Table 5.2 Parallel interface signals (continued)

 

Connector

Return

 

 

 

 

 

Signal

 

 

 

 

 

 

pin

line pin

 

Compati mode

Direction

 

Description

 

number

number

 

 

 

 

 

 

Nibble mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

22

 

 

 

 

 

 

 

 

Output

This signal goes low under the following printer

 

 

Fault

 

 

 

 

 

 

 

 

 

 

 

 

 

conditions:

 

 

 

 

 

 

 

 

 

 

 

 

 

(1)

Offline

 

 

 

 

 

 

 

 

 

 

 

 

 

(2)

Paper out

 

 

 

 

 

 

 

 

 

 

 

 

 

(3) Cover open

 

 

 

 

 

 

 

 

 

 

 

 

 

(4)

Other printer error

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Data Available

 

Reverse data transfer phase:

 

 

 

 

 

 

 

 

 

 

 

 

 

This signal is set low when the printer is ready to

 

 

 

 

 

 

 

 

 

 

 

 

 

send data to the host. During the data transfer, it is

 

 

 

 

 

 

 

 

 

 

 

 

 

used as data bit 0 (LSB), then data bit 4.

 

 

 

 

 

 

 

 

 

 

 

 

 

Reverse idle phase:

 

 

 

 

 

 

 

 

 

 

 

 

 

This signal is used to indicate that data is available.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

23

 

Paper Empty (PE)

Output

This signal goes high if paper runs out.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ack Data Req

 

Reverse data transfer phase:

 

 

 

 

 

 

 

 

 

 

 

 

 

Data bit 2, then data bit 6

 

 

 

 

 

 

 

 

 

 

 

 

 

Reverse idle phase:

 

 

 

 

 

 

 

 

 

 

 

 

 

This signal is set high until the host requests data

 

 

 

 

 

 

 

 

 

 

 

 

 

and, after that, follows the Data Available signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

24

 

Data 1

Input

• Data 1 to Data 8 signals correspond to parallel

 

7

25

 

Data 2

Input

data bits 1 to 8.

 

8

26

 

Data 3

Input

• Data 8 is the most significant bit.

 

9

27

 

Data 4

Input

• All signals must go high at least 0.5 μs before

 

10

28

 

Data 5

Input

the falling edge of the Data Strobe signal, and

 

11

29

 

Data 6

Input

 

 

 

 

must stay high for at least 0.5 μs after the rising

 

12

30

 

Data 7

Input

edge.

 

13

31

 

Data 8

Input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

32

 

Input Prime

Input

Reserved (*1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(IN PRM)

 

 

 

 

 

 

15

33

 

Data Strobe

Input

• Strobe pulse for reading data (Data 1 to Data 8).

 

 

 

 

 

 

 

 

 

 

 

 

 

The printer reads data when this signal is low.

 

 

 

 

(DSTB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• The pulse width must be 0.5 μs or more at the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

printer’s receiving terminal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Host Clock

 

This signal is set high when the host requests the

 

 

 

 

 

 

 

 

 

 

 

 

 

reverse data transfer phase (nibble mode).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16

34

 

(Select In)

Input

Reserved (*1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1284 Active

 

This signal goes high to cause the printer to enter the

 

 

 

 

 

 

 

 

 

 

 

 

 

reverse data transfer phase (nibble mode).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5-9

Page 57
Image 57
Fujitsu C145-C037-01EN manual Prm, Dstb