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<strong>TTP</strong>-<strong>245</strong> / <strong>TTP</strong>-<strong>343</strong><br />
The pin assignments for nibble mode parallel interface connector is as following:<br />
Table 3. Pin Assignments For nibble mode Parallel Interface Connector<br />
Pin SPP Mode Nibble Mode In/Out Function<br />
1 Strobe HostClk In<br />
A low on this line indicates that there are valid<br />
data at the host. When this pin is de-asserted, the<br />
+ve clock edge should be used to shift the data<br />
into the device.<br />
2-9 Data 0-7 Data 0-7 In Data Bus. Single-directional.<br />
10 Ack PtrClk Out<br />
11 Busy PtrBusy Out<br />
A low on this line indicates that there are valid<br />
data at the Device. When this pin is de-asserted,<br />
the +ve clock edge should be used to shift the<br />
data into the host.<br />
When in reverse direction, a high indicates data,<br />
while a low indicates a command cycle. In forward<br />
direction, it functions as PtrBusy.<br />
12<br />
Paper Out /<br />
End<br />
AckDataReq Out When low, device acknowledges reverse request.<br />
13 Select X-Flag Out Extensibility flag<br />
14 Auto Linefeed HostBusy In<br />
When in forward direction, a high indicates data,<br />
while a low indicates a command cycle. In reverse<br />
direction, it functions as HostBusy.<br />
15 No Defined NC N/A<br />
16-17 Ground Ground GND Ground<br />
18 Logic High High / Vcc Out<br />
19-30 Ground Ground GND Ground<br />
31 Initialize nInit In A low indicates data in reverse direction<br />
32 Error / Fault nDataAvail Out<br />
A low set by the device indicates that the reverse<br />
data is available<br />
33-35 Ground Ground GND Ground<br />
36 Select Printer 1284 Active In<br />
A high indicates that host is in 1284 transfer<br />
mode. Taken low to terminate.<br />
26