M1 Core The M1 Core is a 32-bit RISC CPU compatible with GCC. It is so simple that it can be used for didactical purposes.
S1 Core The S1 Core is a reduced version of the OpenSPARC T1 released by Sun Microsystems. While the T1 is a complete microprocessor with 8 cores (capable of running up to 32 concurrent threads) and includes a crossbar switch, L2 Caches and several other interfaces, the S1 takes only one 64-bit SPARC v9 core (capable of running up to 4 concurrent threads) and includes a Wishbone Master Interface to connect to the cores available on OpenCores.
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