at7601fg AME, Inc., at7601fg Datasheet - Page 16

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

16
AT7601F
5-3-1.8 Cnfg-B (Configuration Register B) Mode = 111
5-3-1.9 ECR (Extended Control Register) Mode = all
Refer to Table A.
The bit definitions are as follows:
Bit 7 Compress: This bit is read only. During a read it is a low level. This means that this chip
does not support hardware RLE compression. It does support hardware de-compression!
Bit 6 IntrValue: Returns the value on the ISA IRQ line to determine possible conflicts.
Bits [3:0] Parallel Port IRQ
Bits [2:0] Parallel Port DMA
Refer to Table B.
This register controls the extended ECP parallel port functions.
Bit 7,6,5: These bits are Read/Write and select the Mode.
AME, Inc.
SELECTED
All Others
IRQ
15
14
11
10
9
7
5
Table A
CONFIG REG B
BITS 5:3
110
101
100
011
010
001
111
000
ADDRESS OFFSET = 402H
ADDRESS OFFSET = 400H
SELECTED
All Others
DMA
3
2
1
Table B
Printer Port Cotroller
CONFIG REG B
BITS 2:0
011
010
001
000
Rev. B.02