Instruction manual

26
PARALLEL DATA SIGNAL
• Parallel input connector port Signal allocation (Signal : Nibble)
Pin No.
1
2 - 9
10
11
12
13
14
16 • 17
18
19 - 30
31
32
15•
33 - 35
36
Return pin No.
19
20 - 27
28
29
16
Signal
HostClk
Unknown
PtrBusy
PtrBusy
AckDataReq
Xflag
HostBusy
GND
High
GND
Init
DataAvail
NC
1284 Active
From/To
PC/VCP
PC/VCP
PC/VCP
PC/VCP
PC/VCP
PC/VCP
PC/VCP
PC/VCP
PC/VCP
PC/VCP
PC/VCP
Function
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 100µs minimum.
Data1(LSB), Data5
Unused
Becomes “High” when VCP requests each mode of IEEE1284.