The SB1 (SiByte-1) core is a highperformance implementation of the MIPS64 architecture. It features 32kB instruction cache, 32kB data cache, 2 integer pipelines, 2 load/store pipelines and 2 fp pipelines. An SB1 core can issue upto 4 instructions per cycle.
The SB1 core is being used in Broadcom's BCM1250 system on a chip. The BCM1125 is similar but only contains a single SB1 core. The BCM1480 core contain four slightly updated SB1A cores making it the highest performance SOC using the SB1 core family.