JVC Model 200 service manual Rtgok, Rtgmodel, Hcount, Vcount, Inputmode, Interlace

			Chapter 2---System Description
I	9	Left blanking	Data for adjustment of left blanking
I	12	Top blanking	Data for adjustment of top blanking
I	12	Bottom blanking	Data for adjustment of bottom blanking
I	8	Horz. phase	Data for adjustment of horizontal phase
I	12	Vert. phase	Data for adjustment of vertical phase
O	3	Frequency bands	The frequency band associated with the current
			signal
O	1	/RTG_OK	A low on this line indicates an operational RTG
			board
O	2	RTG_MODEL	The revision of the RTG board
O	12	H_COUNT	The number of horizontal lines associated with
			the current signal
O	12	V_COUNT	Data for V_COUNT
O	3	INPUT_MODE	Data indicating the selected sync signals
O	1	INTERLACE	High indicates interlace pattern

	Raster Timing Generator Input/Output
	This section describes the inputs to and outputs from the RTG
	board. The I/O descriptions are arranged by the source and
	destination of the signal. The assembly communicated with is
	used as the primary heading of each output. Input refers to an
	input to the RTG, output refers to an output from the RTG.
Table 2-11.Raster Timing Generator I/O signals
	System Controller Board
INPUTS	DESCRIPTION
ISYNC_CLK	5 mHz clock used to generate the internal sync signals
IIC_CLK	IIC clock line. Unidirectional clock line for control of synchronous
	data transfer over the IIC bus interface
IIC_DATA	IIC data line. Bi directional serial line for synchronous data transfer
	between system control board and RTG board
OUTPUTS	DESCRIPTION
/IIC_INT	IIC interrupt line. This is not used by the RTG board.
SOURCE_	This signal indicates a new source (or valid). A high indicates a valid
VALID	stable signal and low indicates change in input signal
ODD_FIELD	Square wave with 50 % duty cycle which is low during the odd field
	of an interlace signal. This signal is high for noninterlaced signals
280_CLK	Square wave signal, 50 % duty cycle, 280 times the frequency of
	horizontal sync. This clock is synchronized to the horizontal sync.

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