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A-8
Technical Specifications
Dove
Rev. C
A5 size appa.mif
10/28/98 Pass 0
L
Proof Sign-off:
Nishi _______
<leadername> _______
<editorname> _______
nACK/PtrClk/PeriphClk
Busy/PtrBusy/PeriphClk
All modes: DATA 8 is the MSB, DATA 1 is the LSB.
Compatibility mode: Acknowledgment low pulse in order to
indicate that data was transferred from
the host.
Negotiation phase: Low signal indicates IEEE 1284 is
supported; set to high afterwards to
indicate that theXflag and “data
available” flag are valid.
transfer phase: Reverse data In nibble mode, a low signal
indicates that the nibble data is valid.
Reverse idle phase: When switched from low to high,
generates an interrupt that notifies the
host that there is data available.
ECP mode: Used to transfer data from the printer to
the host with handshaking via HostAck
(nAutoFd).
Compatibility mode: High signal indicates that the printer is
not ready to receive data.
Negotiation phase: Reflects the BUSY status of the forward
channel.
Reverse data transfer phase: In nibble mode, this signal serves as
nibble data bit 3 and then 7.
Reverse idle phase: Reflects the BUSY status of the forward
channel.
ECP mode: Used for forward direction flow control.
In reverse direction, this signal is used as
a ninth data bit that indicates whether the
data signals indicate a command or data.