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A-10
Technical Specifications
Dove
Rev. C
A5 size appa.mif
10/28/98 Pass 0
L
Proof Sign-off:
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nAutoFd/HostBusy/HostAck
NC
Not used.
PeripheralLogicHigh
Pull up to + 5 V with 3.9 k
Ω
.
Compatibility mode: Not used.
Negotiation phase: In order to request 1284 mode, this signal
is set low and IEEE 1284active (nSelectIn)
is set high. Afterwards, this signal is set
high whenPtrClk (nAck) is set low.
Reverse data transfer phase: In nibble mode, setting this signal low
indicates to the printer that the host is
ready to receive data. When this signal is
subsequently set high, it indicates that
the host received the data.
Reverse idle phase: This signal is set high in response to a
PtrClk (nAck) low pulse in order to
return to be reverse data phase. If this
signal is set high at the same time that
IEEE 1284active (nSelectIn) is set low, the
IEEE 1284 idle phase is aborted and the
interface returns to compatibility mode.
ECP mode: Used for reverse direction flow control.
Also used for handshaking via PeriphClk
(nAck).