W83877ATG Nuvoton Technology Corporation of America, W83877ATG Datasheet - Page 97

• Manufacturer Part Number: W83877ATG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83877ATG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

7.3.7
Data bytes may be read, written, or DMAed to or from the system to this FIFO in any direction.
Data in the tFIFO will not be transmitted to the parallel port lines. However, data in the tFIFO may be
displayed on the parallel port data lines.
7.3.8
This register is a read-only register. When it is read, 10H is returned. This indicates to the system that
this is an 8-bit implementation.
7.3.9
The bit definitions are as follows:
Bit 7: This bit is read-only. It is at low level during a read. This means that this chip does not support
Bit 6: Returns the value on the ISA IRQ line to determine possible conflicts.
Bit 5-3: Reflect the IRQ resource assigned for ECP port.
Bit 2-0: These five bits are at high level during a read and can be written
hardware RLE compression.
cnfgB[5:3]
tFifo (Test FIFO Mode) Mode = 110
cnfgA (Configuration Register A) Mode = 111
cnfgB (Configuration Register B) Mode = 111
000
001
010
011
100
101
110
111
reflect other IRQ resources selected by PnP register (default)
IRQ7
IRQ9
IRQ10
IRQ11
IRQ14
IRQ15
IRQ5
7
6
5
4
IRQ resource
3
- 90 -
1
2
1
1
W83877ATF/W83877ATG
0
1
IRQx 0
IRQx 1
IRQx 2
compress
intrValue
.