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  • This comparison shows the changes necessary to convert path
    /zipcpu
    from Rev 63 to Rev 64
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Rev 63 → Rev 64

/trunk/rtl/cpudefs.v
110,6 → 110,17
// Be aware, though, it will drop your performance by a factor between 2x and
// 3x.
//
// We can either pipeline our fetches, or issue one fetch at a time. Pipelined
// fetches are more complicated and therefore use more FPGA resources, while
// single fetches will cause the CPU to stall for about 5 stalls each
// instruction cycle, effectively reducing the instruction count per clock to
// about 0.2. However, the area cost may be worth it. Consider:
//
// Slice LUTs ZipSystem ZipCPU
// Single Fetching 2521 1734
// Pipelined fetching 2796 2046
// (These numbers may be dated, but should still be representative ...)
//
// I recommend only defining this if you "need" to, if area is tight and
// speed isn't as important. Otherwise, just leave this undefined.
//

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