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Technical Specifications
A-9
R4C3810 Reference Guide
Rev. C
A5 size APTEC.FM
9/30/99 Pass 0
R
Proof Sign-off:
ABE K.Tsuno M.Takata_______
M.Takata _______
ABE J.Holmes _______
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.
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.