Texas Instruments 990 - Model 911 VDT Dot Counter Outputs

~
945424-9701
CLK
DOT RO
-11
n
n
DOTR1
n
n
n
DOTR2
n
n
n
OOTR3
n n
n
DOTR4
n
n
n
DOTR5
n n
n
DOTR6
n
n
n_
(A)136300
Figure 1-51. Model 911 VDT Dot Counter Outputs
Sync Generator. Outputs from the control ROMs (see tables 1-10 through 1-12) control the
flip-flops that comprise the sync generator to produce the following sync timing control signals.
•
HSQ - Horizontal Sync
•
HSBQ - Horizontal Blanking
•
VSQ, NVSQ - Vertical Sync
•
VSBQ - Vertical Blanking
•
CSQ - Composite Sync
•
NBQ - Composite Blanking
Figure 1-54 illustrates the timing relationships for the sync generator. ·
Composite Blanking {NBQ) indicates that either HSBQ or VSBQ is high (logic 1 ), and blanks
output video.
1-85
Digital Systems Division