W83C553F Datasheet, PDF (78/159 Pages) Winbond – SYSTEM I/O CONTROLLER WITH PCI ARBITER

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