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https://opencores.org/ocsvn/xucpu/xucpu/trunk
[/] [xucpu/] [trunk/] [src/] [system/] [S2CPU.vhdl] - Diff between revs 32 and 33
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Rev 33 |
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Line 18... |
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END ENTITY S2CPU;
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END ENTITY S2CPU;
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ARCHITECTURE Structural OF S2CPU IS
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ARCHITECTURE Structural OF S2CPU IS
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SIGNAL PC : INTEGER RANGE 0 TO 32767 := 0;
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BEGIN -- ARCHITECTURE Structural
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BEGIN -- ARCHITECTURE Structural
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-- purpose: Let counter run to fetch instructions
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-- type : combinational
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-- inputs : CLK,RST
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-- outputs: O_INSTR_ADDR
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IF1: PROCESS (CLK,RST) IS
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BEGIN -- PROCESS IF1
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IF rising_edge(CLK) THEN
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IF rst = '1' THEN
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PC <= 0;
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ELSE
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IF PC = 32767 THEN
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PC <= 0;
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ELSE
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PC <= PC + 1;
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END IF;
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END IF;
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END IF;
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END PROCESS IF1;
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O_IF <= '1';
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O_INSTR_ADDR <= STD_LOGIC_VECTOR(to_unsigned(PC, 15));
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END ARCHITECTURE Structural;
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END ARCHITECTURE Structural;
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