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Part 2: Product Specifications
ECP Mode
Host Clk [Input]
This signal handshakes with the PeriphAck (BUSY) signal when data is transferred
from the host computer to the printer. When this signal goes HIGH to LOW, it
means that the data is output on the data buses (Data 1 to Data 8). The signal
goes LOW to HIGH in response to the leading edge of the PeriphAck (BUSY) signal.
Reverse data transmission phase:
This signal remains HIGH.
Data 1 to Data 8 [Input/Output]
This signal is used as an input signal when data is transferred from the host
computer to the printer.
Reverse data transmission phase:
This signal is used as an output signal and the printer outputs data to the host
computer using these data buses.
Periph Clk [Output]
This signal remains HIGH when data is transferred from the host computer to the
printer.
Reverse data transmission phase:
This signal goes HIGH to LOW to indicate that data is output to the host computer.
The signal goes LOW to HIGH in response to the leading edge of HIGH pulse of the
HostAck (AUTO FEED XT) signal of the host computer.
Periph Ack [Output]
This signal goes HIGH to LOW when the printer is ready to receive data from the
host computer while transferring the data from the host computer to the printer. It
goes LOW to HIGH when the printer receives data from the host computer.
Reverse data transmission phase:
Indicates whether the data sent from the printer to the data bus is a command or
data. (LOW: Command, HIGH: Data)
Ack Reverse [Output]
This signal remains HIGH when data is transferred from the host computer to the
printer.
Reverse data transmission phase:
This signal remains LOW.
The Reverse Req (INIT) signal is a switching request from the host computer which
goes HIGH to LOW to request a switch from the forward data transmission phase to
the reverse data transmission phase. In response to the falling edge of the Reverse
Req signal, Ack Reverse signal goes HIGH to LOW to indicate that the switching
request has been accepted.
When the switching from the reverse data transmission phase to the forward data
transmission phase takes place, Ack Reverse signal goes LOW to HIGH to indicate
that the switching request has been accepted, in response to the leading edge of the
Reverse Req (INIT) signal which is a switching request from the host computer.
X flag [Output]
This signal remains HIGH in the ECP mode.
Host Ack [Input]
This signal goes from LOW to HIGH when data is transferred from the host
computer to the printer.
Reverse data transmission phase:
This signal handshakes with the Periph Clk (ACKNLG) signal. When the host
computer is ready to receive data from the printer, this signal goes HIGH to LOW.
After the data is received, the signal goes LOW to HIGH.
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BJC-5000
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