==== Implementations of free CPU's on Spartan-6 ===

Implemented only the CPU without ROM, RAM and IO

^ CPU ^ Option ^ Max clock ^ Pipeline ^ Slice Registers ^ Slice LUTs ^ Occupied Slices ^ LUT Flip Flop pairs ^
| [[http://opencores.org/project,storm_core|Storm]] | | 87 Mhz | 7 | 996 | 1,807 | 607 | 1,987 |
| [[http://opencores.org/project,ion|Ion]] | | 95 Mhz | 3 | 430 | 1,915 | 568 | 1,935 |
| [[http://opencores.org/project,plasma|Plasma]] | +MUL | 75 Mhz | 3 | 399 | 1,906 | 585 | 1,914 |
| [[http://opencores.org/project,plasma|Plasma]] | -MUL | 93 Mhz | 3 | 260 | 1,700 | 514 | 1,707 |
| [[http://opensource.zylin.com/zpu.htm|ZPU4]] | medium | 130 Mhz | No | 421 | 980 | 314 | 1,069 |
| [[http://opencores.org/project,mblite|MB-Lite]] | +MUL +BARREL | 62 Mhz | 5 | 347 | 1,023 | 357 | 1,076 |
| [[http://opencores.org/project,mblite|MB-Lite]] | -MUL -BARREL | 140 Mhz | 5 | 340 | 820 | 256 | 845 |
| [[https://github.com/f32c/f32c|f32c]] | +rom +uart | 110 Mhz | 5 | 522 | 1106 | 310 | 1057 |