PError/AckDataReq/nAckReverse

Compatibility mode: High signal indicates that a feed jam occurred in the paper supply section, or that there is no paper in the paper-tray or cassette.

Negotiation phase: High signal indicates whether or not IEEE 1284 is supported or not. Afterwards, this signal conforms with nDataAvail (nFault).

Reverse data transfer phase: In nibble mode, this signal serves as nibble data bit 2 and then 6.

Reverse idle phase: High until the host requests a data transfer. Afterwards, this signal conforms with nDataAvail (nFault).

ECP mode: Low signal authorizes nReverseRequest. The host looks at this signal in order to determine whether or not it has

permission to drive the data signals.

A

 

Select/Xflag

 

Compatibility mode: Always high

 

Negotiation phase: Xflag indicates the extensibility flag. Used to

 

respond to the extensibility request value sent from the host.

 

Reverse data transfer phase: In nibble mode, this signal serves as

 

nibble data bit 1 and then 5.

 

Reverse idle phase: Same as negotiation phase

 

ECP mode: Same as negotiation phase

 

nAutoFd/HostBusy/HostAck

 

Compatibility mode: Not used

 

Negotiation phase: In order to request 1284 mode, this signal is

 

set low and IEEE 1284active (nSelectln) is set high. Afterwards,

 

this signal is set high when PtrClk (nAck) is set low.

 

Technical Specifications

A-9