JVC 340 SC - Manual (Page 62)

Chapter 2—Functional Descriptions
2-50 Model 330. 340SC, and 370SC Service Manual
RTHRESH Threshold (Z-axis offset) correction information for red. Real
time data at 0V to 1V.
GTHRESH Similar to RTHRESH.
BTHRESH Similar to RTHRESH.
+SERCLK Serial data transfer clock (+). Unidirectional, differential clock
line from SCB to other circuit boards. Used for
synchronous control of serial communication over
SERDATA data lines.
-SERCLK Serial data transfer clock (-).
+SERDATA Serial data transfer. Unidirectional, differential, synchronous
serial data communication line. Used for transferring data
from SCB to other circuit boards. Uses SERCLK and IIC
for control of receiver.
-SERDATA Serial data transfer.
System Controller Board
Outputs Description
/IICINT Interrupt used to tell the SCB that the VPB has data to report.
I/O Description
IICDATA IIC data line. Bi-directional serial line for synchronous data
transfer between SCB and other circuit boards. See
detailed description for list of signals transferred and data
direction.
Raster Timing Generator
Inputs Description
VIDBLANK Along with RONSCRN, GONSCRN, BONSCRN, and
VONSCRN from the SCB, and DCRSTR, determines
whether there is full brightness, black, gray-scale, or
external video presented at a given point on the screen.
DCRSTR Along with RONSCRN, GONSCRN, BONSCRN,
VONSCRN, from the SCB, and VIDBLANK, determines
whether there is full brightness, black, gray-scale, or
external video presented at a given point on the screen.
Outputs Description
SGSYNC Stripped Green Sync. The composite sync signal stripped from
the green channel
(if it exists) (TP13).
HSYNC Horizontal Sync. This can be either just the horizontal sync, in
which case there will be a separate vertical sync, or
HSYNC can be a composite sync. (TP14)
VSYNC Vertical Sync. This cannot be a composite sync signal. (TP15)