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A-8
Technical Specifications
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.