CD1865 Datasheet, PDF (34/150 Pages) Intel Corporation – Intelligent Eight-Channel Communications Controller

CD1865 — Intelligent Eight-Channel Communications Controller
Figure 7. Receive Timer Operation
BACKGROUND SCANNING
DETECTS NEW CHARACTER
ARRIVED
...FROM OTHER
BACKGROUND
PROCESSING...
PUT CHARACTER IN FIFO;
RELOAD TIMER
RESUME BACKGROUND
SCANNING LOOP...
TIMER
N
=0
?
Y
IS
FIFO
EMPTY
?
Y
N
POST RECEIVE GOOD
DATA SERVICE REQUEST
NO NEW DATA
TIMEOUT FEATURE
ENABLED
N
?
Y
NNDT
INTERNAL FLAG
’ARMED’
N
?
Y
CLEAR NNDT
INTERNAL FLAG
POST RECEIVE EXCEPTION
SERVICE REQUEST
RESUME BACKGROUND
SCANNING LOOP...
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Datasheet