CD1283 Datasheet, PDF (28/94 Pages) Intel Corporation – IEEE 1284-Compatible Parallel Interface

CD1283 — IEEE 1284-Compatible Parallel Interface
• IDReq for slave ID requests from the remote master.
• nINIT for initialization pulses from the master (Compatibility mode only)
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.
Figure 5. Interrupt Generation Logic
KEY: [ ] = Current mode
{ } = Interface extensibility request value (see IEEE1284 Std for more details)
(register name[x]) : x = bit #, that is PCIER[1] = PCIER, bit 1
IDReq
PCIER[1]
FAILED NEG.
(INVALID EXTCODE)
[COMPATIBILITY MODE]
NSR=0x41
TERMINATION
[COMPATIBILITY MODE] NEG-OK
NEG-OK
NSR=0x82
NSR=0x86[EPP MODE] {40}
NSR=0x88[RN MODE] {00}
NSR=0x8A[RB MODE] {01}
NSR=0x8C[ECP w/o RLE]{10}
NSR=0x8E[ECP w/ RLE] {30}
NSR=0x89[RN ID REQUEST]
{04}
NSR=0x8B[RB ID REQUEST]
{05}
NSR=0x8D[ECP w/o RLE ID REQUEST]{14}
NSR=0x8F[ECP w/ RLE ID REQUEST] {34}
NSR=0x46 (EPP)
NSR=0x48 (RN)
NSR=0x49 (RN-ID)
NSR=0x4A (RB)
NSR=0x4B (RB-ID)
NSR=0x4C (ECP)
NSR=0x4D (ECP-ID)
NSR=0x4E (ECP-RLE)
NSR=0x4F (ECP-RLE-ID)
FAILED NEG
MODE NOT ENABLED
[COMPATIBILITY
MODE]
NSR=0x22
HOST TIMEOUT
HOST HAS NOT RESPONDED FOR
OVER 1 SEC.)
[COMPATIBILITY MODE]
NegCh
NSR=0x16 (EPP)
PCIER[5]
NSR=0x18 (RN)
NSR=0x19 (RN-ID)
NSR=0x1A (RB)
NSR=0x1B (RB-ID)
NSR=0x1C (ECP)
NSR=0x1D (ECP-ID)
NSR=0x1E (ECP-RLE)
NSR=0x1F (ECP-RLE-ID)
INVALID
HOST HAS VIOLATED HANDSHAKING
SEQUENCE
[COMPATIBILITY MODE]
IDReq
PCISR[1]
NegCh
PCISR[5]
NOTE: ID requests fail if either the negotiation type or RID is disabled in
NER. Other negotiations also fail if the negotiation type is disabled.
NOTE: An immediate termination from the host gener-
ates this interrupt
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28
Datasheet