Fujitsu DL3800 manual Nibble Mode, Pin Return Signal Direc Description Pin No Name

INTERFACE INFORMATION

Nibble Mode

Pin numbers 2 to 9, 15 to 31, and 33 to 35 are the same as the conven- tional mode.

Pin	Return	Signal	Direc-	Description
No.	Pin No.	name	tion
1	19	Host Clock	Input	This signal is set high when
				the host requests the reverse
				data transfer phase (nibble
				mode).
10	28	Printer Clock	Output	Reverse data transfer phase:
				This signal goes high when
				data being sent to the host is
				established.
				Reverse idle phase:
				This signal is set low then
				goes high to interrupt the
				host, indicating that data is
				available.
11	29	Printer Busy	Output	Reverse data transfer phase:
				Data bit 3, data bit 7, then
				forward path (host to printer)
				busy status
12	30	Ack Data Req	Output	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.
13	–	X Flag	Output	Reverse data transfer phase:
				Data bit 1, then data bit 5

D-4 User's Manual