Signals
Signals
Table 10 lists each of the signals associated with the corresponding pins on the 1284 interface. Descriptions of the signals follow.
Table 10. 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 Grid |
|
| |
|
|
|
|
| |
17 |
| Chassis Grid |
|
| |
|
|
|
| ||
18 | Printer | Peripheral Logic High |
| ||
|
|
|
|
| |
299
