Toshiba TDP-D1 Service Manual page 101

Color Wheel Index - CWINDEX
The DDP1000 electronics uses the CWINDEX to phase and frequency lock the color wheel to a
multiple of the vertical sync (VSYNCZ). The DDP1000 electronics phases the display of the data on
the DMD based on the CWINDEX signal. The CWINDEX indicates the beginning of the red light
on the DMD device. The DDP1000 electronics can be configured over the command interface to
delay the CWINDEX. This is useful for electronic alignment of the color wheel. The delay at a color
wheel rate of 120Hz is specified over the I2C command interface. The DDP1000 electronics scales
the delay based on the ratio of 120Hz divided by the actual wheel rate. The delayed color wheel
index is available on a test point.
Lamp Power Supply Control Signals
The DDP1000 electronics can control DC, Philips UHP and Osram VHP type lamp ballasts.
Other lamp ballasts with compatible interface can be supported. The DDP1000 electronics provides
a lamp enable (LAMPEN) signal for lamp control and a lamp lit (LAMPLITZ) signal for status from
the lamp ballast.
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