A Specific Data Transfer Controller for Multiple Crypto IPs in a Security Processor

In a complex security SoC, multiple crypto IP cores are used in real-time, which brings a lot of interruptions to CPU by regular solutions. In this regard, a specific data transfer controller(SDTC) is proposed in this work, which can process encryption and decryption tasks with pipelined operations. Using SDTC to process these tasks can economize CPU source to improve entire performance of SoC. Besides, due to pipeline and embedded structure of crypto IPs, to encrypt/decrypt using SDTC rather than DMA has much higher data transfer rate and much less access to system bus. By simulation result, the solution using SDTC has approximately 0 access to system bus in average and a data transfer rate, which is approximately 2 times as using DMA. As the role of cryptographic algorithm AES-128/192/256 and SM4 are used. The SDTC has been successfully integrated in a security SoC, which will be taped out very soon.