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ECP mode
c Data 1 ~ 8 (Printer ← → Host)
z Input/output data signals for the 1st to 8th bits.
z Logic 1 is “High” level.
d HostClk (Printer ← Host)
z This signal is used with the PeriphAck signal for transferring data information or address
information from the host to peripheral equipment when a closed loop and handshake are
executed.
e PeriphAck (Printer → Host)
z Peripheral equipment controls the forward data transfer using this signal. This signal also
provides the 9th data bit which is used for determining whether or not command
information or data information is included in the reverse data signal.
f PeriphClk (Printer → Host)
z This signal is used with the HostAck signal for transferring data information or address
information from peripheral equipment to the host when a closed loop and handshake are
executed.
g nReverseRequest (Printer ← Host)
z The host makes this signal LOW to change channels to the reverse direction.
z In the ECP mode, only when this signal is LOW and the IEEE1284Active is HIGH,
peripheral equipment can activate the bidirectional data signal.
h XFlag (Printer → Host)
z
i nPeriphRequest (Printer → Host)
z In the ECP mode, peripheral equipment can make this signal LOW for requesting
communications with the host. The request is just only a “Hint” for the host. The host
ultimately controls the transfer direction. This signal provides the peer-to-peer
communication mechanism. This signal is usually used for generating an interrupt to the
host. This signal takes effect in both directions forward and reverse.
j nAckReverse (Printer → Host)
z Peripheral equipment makes this signal LOW, and returns an ACK to the
nReverseRequest signal. The host is dependent on the nAckReverse signal to determine
the timing when the host is allowed to activate the data signal.
k +5 V
z This is not a signal but a +5 V power supply voltage.
z
The maximum current of 500 mA can be taken out.
l IEEE1284Active (Printer ← Host)
z
11 HostAck (Printer ← Host)
z The host activates this signal to control the reverse data transfer. This signal is used with
the PeriphClk signal, when an interlocked handshake is performed. This signal also
provides the 9th data bit which is used for determining whether or not command
information or data information is included in the forward data signal.