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PARALLEL DATA SIGNAL
•
Parallel input connector port
Pin No.
Return pin No.
1
19
2 - 9
20 - 27
10
28
11
29
12
13
14
16 • 17
18
19 - 30
31
16
32
15•
33 - 35
36
26
Signal allocation (Signal : Nibble)
Signal
From/To
HostClk
PC/VCP
Unknown
PC/VCP
PtrBusy
PC/VCP
PtrBusy
PC/VCP
PC/VCP
AckDataReq
PC/VCP
Xflag
HostBusy
PC/VCP
GND
PC/VCP
High
GND
Init
PC/VCP
PC/VCP
DataAvail
NC
1284 Active
PC/VCP
High
Unknown
Sends data in "Low" when HostBusy is "Low". After HostBusy
turns "High", this signal becomes "High".
Data4, Data8 (MSB)
Data3, Data7
Data2, Data6
High : VCP is on BUSY status.
Low : VCP can send data.
Earth
PeripheralLogicHigh
Earth
Clears sending data to this unit. (Low) Incoming pulse width
should be 100 s minimum.
Data1(LSB), Data5
Unused
Becomes "High" when VCP requests each mode of IEEE1284.
Function
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