedance to ground. For a full-scale voltage of 700 mV, full-scale current output will be 18.7mA.)
- CP1/Y/Green (output) :
During composite video mode (NTSC, PAL), this pin is analog "composite video" output.
During S-Video mode, this pin is analog "luminance" output.
During monitor mode, this analog output supplies current corresponding to the "green" intensity of the
pixel
being displayed.
- CP0/Red (output) :
During composite video mode (NTSC, PAL), this pin is analog "composite video" output.
During S-Video mode, this pin left no connection.
During monitor mode, this analog output supplies current corresponding to the "red" intensity of the
pixel
being displayed.
- HSO (output) :
Horizontal Sync of the displayed graphic output. The content of VAconf[] determines the polarity of
this signal.
- VSO (output) :
Vertical Sync of the displayed graphic output. The content of VAconf[] determines the polarity of this
signal.
C. DAC interface :
- VREF (analog Out) : (optional)
Voltage Reference Out; Bypass and decouple the voltage reference with 0.1uF ceramic capacitor to
the TVDD.
The decoupling capacitor shall be as close to the chip as possible. This pin as well as "COMP" are used
to
control the current of internal current sources are exactly equal to "Iref".
- COMP (analog Out) :
Compensation pin. It shall be decoupled with a 0.1uF ceramic capacitor to TVDD. The decoupling
capacitor
shall be as close to the chip as possible.
- RSET (analog Out) :
Current Source Adjusting Resistor. This pin is used to adjust the full scale current of TV's analog
outputs. A
resistor shall be connected between this pin and TVSS. (The DAC's "Iref" of current mirrors are
adjusted by