MVME2100  MOTOROL 中规模集成电路

MVME2100  MOTOROL 中规模集成电路

MSI(首先在PCI 2.2中定义)允许设备分配1、2、4、8、16或32个中断。该设备被编程为具有要写入的地址(通常是中断控制器)，以及一个16位数据字来标识它。中断号被添加到数据字中以识别中断。[1]有些平台，如Windows，并不使用所有32个中断，而是最多使用16个中断。

MSI-X(首先在PCI 3.0中定义)允许一个设备分配多达2048个中断。发现原始MSI使用的单个地址对于某些体系结构是限制性的。特别是，它很难将单个中断指向不同的处理器，这在一些高速网络应用程序中很有帮助。MSI-X允许更多的中断，并给每个中断一个单独的目标地址和数据字。带有MSI-X的设备不一定支持2048中断。 

MVME2100  MOTOROL 中规模集成电路

MSI (first defined in PCI 2.2) allows devices to assign 1, 2, 4, 8, 16 or 32 interrupts. The device is programmed to have an address to be written (usually an interrupt controller) and a 16-bit data word to identify it. The interrupt number is added to the data word to identify the interrupt. [1] Some platforms, such as Windows, do not use all 32 interrupts, but use up to 16 interrupts.

MSI-X (first defined in PCI 3.0) allows a device to allocate up to 2048 interrupts. It is found that the single address used by the original MSI is restrictive for some architectures. In particular, it is difficult to point a single interrupt to different processors, which is very helpful in some high-speed network applications. MSI-X allows more interrupts and gives each interrupt a separate destination address and data word. Devices with MSI-X may not necessarily support 2048 interrupts.

MVME2100  MOTOROL 中规模集成电路

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