use work.gen_pkg.all;
entity parser is
- port
- (
+ port (
sys_clk : in std_logic;
sys_res_n : in std_logic;
-- History
- p_rw : out std_logic;
- p_spalte : out hspalte;
p_rget : out std_logic;
p_rdone : in std_logic;
p_read : in hbyte;
p_wdone : in std_logic;
p_write : out hbyte;
p_finished : out std_logic;
- -- ALU
- opcode : out alu_ops;
- op1 : out csigned;
- op2 : out csigned;
- op3 : in csigned;
- do_calc : out std_logic;
- calc_done : in std_logic;
- -- TODO: calc_error : in std_logic;
-- Scanner
do_it : in std_logic;
finished : out std_logic
end entity parser;
architecture beh of parser is
- type PARSER_STATE is (SIDLE, SREAD_CHAR1, SREAD_CHAR2, SWRITE_CHAR);
+ type PARSER_STATE is (SIDLE, SREAD_NEWNUMBER, SREAD_SPACE_GET,
+ SREAD_SPACE_GET_SIGN, SREAD_SPACE_PROC, SREAD_SPACE_PROC_SIGN, SREAD_OP1, SREAD_OP2,
+ SREAD_SIGN, SREAD_NEXTBYTE, SREAD_CALCNUMBER1, SREAD_CALCNUMBER2, SCALC_1,
+ SCALC_14, SCALC_15, SCALC_2, SWRITE_CHAR0, SWRITE_CHAR1, SWRITE_CHAR2,
+ SWRITE_SIGN1, SWRITE_SIGN2, SDONE, SERROR1, SERROR2, SBLANK1, SBLANK2);
signal state_int, state_next : PARSER_STATE;
- signal z_int, z_next : csigned;
+ signal z_int, z_next, strich_int, strich_next, wtmp_int, wtmp_next : csigned;
+ signal punkt_int, punkt_next : csigned;
signal rbyte_int, rbyte_next : hbyte;
signal p_write_int, p_write_next : hbyte;
signal p_rget_int, p_rget_next : std_logic;
signal p_wtake_int, p_wtake_next : std_logic;
signal p_finished_int, p_finished_next : std_logic;
+ signal finished_int, finished_next : std_logic;
+ signal aktop_int, aktop_next : alu_ops;
+ signal opp_int, opp_next : alu_ops;
+ signal opcode_int, opcode_next : alu_ops;
+ signal op1_int, op1_next : csigned;
+ signal op2_int, op2_next : csigned;
+ signal do_calc_int, do_calc_next : std_logic;
+ signal z_sign_next, z_sign_int : std_logic;
+ signal firstz_next, firstz_int : boolean;
+ signal err_next, err_int : hstr_int;
+ signal errc_next, errc_int : hstr_int;
+ -- ALU
+ signal opcode : alu_ops;
+ signal op1 : csigned;
+ signal op2 : csigned;
+ signal op3 : csigned;
+ signal opM : csigned;
+ signal do_calc : std_logic;
+ signal calc_done : std_logic;
+ signal calc_error : std_logic;
begin
+ instalu : alu
+ port map (
+ sys_clk => sys_clk,
+ sys_res_n => sys_res_n,
+ do_calc => do_calc,
+ calc_done => calc_done,
+ calc_error => calc_error,
+ op1 => op1,
+ op2 => op2,
+ op3 => op3,
+ opM => opM,
+ opcode => opcode
+ );
+
p_write <= p_write_int;
p_rget <= p_rget_int;
p_wtake <= p_wtake_int;
p_finished <= p_finished_int;
+ finished <= finished_int;
+
+ opcode <= opcode_int;
+ op1 <= op1_int;
+ op2 <= op2_int;
+ do_calc <= do_calc_int;
process(sys_clk, sys_res_n)
begin
if sys_res_n = '0' then
state_int <= SIDLE;
z_int <= (others => '0');
+ z_sign_int <= '0';
+ strich_int <= (others => '0');
+ punkt_int <= (others => '0');
+ wtmp_int <= (others => '0');
rbyte_int <= (others => '0');
+ aktop_int <= ALU_NOP;
+ opp_int <= ALU_NOP;
+ err_int <= 0;
+ errc_int <= HSPALTE_MAX;
+ firstz_int <= true;
-- out ports
- p_rw <= '0';
- p_spalte <= (others => '0');
p_rget_int <= '0';
p_write_int <= (others => '0');
p_wtake_int <= '0';
p_finished_int <= '0';
- opcode <= ALU_NOP;
- op1 <= (others => '0');
- op2 <= (others => '0');
- do_calc <= '0';
- finished <= '0';
+ finished_int <= '0';
+ opcode_int <= ALU_NOP;
+ op1_int <= (others => '0');
+ op2_int <= (others => '0');
