JVC 340 SC, 330, 370 SC service manual Raster Timing Generator, Corrstrt

Chapter 2—Functional Descriptions

		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
	I	INTI
	O	Vertical Flyback Start Delay
	O	Map Start Delay
	O	L Blank
	O	R Blank
	O	U Blank
	O	D 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

2-68 Model 330. 340SC, and 370SC Service Manual