Parallel Interface Control - Oki MICROLINE 320 Turbo Maintenance 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 request stopping of data transmission.
Data
1 to 8
STROBE
BUSY
ACK
RXD
42089201TH Rev.4
MPU
A/D bus
RXD
P16
500ns max.
2~8 s
LSI
Receive Data
NBSY
ACK
NSTB
NRXD
Oki Data CONFIDENTIAL
CN1
BUSY
ACK-N
STB-N
16 /