use work.extension_pkg.all;
architecture behav of extension_gpm is
+
+type pointers_t is array( 0 to ((2**(paddr_t'length))-1)) of ext_addr_t;
+
type gpm_internal is record
- status : status_rec;
+ status : status_rec;
preg : pointers_t;
end record gpm_internal;
syn : process (clk, reset)
begin
if (reset = RESET_VALUE) then
- reg.status <= ('0','0','0','0');
- reg.pointers <= (others => (std_logic_vector(to_unsigned(DATA_END_ADDR,DATA_ADDR_WIDTH)));
+ reg.status <= (others=>'0');
+ reg.preg <= (others => (std_logic_vector(to_unsigned(DATA_END_ADDR,reg.preg(0)'length))));
elsif rising_edge(clk) then
reg <= reg_nxt;
end if;
end process syn;
-asyn : process (clk, reset, reg, alu_nxt, ext_reg, pval, pwr_en, pinc, paddr)
+asyn : process (clk, reset, reg, psw_nxt, ext_reg, pwr_en, pinc, paddr)
variable reg_nxt_v : gpm_internal;
- variable incb : gp_register_t;
- variable sel_pval : gp_register_t;
+ variable incb : ext_addr_t;
+ variable sel_pval : ext_addr_t;
+
+ variable data_out_v : gp_register_t;
+ variable data_v : gp_register_t;
+ variable tmp_data : gp_register_t;
begin
reg_nxt_v := reg;
+ data_v := ext_reg.data;
psw <= reg.status;
- data_out <= (others => '0');
+
+ data_out_v := (others => '0');
- incb := (others => '0');
incb(0) := '1';
if pinc = '1' then
- incb := (others => '1');
+ incb(incb'high downto 1) := (others => '1');
+ else
+ incb(incb'high downto 1) := (others => '0');
end if;
-
+
if (ext_reg.sel = '1') and ext_reg.wr_en = '1' then
case ext_reg.addr(1 downto 0) is
when "00" =>
if ext_reg.byte_en(0) = '1' then
- reg_nxt_v.psw := (ext_reg.data(0),ext_reg.data(1),ext_reg.data(3),ext_reg.data(2));
- psw <= reg_nxt_v.psw;
+ reg_nxt_v.status := (data_v(0), data_v(1), data_v(3), data_v(2));
+ psw <= reg_nxt_v.status;
end if;
when "01" =>
--STACK_POINTER
+ tmp_data := (others =>'0');
+ tmp_data(tmp_data'high downto BYTEADDR) := reg.preg(0);
+
if ext_reg.byte_en(0) = '1' then
- reg_next_v.preg(0)(byte_t'range) := ext_reg.data(byte_t'range);
+ tmp_data(byte_t'range) := data_v(byte_t'range);
end if;
if ext_reg.byte_en(1) = '1' then
- reg_next_v.preg(0)((byte_t'length*2)-1 downto byte_t'length) :=
- ext_reg.data((byte_t'length*2)-1 downto byte_t'length) ;
+ tmp_data((2*byte_t'length-1) downto byte_t'length) := data_v((2*byte_t'length-1) downto byte_t'length);
end if;
if ext_reg.byte_en(2) = '1' then
- reg_next_v.preg(0)((byte_t'length*3)-1 downto byte_t'length*2) :=
- ext_reg.data((byte_t'length*3)-1 downto byte_t'length*2) ;
+ tmp_data((3*byte_t'length-1) downto 2*byte_t'length) := data_v((3*byte_t'length-1) downto 2*byte_t'length);
end if;
if ext_reg.byte_en(3) = '1' then
- reg_next_v.preg(0)((byte_t'length*4)-1 downto byte_t'length*3) :=
- ext_reg.data((byte_t'length*4)-1 downto byte_t'length*3) ;
+ tmp_data((4*byte_t'length-1) downto 3*byte_t'length) := data_v((4*byte_t'length-1) downto 3*byte_t'length);
end if;
+
+ reg_nxt_v.preg(0) := tmp_data(tmp_data'high downto BYTEADDR);
when others => null;
end case;
end if;
-
- if (ext_reg.sel = '1') and wr_en = '0' then
+
+
+ if (ext_reg.sel = '1') and ext_reg.wr_en = '0' then
case ext_reg.addr(1 downto 0) is
when "00" =>
if ext_reg.byte_en(0) = '1' then
- data_out(3 downto 0) <= (reg.status.sign, reg.status.carry, reg.status.oflo, reg.status.zero);
+ data_out_v(3 downto 0) := (reg.status.sign, reg.status.carry, reg.status.oflo, reg.status.zero);
end if;
when "01" =>
--STACK_POINTER
- if ext_reg.byte_en(0) = '1' then
- data_out(byte_t'range) <= reg.preg(0)(byte_t'range);
- end if;
- if ext_reg.byte_en(1) = '1' then
- data_out((byte_t'length*2)-1 downto byte_t'length) <=
- reg_preg(0)((byte_t'length*2)-1 downto byte_t'length) ;
- end if;
- if ext_reg.byte_en(2) = '1' then
- data_out((byte_t'length*3)-1 downto 2*byte_t'length) <=
- reg_preg(0)((byte_t'length*3)-1 downto 2*byte_t'length) ;
- end if;
- if ext_reg.byte_en(3) = '1' then
- data_out((byte_t'length*4)-1 downto 3*byte_t'length) <=
- reg_preg(0)((byte_t'length*4)-1 downto 3*byte_t'length) ;
- end if;
+ data_out_v(data_out_v'high downto BYTEADDR) := reg.preg(0);
when others => null;
end case;
end if;
-
- sel_pval := reg_nxt_v.preg(unsigned(paddr));
- pval <= sel_pval;
+ sel_pval:= reg_nxt_v.preg(to_integer(unsigned(paddr)));
+
if pwr_en = '1' then
reg_nxt_v.preg(to_integer(unsigned(paddr))) := std_logic_vector(unsigned(sel_pval)+unsigned(incb));
end if;
- reg_nxt_v.status := alu_nxt.status;
+ reg_nxt_v.status := psw_nxt;
reg_nxt <= reg_nxt_v;
+ data_out <= data_out_v;
+
+ pval <= (others =>'0');
+ pval(pval'high downto BYTEADDR) <= sel_pval;
end process asyn;
end behav;
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