SCD1284 INTEL [Intel Corporation], SCD1284 Datasheet - Page 53

• Manufacturer Part Number: SCD1284
• Description: IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
• Manufacturer: INTEL [Intel Corporation]

Datasheet
Figure 8. FIFO Timer Processing
DETECTS NEW CHARACTER
PUT CHARACTER IN FIFO
BACKGROUND SCANNING
RESUME BACKGROUND
SCANNING LOOP
RELOAD TIMER
ARRIVED
IEEE 1284-Compatible Parallel Interface Controller — CD1284
N
BACKGROUND PROCESSING
POST RECEIVE EXCEPTION
RESUME BACKGROUND
CLEAR NONEWDATA
SERVICE REQUEST
SCANNING LOOP
INTERNAL FLAG
INTERNAL FLAG
NO NEW DATA
FROM OTHER
NO NEW DATA
FIFO EMPTY
TIMER = 0
ENABLED
TIMEOUT
ARMED
Y
Y
Y
Y
?
?
?
?
N
N
N
POST RECEIVE ‘GOOD DATA’
SERVICE REQUEST
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