w83c554f Winbond Electronics Corp America, w83c554f Datasheet - Page 100

• Manufacturer Part Number: w83c554f
• Description: System I/o Controller With Pci Arbiter & Ultradma/33 Ide Controller
• Manufacturer: Winbond Electronics Corp America

W83C554F
Operational Control Word 1 Register
Function:
Type:
Bit Description:
WINBOND ELECTRONICS CORP. AMERICA
Bits [7:0]:
The Operational Control Word 1 (OCW1) Register sets and clears the mask bits in the Interrupt Mask
(IMR) Register. Each interrupt request line may be selectively masked or unmasked any time after
initialization.
Read/Write
IMR[7:0]. When a "1" is written to any bit in this register, the corresponding IRQx line is
masked. When a "0" is written to any bit in this register, the corresponding IRQx mask bit is
cleared and interrupt requests will again be accepted by the controller.
Note: Masking IRQ2 on 21h will also mask interrupt requests from A1h, which is physically
cascaded to IRQ2.
Register Information
98