Parallel Interface Control - OKIDATA ML590 Service Manual

Page: 53
Service Guide ML590/ML591
Chapter 2 Principles of Operation

2.1.04 Parallel Interface Control

The parallel data input from the host to the interface LSI is latched to the internal register by the
falling edge of the STROBE-N signal.
The LSI sets the BUSY-N signal to inform the host that the data is being processed. The LSI also
outputs the RXD-N 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 is complete, the BUSY-N signal is disabled and the ACK-N signal is
sent to request the next data. When the buffer is full and reception is not desired, the BUSY signal
is sent to request data transmission be stopped.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)