Texas Instruments 990 - Flowchart for Memory Read Operation

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(B) 136292
RQ=1
RDQ=t
NMENQ .. O
BE~1
LATCH READ
REQUEST
NO
SYNCHRONIZE
READ REQUEST
NO
SET CURSOR READ
RESET READ REQUEST
GATE CURSOR ADDRESS
TO MEMORY
ENABLE BLANK VIDEO
NO
0
~CLOCK REAO DATA
I I
i
NO
CURDQ=O
RESET CURSOR READ
NO
BLANKQ=1
LATCH BEL
NO
BLQ=t
BLANK VIDEO
Figure 1-42. Flowchart for Memory Read Operation
1-iO
Digital Systems Division