TSC TTP-245

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