use work.common_pkg.all;
use work.alu_pkg.all;
+use work.gpm_pkg.all;
+use work.extension_pkg.all;
architecture behav of execute_stage is
signal op_detail : op_opt_t;
signal left_operand, right_operand : gp_register_t;
signal alu_state, alu_nxt : alu_result_rec;
-
signal psw : status_rec;
+ -- extension signals
+ signal ext_gpmp : extmod_rec;
+ signal data_out : gp_register_t;
+
+
+
+type exec_internal is record
+ result : gp_register_t;
+ res_addr : gp_addr_t;
+ alu_jump : std_logic;
+ brpr : std_logic;
+ wr_en : std_logic;
+end record;
+
+signal reg, reg_nxt : exec_internal;
begin
alu_inst : alu
port map(clk, reset, condition, op_group,
- op_detail, left_operand, right_operand, alu_state, alu_nxt);
+ left_operand, right_operand, dec_instr.displacement, op_detail, alu_state, alu_nxt,addr,data);
+
+
+
+ gpmp_inst : extension_gpm
+ generic map (RESET_VALUE)
+ port map (
+ clk,
+ reset,
+ ext_gpmp,
+ data_out,
+ alu_nxt,
+ psw
+
+ );
-syn: process(sys_clk, reset)
+
+
+syn: process(clk, reset)
begin
- if (reset = RESET_VALUE) then
- condition <=
- elsif rising_edge(sys_clk) then
-
+ if reset = RESET_VALUE then
+ reg.alu_jump <= '0';
+ reg.brpr <= '0';
+ reg.wr_en <= '0';
+ reg.result <= (others =>'0');
+ reg.res_addr <= (others => '0');
+ elsif rising_edge(clk) then
+ reg <= reg_nxt;
end if;
end process;
-asyn: process(reset,condition)
+asyn: process(reset,dec_instr, alu_nxt, psw, reg,left_operand,right_operand)
begin
condition <= dec_instr.condition;
op_group <= dec_instr.op_group;
op_detail <= dec_instr.op_detail;
- left_operand <= dec_instr.src1;
- right_operand <= dec_instr.src2;
+
+
- alu_state.status <= psw;
- alu_state.result_addr <= dec_instr.daddr;
- alu_state.brpr <= brpr;
- alu_state.reg_op <= '0';
- alu_state.mem_op <= '0';
- alu_state.
+ alu_state <= (reg.result,dec_instr.daddr,psw,'0',dec_instr.brpr,'0','0','0','0','0','0');
+
if reset = RESET_VALUE then
condition <= COND_NEVER;
else
end if;
+
+ reg_nxt.brpr <= alu_nxt.brpr;
+ reg_nxt.alu_jump <= alu_nxt.alu_jump;
+ reg_nxt.wr_en <= alu_nxt.reg_op;
+ reg_nxt.result <= alu_nxt.result;
+ reg_nxt.res_addr <= alu_nxt.result_addr;
end process asyn;
+forward: process(regfile_val, reg_we, reg_addr, dec_instr)
+begin
+ left_operand <= dec_instr.src1;
+ right_operand <= dec_instr.src2;
+
+ if reg_we = '1' then
+ if dec_instr.saddr1 = reg_addr then
+ left_operand <= regfile_val;
+ end if;
+ if (dec_instr.saddr2 = reg_addr) and (dec_instr.op_detail(IMM_OPT) = '0') then
+ right_operand <= regfile_val;
+ end if;
+ end if;
+end process forward;
+
+result <= reg.result;
+result_addr <= reg.res_addr;
+alu_jump <= reg.alu_jump;
+brpr <= reg.brpr;
+wr_en <= reg.wr_en;
+dmem <= alu_nxt.mem_op;
+--dmem <= reg.result(4);
+dmem_write_en <= alu_nxt.mem_en;
+--dmem_write_en <= reg.result(0);
+--dmem_write_en <= '1';
+hword <= alu_nxt.hw_op;
+--hword <= reg.result(1);
+byte_s <= alu_nxt.byte_op;
+
+--addr <= alu_nxt.result;
+--data <= right_operand;
+--byte_s <= reg.result(2);
end behav;