中断模式:Latched or LevelSensitive 有什么区别?

rt

PCIBus 用 LevelSensitive 中断模式
Isa 用 Latched 中断模式

To: KMK

那么PCIBus的LevelSensitive 和Isa的Latched有什么概念上的不同呢?

To: KMK

那么PCIBus的LevelSensitive 和Isa的Latched有什么概念上的不同呢?

其实Latched为脉冲触发中断,由于脉冲触发如果相应不及时,容易丢中断
LevelSensitive为电平触发,如果不能及时响应,它仍然保持着,直到响应后才降低,所以不会丢中断

在硬件提供中断的方法上来说明一下.

有些中断的提供是把某一个bit置1或0,这种设计好处在一些慢速的机器上中断不会走漏(中断被latched).
另一种是提供一短pluse,在较快的机器上会用到(levelsensitive).

跟bmyyud不一样 !!

在硬件提供中断的方法上来说明一下.

有些中断的提供是把某一个bit置1或0,这种设计好处在一些慢速的机器上中断不会走漏(中断被latched).
另一种是提供一短pluse,在较快的机器上会用到(levelsensitive).

跟bmyyud不一样 !!

我在DDK中找了一些有关东东
KINTERRUPT_MODE
The KINTERRUPT_MODE enumeration type indicates whether an interrupt is level-triggered or edge-triggered.
typedef enum _KINTERRUPT_MODE {
  LevelSensitive,
  Latched
} KINTERRUPT_MODE;


Enumerators
LevelSensitive
The interrupt is level-triggered. This is the mode for traditional PCI line-based interrupts.
电平触发的,(用于慢速机器,这里是偶加的)
Latched
The interrupt is edge-triggered. This is the mode for PCI message-based interrupts.
边沿触发(用于快速机器,这里是偶加的)


Headers
Declared in wdm.h and ntddk.h. Include wdm.h or ntddk.h.

Comments
The interrupt mode is an electrical characteristic of the interrupt. A device signals a level-triggered interrupt by changing the voltage on the interrupt pin, and holding it there until the processor signals that the interrupt is received. In contrast, to signal an edge-triggered interrupt, the device changes the voltage state for a fixed period of time, before reverting to the original voltage state.

OMG ! I was totally mixed up !!!

bmyyyud：我在DDK中找了一些有关东东
KINTERRUPT_MODE
The KINTERRUPT_MODE enumeration type indicates whether an interrupt is level-triggered ...回到原帖

ddk是什么？