Circuit and method for cross clock domain accessing of AHB bus equipment to APB bus equipment
A technology of APB bus and bus equipment, applied in the direction of data processing power supply, electrical digital data processing, instruments, etc., can solve the problems of increasing system power consumption, increasing system error risk, etc., and achieve the effect of reducing power consumption
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[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0023] Such as image 3 As shown, the main processor accesses devices on the AHB bus (such as coprocessors, DMA controllers) through the AHB bus protocol. Through the APB bus, access devices on the APB bus such as UART (Universal Asynchronous Receive / Transmitter) interface, GPIO (General Purpose Input Output) interface, SPI (Serial Peripheral Interface) interface, IIC (Inter-Integrated Circuit) interface, etc. The AHB bus and the APB bus use different clocks, so cross-clock domain processing is required.
[0024] Figure 4 It is a block diagram of an AHB bus device accessing an APB bus device ac...
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