CD1283 datasheet(28/94 Pages) INTEL

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CD1283 — IEEE 1284-Compatible Parallel Interface

Datasheet

• 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

FAILED NEG.

(INVALID EXTCODE)

[COMPATIBILITY MODE]

NSR=0x41

TERMINATION

[COMPATIBILITY MODE]

NSR=0x82

NEG-OK

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}

NEG-OK

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}

IDReq

PCISR[1]

NegCh

PCISR[5]

IDReq

PCIER[1]

NegCh

PCIER[5]

FAILED NEG

MODE NOT ENABLED

[COMPATIBILITY

MODE]

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)

HOST TIMEOUT

HOST HAS NOT RESPONDED FOR

OVER 1 SEC.)

[COMPATIBILITY MODE]

NSR=0x22

INVALID

HOST HAS VIOLATED HANDSHAKING

SEQUENCE

[COMPATIBILITY MODE]

NSR=0x16 (EPP)

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)

NOTE: An immediate termination from the host gener-

ates this interrupt

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.

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

(

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