– 72 –
APPENDIX
Appendix D: Parallel interface

The two-way parallel interface is compatible with the IEEE1284 compatibility

mode, nibble mode and byte mode. Refer to the separate programmer’s manual

for details.

D-1. Table of Connection Signals for Each Mode

Pin No. Direction Compatibility Mode Nibble Mode Byte Mode
Signal Name Signal Name Sginal Name
1 In nStrobe HostClk HostClk
2 In/Out Data0 Data0 Data0
3 In/Out Data1 Data1 Data1
4 In/Out Data2 Data2 Data2
5 In/Out Data3 Data3 Data3
6 In/Out Data4 Data4 Data4
7 In/Out Data5 Data5 Data5
8 In/Out Data6 Data6 Data6
9 In/Out Data7 Data7 Data7
10 Out nAck PtrClk PtrClk
11 Out Busy PtrBusy/Data3,7 PtrBusy
12 Out PError AckDataReq/Data2,6 AckDataReq
13 Out Select Xflag/Data1,5 Xflag
14 In Not used HostBusy HostBusy
15 N/C — —
16 Single GND Single GND Single GND
17 Flame GND Flame GND Flame GND
18 OUT Logic High (+5V) Logic High (+5V) Logic High (+5V)
19 ~ 30
Twisted pair return GND Twisted pair return GND Twisted pair return GND
31 In nInit nInit nInit
32 Out nFault nDataAvail/Data0,4 nDataAvail
33 External GND — —
34 Out Compulsion Status — —
35 N/C — —
36 In nSelectIn 1284Active 1284Active