Hughes JVC 220, Service Manual

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Chapter 2---System Description
The RGB_VIC I/O
This section provides a description of the inputs to and outputs
from the RGB_VIC. The I/O descriptions are arranged by the
source/destination of the signal. The format used is such that the
assembly communicated with is used as the primary heading of
each group of signals. Those signals are further subdivided into
inputs and outputs. Input refers to an Input to the RGB_VIC,
output refers to an output from the RGB_VIC.
Table 2-3. Standard RGB VIC I/O signals
PROJECTOR INPUTS
INPUTS DESCRIPTION
RED
GREEN
BLUE Video input signals. about 0.7 to 1 VPP
HORIZ. Horizontal or composite sync signal
VERTICAL Vertical sync signal
VIDEO PROCESSOR BOARD
OUTPUTS DESCRIPTION
/SEL_VIC Select line for VIC. A low indicates the RGB_VIC is selected.
RED_VIC
GRN_VIC
BLU_VIC Video signals. about 0.7 to 1 VPP
H_VIC Horizontal or composite sync signals
V_VIC Vertical sync signals
SYSTEM CONTROLLER BOARD
INPUTS DESCRIPTION
IIC_CLK IIC clock line. Unidirectional clock line for control of synchronous
data transfer over the IIC bus interface.
IIC_DATA IIC data line. Bidirectional serial line for synchronous data transfer
between system control board and the RGB_VIC.
OUTPUTS DESCRIPTION
/IIC_INT IIC interrupt line. RGB_VIC does not initiate an interrupt.
LOW VOLTAGE POWER SUPPLY
INPUTS DESCRIPTION
+5.1 V +5.1 V supply for use by RGB_VIC.
Model 220 Service Manual 2-15