Parallel Interface Control - OKIDATA MICROLINE 320 Service Manual

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.
MPU
Data
1 to 8
STROBE
BUSY
ACK
RXD
A/D bus
RXD
P16
500ns max.
2~8µs
2 – 8
LSI
Receive Data
NBSY
ACK
NSTB
NRXD
CN1
BUSY
ACK-N
STB-N