at7601fg AME, Inc., at7601fg Datasheet - Page 8

• Manufacturer Part Number: at7601fg
• Description: Printer Port Controller
• Manufacturer: AME, Inc.

8
AT7601F
5-2-3 EPP Address Port
The address port is available only in EPP mode. Bit definitions are as follows:
Bit 3 SLIN (PRINTER SELECT INPUT)
This bit is inverted and output onto the SLIN# output. A logic 1 on this bit selects the printer; a logic 0
means the printer is not selected.
Bit 2 INIT# (INITIATE OUTPUT)
A 0 starts the printer (50 microsecond pulse, minimum).
Bit 1 AFD (AUTOFEED)
This bit is inverted and output onto the AFD# output. A logic 1 causes the printer to generate a line feed
after each line is printed. A logic 0 means no autofeed.
Bit 0 STB (STROBE)
A 0.5 microsecond minimum high active pulse clocks data into the printer. Valid data must be present for a
minimum of 0.5 microseconds before and after the strobe pulse. This bit is inverted and output onto the
STB# output.
The contents of DB0-DB7 are b uffered (non- inverting) and output to ports PD0-PD7 during a write
operation. The leading edge of LOW causes an EPP address write cycle to be performed, and
the trailing edge of LOW latches the data for the duration of the EPP write cycle.
PD0-PD7 ports are read during a read operation. The leading edge of IOR causes and EPP address read
cycle to be performed and the data to be output to the host CPU.
AME, Inc.
7
6
ADDRESS OFFSET = 03H
5
4
3
2
1
Printer Port Cotroller
0
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
Rev. B.02