Projector Service Manual

Chapter 2—Functional Descriptions
2-68 Model 330. 340SC, and 370SC Service Manual
Raster Timing Generator
I/O Description
IICDATA Data line for transferring the following data (I = input, 0 =
output). The input data are associated with an interrupt pulse.
O Priority Select
I /Sync Select
I Internal Sync
I Horizontal Count
I /Phase Lock
IINTI
O Vertical Flyback Start Delay
O Map Start Delay
OL Blank
OR Blank
OU Blank
OD Blank
O/STBP
O DC Restore Delay
I Phase Count
I Correction Delay
I Pincushion Start Delay
Input Description
/IICINT Interrupt used to tell the SCB that the RTG has data to report.
/FRAMEST Timing pulse Indicating the beginning of a frame. Used in the
SCB for counting vertical frequency. (TP5)
/MAPST Signal used to start the correction and overlay address counters
during each vertical sweep. (TP12)
/Hx112 Clock pulse at 112 times the horizontal frequency. Used for
convergence and Z-axis correction map generation. (TP20)
/Hx224 Square wave signal 224 times the horizontal frequency for
overlay map generation, horizontal map correction start, left
and right blanking, DC restore, and other timing functions.
(TP23)
/FIELD1 TTL level indicating which field of an interlaced frame (Low if
non-interlaced. (TP8)
/CORRSTRT Signal used to start the convergence and overlay address
generators during each horizontal sweep. (TP4)
INTI Indicates when input source signal is interlaced. (TP2)
/VSYNC Regenerated vertical sync signal, pulse-shaped to 3 horizontal
lines in width. (TP21)
Output Description