Implementation of I2C-DMA & SPI-DMA Interface: A Comparative Study

摘要

This paper describes the designing and implementation of I2C (master)-DMA and SPI (master)-DMA interface. Direct Memory Access (DMA), being the feature of modern computers and microprocessors permits certain hardware subsystem in a computer machine to access system memory for reading/writing independently of CPU. Sometimes CPU is fully occupied for entire duration of read/write operation and unavailable to perform other work. With DMA, CPU would initiate data transfers and performs other operations while transfer is in progress. For intra-chip serial data transfers, SPI and I2C are used. Both serial protocols are widely used but both have some merits and demerits. In this research work both protocols are interfaced with DMA for SoC (System on Chip) applications and their performance analysis is carried out by implementing on FPGA. VERILOG-HDL is used for designing RTL Code and test-bench verification. Simulations are observed in Modelsim-Altera 6.3 (Quartus II 8.1) simulator.