Compatible type non-standard bit wide serial perimeter interface and data transmission method among interfaces

Abstract

The invention relates to a compatible non-standard bit wide serial peripheral interface and a data transmission method between interfaces. The interface comprises data transmission registers with 128 bits of bit-width, a data receiving register and a shift register with 8 to 128 bits of bit-width; the method comprises the following steps: the obtained data is copied to the shift register through the data transmission registers; at the moment of jumping of the current clock signal, the transmission bit of the shift register transmits one bit data, the rest data is moved for one bit towards the direction of the transmission bit in sequence, and the receiving bit receives one bit data; whether the shift register receives electrical level of the full signal is detected; the shift register transmits the received data to the data receiving register; whether the data received by all the data transmission registers are fully copied to the shift register is detected. The interface and the data transmission method have the advantages that the data with unfixed bit-width and to be transmitted can be transmitted under the unpacked condition within the range of 128 bits, the transmission time is shorter, the operation is also more convenient, and the interface and the data transmission method can be widely applied to the communications system.

Description

technical field [0001] The invention relates to data transmission technology, in particular to a compatible non-standard bit width serial peripheral interface and a data transmission method between the interfaces. Background technique [0002] Serial Peripheral Interface (SPI, Serial Peripheral Interface) is a synchronous serial transmission specification introduced by Motorola, and is often used as a serial expansion interface for microcontroller peripheral chips. Such as figure 1 As shown, the serial peripheral interface includes 8-bit or 16-bit data transmission (TXD, Transmitted Exchange Data) register, 8-bit or 16-bit data reception (RXD, ReceiveExchange Data) register and 8-bit or 16-bit shift Bit (shift) register; Wherein, the data sending register sends the data received from the microprocessor to the shift register; The data receiving register sends the data received from the shift register to the local microprocessor; The shift register is based on the clock gener...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the serial peripheral interface in the prior art can only transmit 8-bit or 16-bit packaged data at a time, and after the serial peripheral interface is fixed, the bit width cannot be adjusted; if more than 8 bits are to be transmitted 16-bit or 16-bit data can only be packaged and configured multiple times to complete the data transmission process, which leads to troublesome operation and long transmission time

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