instr_s.signext := '0';
instr_s.bp := '0';
instr_s.op_detail := (others => '0');
+ instr_s.displacement := (others => '0');
instr_s.op_group := ADDSUB_OP;
-- when "01110" => --ldw
instr_s.reg_dest_addr := instruction(22 downto 19);
instr_s.reg_src1_addr := instruction(18 downto 15);
- instr_s.immediate(15 downto 0) := instruction(18 downto 3);
instr_s.signext := instruction(2);
instr_s.high_low := instruction(1);
+ instr_s.displacement(14 downto 0) := instruction(14 downto 0);
+
+ instr_s.op_group := LDST_OP;
+ instr_s.op_detail(NO_PSW_OPT) := '1';
+
+ if (instr_s.displacement(14) = '1') then
+ instr_s.displacement(31 downto 15) := (others => '1');
+ end if;
+
+ if (instr_s.opcode = "11010") then --ldi
+ if (instr_s.high_low = '1') then
+ instr_s.immediate(31 downto 16) := instruction(18 downto 3);
+ instr_s.immediate(15 downto 0) := (others => '0');
+ else
+ instr_s.immediate(15 downto 0) := instruction(18 downto 3);
+ instr_s.immediate(31 downto 16) := (others => '0');
+
+ --instr_s.immediate(11 downto 0) := instruction(14 downto 3);
+ --instr_s.immediate(WORD_WIDTH-1 downto 12) := (others => '0');
+ end if;
- if (instr_s.opcode = "11010") then
if (instr_s.signext = '1' and instr_s.immediate(11) = '1') then
instr_s.immediate(31 downto 16) := (others => '1');
end if;
- instr_s.immediate(14 downto 0) := instruction(14 downto 0);
- instr_s.immediate(WORD_WIDTH-1 downto 15) := (others => '0');
+
instr_s.op_detail(IMM_OPT) := '1';
end if;
end if;
if (instr_s.opcode = "01111" or instr_s.opcode = "10001" or instr_s.opcode = "10011" or instr_s.opcode = "10101") then
--when "01111" => --stw
- instr_s.reg_src1_addr := instruction(22 downto 19); -- register value
- instr_s.reg_src2_addr := instruction(18 downto 15); -- mem addr
- instr_s.immediate(14 downto 0) := instruction(14 downto 0);
+ instr_s.reg_src2_addr := instruction(22 downto 19); -- register value
+ instr_s.reg_src1_addr := instruction(18 downto 15); -- mem addr
+ instr_s.displacement(14 downto 0) := instruction(14 downto 0);
+ instr_s.op_detail(NO_PSW_OPT) := '1';
+ instr_s.op_detail(ST_OPT) := '1';
+ instr_s.op_group := LDST_OP;
+
+ if (instr_s.displacement(14) = '1') then
+ instr_s.displacement(31 downto 15) := (others => '1');
+ end if;
end if;
-- when "10001" => --sth
instr_s.bp := instruction(1);
instr_s.jmptype := instruction(3 downto 2);
instr_s.signext := instruction(0);
+ instr_s.op_detail(NO_PSW_OPT) := '1';
+
+
+ if (instr_s.opcode = "10110") then
+ instr_s.op_detail(IMM_OPT) := '1';
+ else
+ instr_s.immediate(31 downto 0) := (others => '0');
+ instr_s.op_detail(JMP_REG_OPT) := '1';
+ instr_s.op_detail(IMM_OPT) := '1';
+ end if;
+
+ if (instr_s.signext = '1' and instr_s.immediate(15) = '1') then
+ instr_s.immediate(31 downto 16) := (others => '1');
+ end if;
+
+ if (instr_s.jmptype = "00") then
+-- instr_s.op_detail(SUB_OPT) := not instr_s.opcode(0);
+ instr_s.op_group := JMP_OP;
+ end if;
+
+ if (instr_s.jmptype = "01") then
+ instr_s.op_group := JMP_ST_OP;
+ -- instr_s.op_detail(RET_OPT) := '0';
+ end if;
+
+ if (instr_s.jmptype = "10") then
+ instr_s.op_group := JMP_ST_OP;
+ instr_s.op_detail(RET_OPT) := '1';
+ end if;
+
+ if (instr_s.predicates = "1111" or instr_s.jmptype = "10") then
+ instr_s.bp := '0';
+ end if;
end if;
-- when "10111" => --brreg