Relatively few modern chips directly expose the CPU bus. Any devices or interfaces that are required for the project but not part of the basic platform must be designed into the interface. The platform comes with some set of I/O devices and interfaces. We can always combine smaller words to perform wider integer operations or to perform floating-point operations in software, but software-implemented extended arithmetic requires additional CPU time. The arithmetic precision required for I/O processing is affected by the choice of CPU.
CPU SPEED ACCELERATOR DRIVER
CPUs themselves can introduce dozens of clock cycles of processing time into the interrupt the interrupt driver itself adds more overhead as it saves and restores registers. Interrupt latency is a critical design parameter for high-speed I/O processing. The maximum available utilization of the CPU depends in part on the real-time scheduling algorithm used. We cannot exceed 100% utilization that would require more CPU time than is available. We are generally interested in worst-case utilization over any interval. Utilization may vary over the course of operation as the workload varies. We often express utilization as a percentage. CPU performance should be evaluated not on the basis of generic workloads but by using workloads that reflect the characteristics of the target application. A CPU that works well for one workload may perform poorly for another workload. There is no one best choice for a CPU instruction set or microarchitecture.
We should keep in mind that CPU performance depends on a number of factors.
CPU SPEED ACCELERATOR SOFTWARE
A system with a large software load may leave few cycles for interface-oriented operations, no matter how much performance it provides. But performance can also be evaluated relative to the rest of the application. CPU performance may enforce absolute limits-it may not run fast enough to perform, for example, digital filtering operations. In these cases, the platform selection process must balance these potentially competing factors.ĬPU performance determines what part of the system functionality can be put in software. However, modern platforms often take the form of a single-chip microcontroller or system-on-chip. If our platform is built from several chips, we may be able to separate these choices to some degree. A hardware abstraction layer (HAL), board support package (BSP), or basic input/output system (BIOS).
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