mips_sys

implemented jump register instructions
Parent a077c55
Stefan Schuermans

Stefan Schuermans commited on 2012-02-10 22:56:14
Showing 1 changed files, with 4 additions and 2 deletions.

mips/core.vhd
View file @ 999fc47
... ... 
@@ -396,16 +396,18 @@ BEGIN
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         END IF;
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     END PROCESS p_reg_wr;
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-    p_next_pc: PROCESS(r_pc, r_op, r_imm, s_cmp_res, r_imm_16, r_imm_26)
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+    p_next_pc: PROCESS(r_pc, r_op, r_imm, s_cmp_res, r_imm_16, r_imm_26, s_val_s)
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         VARIABLE v_pc:  signed(31 DOWNTO 0);
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         VARIABLE v_rel: signed(17 DOWNTO 0);
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     BEGIN
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         IF r_op = op_j AND s_cmp_res = '1' THEN
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             IF r_imm = imm_26 THEN
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                 n_pc <= r_pc(31 DOWNTO 28) & r_imm_26 & "00";
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-            ELSE
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+            ELSIF r_imm = imm_16se THEN
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                 n_pc <= std_logic_vector(signed(r_pc) +
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                                          signed(r_imm_16 & "00"));
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+            ELSE
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+                n_pc <= s_val_s;
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             END IF;
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         ELSE
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             n_pc <= std_logic_vector(signed(r_pc) + to_signed(4, 32));
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