Fujitsu DL3800 manual Busy

INTERFACE INFORMATION

Data Transmission Timing

In unidirectional mode (conventional Centronics interface), this printer guarantees the received data when the Data and Data Strobe signals from the computer have the following timing with respect to the Busy and Acknowledge signals from the printer.

Data 1 to Data 8

Data Strobe

BUSY

Acknowledge

➤

➤ ➤
T4
T1	T2	T3
➤➤	➤ ➤	➤

T1, T2, T3 > 1 µs

T4 < 1 µs

0 µs < T5 < 3 µs

2 µs < T6 < 6 µs

T5

➤ ➤

T6

➤

➤

In bidirectional mode (nibblemode), this printer can send data to the computer. Data is sent in units of four bits (nibble) using four output signal lines as data paths. The following outlines one byte of data sent during reverse data transfer phase in nibble mode.

1284 Active

(from CPU)

Data Available (*)

X Flag

Ack Data Req

Printer Busy

Printer Clock

Host Busy

(from CPU)

Data bit 0

Data bit 1

Data bit 2

Data bit 3

Data bit 4

Data bit 5

Data bit 6

Data bit 7

* Data Available is assigned for the cable.

D-6 User's Manual