System and method for serial-peripheral-interface data transmission

#1. Field of the Invention

#The invention relates to data transmission, and more particularly to Serial-Peripheral-Interface (SPI) data transmission.

#2. Description of the Related Art

#The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

#FIG. 1 is a block diagram of a conventional system 100 for SPI data transmission;

#FIG. 2 is a conventional schematic diagram of signals communicated between an SPI controller and an SPI slave of FIG. 1;

#The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.

#FIG. 3 is a block diagram of a system 300 for Serial-Peripheral-Interface (SPI) data transmission according to the invention. The system 300 includes an SPI controller 310 and an SPI slave 320. After receiving data from a Peripheral Component Interconnect (PCI) bus, the SPI controller 310 implements transmission of received data to the SPI slave 320. The SPI slave 320 operates according to a clock signal.

#The SPI controller 310 includes a buffer 312. The SPI slave 320 includes a buffer 322 and a memory 324, wherein the size of the buffer 322 greatly exceeds the size of the buffer 312. In one embodiment, the size of the buffer 312 is 2I bytes, the size of the buffer 322 is 2J bytes, and the size of the buffer 322 is 2(J-I) times of the size of the buffer 312, wherein I and J are natural numbers. For example, the size of the buffer 322 is 256 bytes, while the size of the buffer 312 can only be 16 bytes, and the size of the buffer 322 is 16 times the size of the buffer 312.