Rice Lake Okidata 320-390-420 Turbo - Service Guide - Manual (Page 18)

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Service Guide ML320/321Turbo
Chapter 2 Operation Description
2.1.4 Parallel Interface Control
The parallel data input from the host to the interfaced LSI is latched to its internal register at the falling
edge of the STROBE-N signal.
At the same time, the LSI sets the BUSY signal to the high level to inform the host that the data is being
processed, and outputs the RXD signal to inform the MPU of data reception. The data is read upon
receiving the RD-N signal from the MPU.
When the data processing ends, the BUSY signal is set to off and the ACK-N signal in sent to request the
next data. When reception is impossible because the buffer is full, the BUSY signal is sent to stop data
transmission.
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