
Interface
Parallel, TTP 7020
100
P1003636-001 TTP 7020™/TTP 7030™ Technical Manual 02/11/2009
Parallel, TTP 7020
The TTP 7020 parallel port is bi-directional and support Compatibility and
Reverse-Nibble modes.
Note • If you intend to use any other mode than Compatibility Mode, we recommend you to
get the documents for the IEEE-1284 standards, and study them thoroughly.
Table 5 • Signal Names for the Parallel Port. Signal Names Starting with "N" are
Active Low Signals
Pin Host
IEEE1284-A
(D-Sub)
Direction
Pin Printer
IEEE1248-C
Compatible
Signal Names
Nibble and Byte
Mode Signal Names
1
Ö
15 nStrobe HostClk
2-9
Ö
6-13 Data Data
10
Õ
3 nAck PtrClk
11
Õ
1 Busy PtrBusy
12
Õ
5 PError AckDataReq
13
Õ
2 Select Xflag
14
Ö
17 nAutoFd HostBusy
15
Õ
4 nFault nDataAvail
16
Ö
14 nInit nInit
17
Ö
16 nSelectIn IEEE 1284 Active
18-25
GND
19-35 Ground Ground
+Ö
18 Host Logic High
.Õ
36 Peripheral Logic High
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