A Novel Bitstream Compression Method for FPGA
Wang Ch · Fudan xuebao. Ziran Kexue ban · 2014
In order to reduce the continuously increasing memory cost and downloading time overhead of FPGA bitstream,a novel bitstream compression method is proposed.Based on the local and sparse bit distribution existing in bitstream,our method encodes symbols that have fewer 1-bits with high frequency.We have experimented on the Virtex-4 bitstream and analyzed the impact made by symbol length and compression threshold and find that the algorithm may have optimal results given proper selections.Compared to LZSS,another practical bitstream compression method,the simulation results demonstrate that our method can achieve compression ratios 8% —12% better than that of LZSS.Moreover,our compression method is easy to implement with hardware.