w83c553f Winbond Electronics Corp America, w83c553f Datasheet - Page 78

• Manufacturer Part Number: w83c553f
• Description: System I/o Controller With Pci Arbiter
• Manufacturer: Winbond Electronics Corp America

W83C553F
Function:
PCI Arbiter Priority Control Register 1 (default = E0h)
Type:
Bit Description:
WINBOND SYSTEMS LABORATORY
Bits [7:5]:
Bits [4:3]:
Bits [2:0]:
These register locations are reserved. Software should not attempt to read or write these locations.
Read/Write
Bank [3:1] Rotate Enable. Defaults to 111b (enabled).
Bank 4 Fixed Mode Priority Select.
Bank [3:1] Fixed Mode Priority Select. If 0 upper ones will be chosen, IDEIRQ# priority always
higher than REQ4#
Bit 4
0
0
1
1
3
0
1
0
1
Function
ide –> bk1 –> bk2 –> bk3
bk1 –> bk2 –> bk3 –> ide
bk2 –> bk3 –> ide –> bk1
bk3 –> ide –> bk1 –> bk2
Electrical Specifications
75