參數(shù)資料
型號: W83C554F
英文描述: W83C554F Highly Integrated System I/O Controller for Power PC TM (South Bridge) & UltraDMA/33 IDE Controller QFP 208
中文描述: W83C554F高度集成的系統(tǒng)的I / O控制器的Power PC商標(biāo)(南橋)
文件頁數(shù): 65/159頁
文件大?。?/td> 3991K
代理商: W83C554F
W83C553F
Electrical Specifications
WINBOND SYSTEMS LABORATORY
62
BIOS Timer Base Address Register (default = 0078h)
Type:
Read/Write
Function:
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.
Bit Description
:
Bits [15:2]:
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.
Bit 1:
Reserved.
Bit 0:
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].
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