+ do_calc_int <= '0';
elsif rising_edge(sys_clk) then
-- internal
state_int <= state_next;
z_int <= z_next;
+ z_sign_int <= z_sign_next;
+ strich_int <= strich_next;
+ punkt_int <= punkt_next;
+ wtmp_int <= wtmp_next;
rbyte_int <= rbyte_next;
+ aktop_int <= aktop_next;
+ opp_int <= opp_next;
+ err_int <= err_next;
+ errc_int <= errc_next;
+ firstz_int <= firstz_next;
-- out ports
p_rget_int <= p_rget_next;
p_write_int <= p_write_next;
p_wtake_int <= p_wtake_next;
p_finished_int <= p_finished_next;
+ finished_int <= finished_next;
+ opcode_int <= opcode_next;
+ op1_int <= op1_next;
+ op2_int <= op2_next;
+ do_calc_int <= do_calc_next;
end if;
end process;
-- next state
- process(state_int, do_it, p_rdone, p_wdone, p_read)
- begin
- state_next <= state_int;
+ process(do_it, p_rdone, p_wdone, p_read, aktop_int, strich_int, punkt_int,
+ calc_done, wtmp_int, opp_int, z_sign_int, err_int, errc_int,
+ calc_error, op2_int, state_int, p_write_int, z_int, rbyte_int,
+ p_rget_int, opcode_int, op1_int, op3, opM, do_calc_int,
+ firstz_int)
+ function hbyte2csigned (x : hbyte) return csigned is
+ variable y : csigned;
+ begin
+ case x is
+ when x"30" => y := x"00000000";
+ when x"31" => y := x"00000001";
+ when x"32" => y := x"00000002";
+ when x"33" => y := x"00000003";
+ when x"34" => y := x"00000004";
+ when x"35" => y := x"00000005";
+ when x"36" => y := x"00000006";
+ when x"37" => y := x"00000007";
+ when x"38" => y := x"00000008";
+ when x"39" => y := x"00000009";
+ when others => assert(false) report "hbyte2csigned: shouldn't happen";
+ end case;
+ return y;
+ end function hbyte2csigned;
- case state_int is
- when SIDLE =>
- if do_it = '1' then
- state_next <= SREAD_CHAR1;
- end if;
- when SREAD_CHAR1 =>
- if p_rdone = '1' then
- state_next <= SREAD_CHAR2;
- end if;
- when SREAD_CHAR2 =>
- if p_wdone = '1' then
- state_next <= SWRITE_CHAR;
- end if;
- when SWRITE_CHAR =>
- if rbyte_int = hbyte(to_unsigned(character'pos(character'val(0)), 8)) then
- if do_it = '0' then
- state_next <= SIDLE;
- end if;
- else
- state_next <= SREAD_CHAR1;
- end if;
- end case;
- end process;
+ function csigned2hbyte (x : csigned) return hbyte is
+ variable y : hbyte;
+ begin
+ case x is
+ when x"00000000" => y := x"30";
+ when x"00000001" => y := x"31";
+ when x"00000002" => y := x"32";
+ when x"00000003" => y := x"33";
+ when x"00000004" => y := x"34";
+ when x"00000005" => y := x"35";
+ when x"00000006" => y := x"36";
+ when x"00000007" => y := x"37";
+ when x"00000008" => y := x"38";
+ when x"00000009" => y := x"39";
+ when others => assert(false) report "csigned2hbyte: shouldn't happen";
+ end case;
+ return y;
+ end function csigned2hbyte;
+
+ variable multmp : signed(((2*CBITS)-1) downto 0);
+ variable tmp : csigned;
- process(state_int, p_read, p_write_int, z_int, rbyte_int, p_rget_int)
+ type errstrings is array (natural range 1 to 3) of hstring;
+ constant error_str : errstrings := (
+ 1 => " Fehler: Division durch Null " & nul,
+ 2 => " Fehler: Syntax " & nul,
+ 3 => " Fehler: Over- bzw. Underflow " & nul
+ );
begin
+ state_next <= state_int;
-- internal
z_next <= z_int;
+ z_sign_next <= z_sign_int;
+ strich_next <= strich_int;
+ punkt_next <= punkt_int;
+ wtmp_next <= wtmp_int;
rbyte_next <= rbyte_int;
+ aktop_next <= aktop_int;
+ opp_next <= opp_int;
+ err_next <= err_int;
+ errc_next <= errc_int;
