SCD1284 INTEL [Intel Corporation], SCD1284 Datasheet - Page 44
SCD1284
Manufacturer Part Number
SCD1284
Description
IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
Manufacturer
INTEL [Intel Corporation]
Datasheet
1.SCD1284.pdf
(176 pages)
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CD1284 — IEEE 1284-Compatible Parallel Interface Controller
44
Any or all of these bits may be set, based on the mode of operation.
The NegCh interrupt is issued whenever the remote master performs a protocol change, such as
moving from Compatibility mode to ECP; the CPU examines the NSR to determine the new state
of the parallel interface. Signal changes can be identified by reading the SSR. In response to the
EPPAW interrupt, the CPU would read the EAR to retrieve the value that was written during the
EPP address write cycle.
•
•
•
•
•
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NegCh for negotiation changes
SigCh for signal changes on the port status inputs (Manual mode only)
EPPAW for EPP protocol address writes
DirCh for direction changes on the parallel channel
IDReq for slave ID requests from the remote master.
nINIT for initialization pulses from the master (Compatibility mode only)
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