For more information, see Interrupts from SPB-Connected Peripheral Devices.The purpose of this Privacy Policy (the “Policy”) is to describe how we collect, use, store, protect, and disclose personal data online and offline. The interrupt service routine (ISR) for an SPB-connected peripheral device must run at IRQL = PASSIVE_LEVEL so that it can synchronously send I/O requests to serially access the hardware registers of the device over the SPB. Instead, an SPB-connected peripheral device signals an interrupt through a separate hardware path that lies outside of both the SPB and the SPB controller. For more information, see Connection IDs for SPB-Connected Peripheral Devices.Īn SPB provides no bus-specific means to convey interrupt requests from peripheral devices to the processor.
An SPB-connected peripheral device is not memory mapped and can be accessed only through the SPB. However, the hardware resources for the device do not include memory for device registers.
#Spb ms driver
Other hardware resources might include an interrupt to which the driver connects its ISR. The connection ID encapsulates the information (for example, a bus address and a bus clock frequency) that an SPB controller requires to establish a connection to the device. Included in these resources is a connection ID that identifies the device's connection to the SPB. During system startup, the ACPI firmware in the hardware platform enumerates the SPB-connected peripheral devices for the Plug and Play manager, and specifies the hardware resources that are dedicated to each device. Even if a peripheral device can be unplugged from a slot on an SPB, the slot is typically dedicated to this device. Peripheral devices typically have fixed connections to an SPB and cannot be removed. Similarly, the SoC module in a smart phone or other mobile device might use an I☬ bus to connect to a sensor device, such as an accelerometer, a GPS device, or a temperature sensor.Īn SPB is not a Plug and Play bus.
#Spb ms Pc
Because SPBs run at low speeds and require few electrical connections, they are frequently used in applications in which battery power must be conserved.įor example, the PC motherboard in a laptop computer might use an I☬ bus to communicate with a low-speed device that monitors the battery level. Typically, SPBs are used in cost-sensitive applications in which low pin counts and simple connections are more important than data transmission speed.
#Spb ms serial
An integrated circuit requires fewer pins to connect to a serial bus than to a parallel bus, which transmits multiple bits of data per clock cycle. SPBs are frequently used to connect low-speed peripheral devices to motherboard chipsets and System on a Chip (SoC) modules.
#Spb ms drivers
For more information, see SPB Controller Drivers and SPB Peripheral Device Drivers. Starting with Windows 8, hardware vendors can supply Windows drivers to directly control their SPB controllers and their SPB-connected peripheral devices, and to make these devices available for use by the operating system and by applications. In versions of Windows before Windows 8, the operating system obtained information from SPB-connected devices on a PC motherboard only indirectly through the platform firmware. This driver might support a family of peripheral devices across a variety of hardware platforms that provide compatible SPBs. The hardware vendor for an SPB-connected peripheral device provides an SPB peripheral driver to manage the hardware functions in the peripheral device.
This driver might support a family of similar controller devices. The hardware vendor for an SPB controller device provides an SPB controller driver to manage the hardware functions in the controller. The SPB category includes buses such as I☬ and SPI.
#Spb ms how to
This section describes how to write a driver for a simple peripheral bus (SPB) controller device or for a peripheral device that is connected to an SPB.
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