VIDC20 Data Sheet
Description
VSS Analog	I 38	P	Supplygroundforanalog videosystem.
VSS_Sound	26-P	'Supply gcoundforanalogsoundsystem.
VSYNC	28 OS16 Vertical Synchronisation. Dependant on the state of bits 19 and 18 in the extern,[ register, either vertical or a composite (XNOR) sync maybe output on this pin, in either polarity. The width of the VSYNC pulse may be defined in units of a raster.
WS/LnA
2	O58	Word Select / Left NOT Right. Again, this pin has two functians depending on whether the sound mode is either analog or digital. hi digital mode, this signal denotes whether the output serial data is for the left hand stereo channel (w,--O) or the right hand channel. In analog mode this signal gives the same stereo direction information, but the polarity is reversed.
Table 1: signal Description
2.1 Key to Signal Types
I	Input (TTL threshold)	IP	Input ("ITL threshold) with pull up resistor
IA	Input Analog	04	Output (4niA Drive)
OS	Output (8mA Drive)	016	Output (16sA Drive)
058	Output (SmA slew-limited drive)	OS36	Output (16av1 slew-limited drive)
OA	Output Analog	P	Power supply