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Chapter 2---System Description
• LED indication
• IIC serial bus interface
RED
GRN
BLU
HOR
/SELECT
Y/G
Pb/B
Pr/R
IIC_CLK
IIC_DATA
+5.1V_STBY
+5.1V
+15V
-15V
B2
B4
B6
B8
B12
B13
A13
A16
B16
B15
B14
Pin callouts are to P12, P14,
or P18, depending on which
VIC slot is being used.
Figure 2-8. HDTV YPbPr VIC Input/Output Diagram.
This VIC accepts two types of video signals, color components
(YPbPr) and RGB signals. In either case the output of this VIC is
RGB type signals. If the inputs are color components they will be
converted to RGB type signals.
The selection between color component input mode and RGB
input mode is controlled by an input. This input is controlled by the
System Controller Board via the IIC serial bus interface.
LED indication
There are two LEDs on this VIC. The RGB LED glows when the
YPbPr_VIC is selected and is in RGB input mode. The YPbPr LED
glows when the YPbPr_VIC is selected and is in YPbPr input
mode. Both LEDs are off when the YPbPr_VIC is not selected as
the input to projector. Only one LED can be on at one time.
IIC Interface
The YPbPr_VIC is controlled by the serial bus interface. The IIC
bus comes from the System Controller Board through the
Backplane Board. All required adjustments for this board are
provided via the IIC serial bus interface. The information
transferred over the IIC bus is indicated below (I = input to
YPbPr_VIC, and O = output of YPbPr_VIC). The selection of this
VIC is accomplished through the IIC control bus which provides
the /SEL_VIC signal.
2-18 Model 200 Service Manual