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4.
STB
This is a terminal used during parallel data reception and to input the data set signals from the host.
For the LSI to output signal level of this terminal it must be in the on-line status and the RDY signal must be in
the "LOW" level. If the STB terminal is in "LOW" level, the LSI will consider that the data is sent from the host
via the DB0-DB7 and start reading the data after the RDY terminal is switched to the "HIGH" level.
When the LSI completes the data read-in it will output an ACK pulse.
There is a need to keep the STB terminal in the "LOW" level until the startup of the ACK signal at the host is
verified.
5.
ACK
This is the data read-in signal used during parallel data reception.
During parallel data reception this terminal is in the on-line status and after outputting the RDY signal it will
verify that the STB terminal is in the "LOW" level.
Then it will output a "LOW" pulse of about 2 s as a read-in timing signal to input the data in the terminal.
Therefore, there is a need for the data to be stable between, before and after these pulses.
6.
Parallel interface timing chart
*1
VDD
*2 100 ms (Min.)
RESET
SLIN
RDY
DS0~DDS7
STB
*5
ACK
RF
*1 It is necessary to secure an oscillation frequency stabilization time.
*2 Time required for the LSI to make the SLIN pin sensible after resetting the system.
*3 Since the DTR signal may rise regardless of the STB signal due to printer control, it is necessary to output
the STB signal within 200 s after checking the DTR signal.
*3
1us (Min.)
2.0us
90us (Min.)
1us (Min.)
50us (Min.)
30ms (Min.)
15
CBM-909PC Series User'sManual
IN
*4
IN
50us (Max.)
OUT
IN
IN
OUT
IN
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