w83c553f Winbond Electronics Corp America, w83c553f Datasheet - Page 65
w83c553f
Manufacturer Part Number
w83c553f
Description
System I/o Controller With Pci Arbiter
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83C553F.pdf
(159 pages)
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W83C553F
BIOS Timer Base Address Register (default = 0078h)
Type:
Function:
Bit Description:
WINBOND SYSTEMS LABORATORY
Bits [15:2]:
Bit 1:
Bit 0:
Read/Write
The base address for the BIOS Timer Register located in PCI I/O space. The BIOS Timer resides in the
W83C553F and is the only internal resource mapped to PCI I/O space.
BTMRBA. BIOS Timer Base Address. This register specifies the Base Address 15:2 for the
BIOS Timer register located in the I/O space. The lower two bits of the base address are 00
(Dword aligned). The value of this register points to 78h (0000_0000_0111_10xx) after a reset.
Reserved.
BTMRE. Timer Enable. When this bit is set to "1", the BIOS timer function is enabled and the
base address of the timer registers is programmed in Bits [15:2].
Electrical Specifications
62
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