pcie inbound memory window、outbound memory window分别表示什么
时间: 2023-03-05 07:44:34 浏览: 120
PCI Express (PCIe) is a high-speed serial bus standard used to connect computer peripherals to a motherboard. The inbound and outbound memory windows in PCIe refer to the range of memory addresses that can be accessed by a device on the bus.
The inbound memory window refers to the range of memory addresses that a device on the bus can access in the host system's memory. In other words, it is the range of memory addresses that the host system has allowed the device to read from. This is also sometimes referred to as the device's memory-mapped I/O (MMIO) space.
The outbound memory window, on the other hand, refers to the range of memory addresses that a device on the bus can use to access its own memory. In other words, it is the range of memory addresses that the device has been allowed to write to. This is sometimes referred to as the device's direct memory access (DMA) space.
The sizes of these memory windows are typically defined during system initialization, and can vary depending on the specific PCIe implementation and system configuration. The size and location of the memory windows can also be adjusted dynamically by the operating system or device drivers, depending on the specific requirements of the system and the devices connected to it.