Download User Manual SP232 Serial Extended Function Module (for 1502B/C

Parallel Protocol
A3
address bit
6
/RD
active low read signal
7
/WR
active low write signal
5
/CS
active low chip signal
9
(Above output lines are driven by a 74HC244 at the Option Port)
/IA
acknowledge for /IR signal (below)
11
Input only (generated by Option Port device):
/IR
active low service request line
(/IR line is pulled up by a 10K to +5 volts)
13
Switch Power Supplies:
+16 switched +16 volts supply
ret16 + 16 volt return lines
+5 switched +5 volts supply (100 ma)
ret5 + 5 volt return line
Tektronix Proprietary DO NOT USE
23 & 25
19 & 21
17
15
2, 4, 26
The general timing relationships of the control signals is diagrammed
with reference to the 5 MHz instrument clock below (although the
clock is not ported).
6–4
clock
/cs
/rd
/wr
___-----___-----___----___-----___---- (__---)
--------_____________------------------ is 200 ns
--------_____________------------------------------______------------------------
address
write data
read data
######============############
######============############
############======############
SP232 User Manual