Texas Instruments 990 - Flowchart for Memory Write Operation

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~ 945424-9701
WQ=t
MOO ,0-7 ,Q
WRQ=t
CUWRQ= 1
WQ=O
MID,0-7 ,Q
MXL=O
(8)136291
LATCH WRITE
DATA STROBE
NO
LATCH READ DATA
NO
SYNCHRONIZE WRITE
DATA STROBE
NO
SET CURSOR WRITE
RESET WRITE DATA STROBE
GATE WRITE DATA TO
MEMORY/CRU INPUT REGISTER
GATE CURSOR ADDRESS
TO MEMORY
MIDRC
NWRHI OR
NWRLO
NMEMQ=O
BEL=1
NWRHI OR
NWRLO
NO
CLOCK WRITE DATA
NO
SELECT WRITE
STROBE
NO
ENABLE BLANK VIDEO
NO
TERMINATE WRITE
STROBE
Figure 1-41. Flowchart for Memory Write Operation
1-69
CUWRQ=O
BLANKQ=t
BLQ=1
NO
RESET
CURSOR
WRITE
NO
LATCH
BEL
NO
BLANK
VIDEO
Digital Systems Division