core.sfl | Codetter（こーどったー）

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    stage read_prg {
        state_name st1,st2;
        first_state st1;
        state st1 if(sram.ack & ^read_chr.do){
            sram.read(0b000 || prg_adrs);
            goto st2;
        }
        state st2 if(sram.ack){
            prg_rdata := sram.rdata<7:0>;
            goto st1;
            finish;
        }
    }
    stage read_chr {
        state_name st1,st2;
        first_state st1;
        state st1 if(sram.ack){
            sram.read(0b00100 || chr_adrs);
            goto st2;
        }
        state st2 if(sram.ack){
            chr_rdata := sram.rdata<7:0>;
            goto st1;
            finish;
        }
    }
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