Method and apparatus for assisting CPU startup based on EPLD
A technology for starting the system and hardware configuration, applied in the field of IT applications, to achieve the effect of simplifying the BOM, simple and flexible system configuration, and shielding the details of CPU startup
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[0020] Below in conjunction with accompanying drawing, the implementation of technical scheme is described in further detail:
[0021] The hardware circuit of this system includes: CPU, programmable logic device EPLD.
[0022] The CPU can be a PowerPC, or an ARM processor or other high-end processor, responsible for the control, operation, communication and other functions of the single board or system. After power-on, the built-in Boot of the CPU starts to read the hardware configuration word of the specific pin. , the configuration word determines the CPU big and small endian mode, start address, main frequency and other system configuration information. After the CPU gets the above information, it will read the ROM inside the EPLD through the local bus according to the specified hardware configuration word. The ROM is generated by using the IP CORE inside the EPLD.
[0023] The programmable logic device EPLD has the characteristics of fast start-up when power-on, and the c...
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