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): 98/159頁
文件大小: 3991K
代理商: W83C554F
W83C553F
Electrical Specifications
WINBOND SYSTEMS LABORATORY
95
Operational Control Word 2 Register
Function
:
The Operational Control Word 2 (OCW2) Register controls both the Rotate Mode, End of Interrupt
Mode and combinations of the two.
Type
:
Write Only
Bit Description
:
Bits [7:5]:
ROT, SELLEVEL and EOI. These three bits control the Rotate, End of Interrupt (EOI) Modes
and combinations of the two, as shown below:
Bit 7
Bit 6
Bit 5
Mode
0
0
0
Rotate in Automatic EOI Mode (clear).
0
0
1
Non-specific EOI command
0
1
0
No operation
0
1
1
Specific EOI command
1
0
0
Rotate in Automatic EOI Mode (set)
1
0
1
Rotate on non-specific EOI command
1
1
0
*Set Priority Command
1
1
1
*Rotate on specific EOI command
*Level 0 - Level 2 are used (bits [2:0])
Bits [4:3]:
OCW2SEL[1:0]. OCW2 Selects. When selecting OCW2, these bits must be "00." If bit 4 is
"1," the interrupt controller interprets the write to this port as an ICW1.
Bits [2:0]:
LEVEL[2:0]. These bits determine the interrupt level acted upon when the SC bit (6) is active,
as shown below.
Bit 2
Bit 1
Bit 0
Interrupt Level
0
0
0
IRQ0 (8)
0
0
1
IRQ1 (9)
0
1
0
IRQ2 (10)
0
1
1
IRQ3 (11)
1
0
0
IRQ4 (12)
1
0
1
IRQ5 (13)
1
1
0
IRQ6 (14)
1
1
1
IRQ7 (15)
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