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Technical Specifications
A-11
Dove
Rev. C
A5 size appa.mif
10/28/98 Pass 0
R
Proof Sign-off:
Nishi _______
<leadername> _______
<editorname> _______
nInit/nReverseRequest
nFault/DataAvail/nPeriphRequest
Compatibility mode: When a low signal is detected, the printer
is deemed to be BUSY until the low signal
is released.
Negotiation phase: Always high.
Reverse data transfer phase: Always high.
ECP mode: Low when switching to reverse direction.
The peripheral device has permission to
drive the data signal only when this
signal is low and 1284active is high.
Compatibility mode: Low signal indicates that an error
occurred.
Negotiation phase: This signal is set high in order to
authorize 1284 compatibility. In nibble
mode, after the host sets HostBusy
(nAutoFd) high, this signal is set low in
order to indicate that the transmission
data is ready.
Reverse data transfer phase: This signal is set low in order to indicate
to a nibble mode host that the
transmission data is ready. Afterwards,
this signal serves as nibble data bit 0 and
then 4.
Reverse final phase: Indicates whether or not the data is valid.
ECP mode: This signal is set low to request
communications with the host. Valid in
both forward and reverse direction.