at7601fg AME, Inc., at7601fg Datasheet - Page 26

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

26
AT7601F
CRF2 CHIP CONTROL REGISTER 1(Default 0x00)
Bit 7: Power-Down.
Bit 6: Tri-state Control.
Bit 5: Legacy IRQ/DRQ Select.
Bit 4-2: Reserved.
Bit 1: Enable/Disable DRQ.
Bit 0: Enable/Disable IRQ.
CRF3 CHIP CONTROL REGISTER 2(Default 0b0000000s)
Bit 7: Lock Register.
Bit 6-1: Reserved.
Bit 0: Chip Address Mode Select. This bit latches the power-on strapping value on PDIR(pin 40) during system
= 0
= 1
= 0 DRQ enable.
= 1 DRQ disable.
= 0 Pin 45 is defined as A10. To access high bank registers of ECP port, A10 must set high and CS1#
= 0 Chip is operating.
= 1 Chip is power-down.
= 0 Output ports are driving.
= 1 Output ports are tri-state if bit7 is set.
= 0 IRQ enable.
= 1 IRQ disable.
= 0 Unlock
= 1 Configuration mode is locked and exit. The host can access configuration register any more unless
reset.
= 1 Pin 45 is defined as CS2#. Set CS2# to low and keep CS1# high fir accessing high bank registers of
AME, Inc.
system reset.
set low.
ECP port.
Disable PRT legacy mode on IRQ and DRQ selection, then DCR bit 4 is not effective on selecting
Enable PRT legacy mode on IRQ and DRQ selection, then DCR bit 4 is effective on selecting IRQ.
IRQ.
Printer Port Cotroller
Rev. B.02