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5–10 Interfaces
Table 5–4. 1284 Signals
Type
of Mode
Pin
Source of Data
Compatible Nibble Byte
1 Host nStrobe HostClk Host/Clk
2 Host/Printer
Data 1 (LSB)
3 Host/Printer
Data 2
4 Host/Printer
Data 3
5 Host/Printer
Data 4
6 Host/Printer
Data 5
7 Host/Printer
Data 6
8 Host/Printer
Data 7
9 Host/Printer
Data 8 (MSB)
10 Printer nAck PtrClk PtrClk
11 Printer Busy PtrBusy PtrBusy
12 Printer PError AckDataReq AckDataReq
13 Printer Select Xflag Xflag
14 Host nAutoFd Host Busy HostAck
15
Not Defined
16
Logic Gnd
17 Chassis Gnd
18 Printer
Peripheral Logic High
19
Signal Ground (nStrobe)
20
Signal Ground (Data 1)
21
Signal Ground (Data 2)
22
Signal Ground (Data 3)
23
Signal Ground (Data 4)
24
Signal Ground (Data 5)
25
Signal Ground (Data 6)
26
Signal Ground (Data 7)
27
Signal Ground (Data 8)
28
Signal Ground (PError
, Select, nAck)
29
Signal Ground (Busy
, nFault)