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.

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.

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.

A-8Technical Specifications