The STi5100 is a low-cost interactive set-top box decoder from ST company. It has ST20 32-bit VL-RISC CPU, 243 MHz frequency, 8Kbyte ICache, 8Kbyte DCache, 4Kbyte SRAM, supports DVB and DIRECTV, integrates DES-ECB, DVB and ICAM descramblers, supports NDS RASP as well as low cost DVB-CI and Cable Card, supports MPEG-2 MP@ML video decoder, has smooth fast forward and rewind functions, and supports audio.