+ firstz_next <= firstz_int;
-- signals
p_rget_next <= '0';
p_write_next <= p_write_int;
p_wtake_next <= '0';
p_finished_next <= '0';
+ finished_next <= '0';
+ opcode_next <= opcode_int;
+ op1_next <= op1_int;
+ op2_next <= op2_int;
+ do_calc_next <= '0';
case state_int is
when SIDLE =>
+ strich_next <= (others => '0');
+ punkt_next <= (0 => '1', others => '0');
+ opp_next <= ALU_NOP;
+ if do_it = '1' then
+ state_next <= SREAD_NEWNUMBER;
+ end if;
+
+ when SREAD_NEWNUMBER =>
z_next <= (others => '0');
+ z_sign_next <= '0';
+ firstz_next <= true;
rbyte_next <= (others => '0');
p_write_next <= (others => '0');
- when SREAD_CHAR1 =>
+ aktop_next <= ALU_NOP;
+ state_next <= SREAD_SPACE_GET;
+
+ when SREAD_SPACE_GET =>
p_rget_next <= '1';
- p_write_next <= (others => '0');
- when SREAD_CHAR2 =>
- rbyte_next <= p_read;
+ if p_rdone = '1' then
+ state_next <= SREAD_SPACE_PROC;
+ end if;
+ when SREAD_SPACE_GET_SIGN =>
+ p_rget_next <= '1';
+ if p_rdone = '1' then
+ state_next <= SREAD_SPACE_PROC_SIGN;
+ end if;
+ when SREAD_SPACE_PROC | SREAD_SPACE_PROC_SIGN =>
+ if p_rdone = '0' then
+ case state_int is
+ when SREAD_SPACE_PROC => state_next <= SREAD_SPACE_GET;
+ when SREAD_SPACE_PROC_SIGN => state_next <= SREAD_SPACE_GET_SIGN;
+ when others => assert(false) report "wtf @ state1";
+ end case;
+ else
+ if p_read = x"2d" and state_int = SREAD_SPACE_PROC then
+ -- vorzeichen?
+ state_next <= SREAD_SIGN;
+ elsif p_read /= x"20" then
+ -- leerzeichen sollen ignoriert werden
+ p_rget_next <= '1';
+ case state_int is
+ when SREAD_SPACE_PROC => state_next <= SREAD_NEXTBYTE;
+ when SREAD_SPACE_PROC_SIGN => state_next <= SREAD_OP1;
+ when others => assert(false) report "SREAD_SPACE_PROC{,_SIGN}: shouldn't happen";
+ end case;
+ end if;
+ end if;
+
+ when SREAD_SIGN =>
+ z_sign_next <= '1';
+ if p_rdone = '0' then
+ state_next <= SREAD_NEXTBYTE;
+ end if;
+ when SREAD_NEXTBYTE =>
+ p_rget_next <= '1';
+ if p_rdone = '1' then
+ state_next <= SREAD_CALCNUMBER1;
+ end if;
+ when SREAD_CALCNUMBER1 =>
+ case p_read is
+ -- '+', '-', '*', '/'
+ when x"2B" | x"2D" | x"2A" | x"2F" | x"00" =>
+ if firstz_int then
+ err_next <= 2;
+ else
+ state_next <= SREAD_OP1;
+ p_rget_next <= '1';
+ end if;
+
+ -- ' '
+ when x"20" =>
+ state_next <= SREAD_SPACE_PROC_SIGN;
+ p_rget_next <= '1';
+
+ when others =>
+ op1_next <= z_int;
+ opcode_next <= ALU_MUL;
+ op2_next <= to_signed(10,CBITS);
+ firstz_next <= false;
+ do_calc_next <= '1';
+ end case;
+ if calc_done = '1' then
+ state_next <= SREAD_CALCNUMBER2;
+ end if;
+ when SREAD_CALCNUMBER2 =>
+ z_next <= op3 + hbyte2csigned(p_read);
+ if p_rdone = '0' and calc_done = '0' then
+ state_next <= SREAD_NEXTBYTE;
+ end if;
+
+ when SREAD_OP1 =>
+ case p_read is
+ when x"2B" => aktop_next <= ALU_ADD; -- '+'
+ when x"2D" => aktop_next <= ALU_SUB; -- '-'
+ when x"2A" => aktop_next <= ALU_MUL; -- '*'
+ when x"2F" => aktop_next <= ALU_DIV; -- '/'
+ when x"00" => aktop_next <= ALU_DONE; -- '\0'
+
+ when others => err_next <= 2;
+ end case;
+ state_next <= SREAD_OP2;
+ when SREAD_OP2 =>
+ if p_rdone = '0' then
+ state_next <= SCALC_1;
+ end if;
+
+ when SCALC_1 =>
+ if z_sign_int = '1' then
+ tmp := (not z_int) + 1;
+ z_next <= tmp;
+ z_sign_next <= '0';
+ else
+ tmp := z_int;
+ end if;
+
+ case opp_int is
+ when ALU_NOP | ALU_ADD | ALU_SUB =>
+ case opp_int is
+ when ALU_SUB =>
+ -- xst (xilinx) workaround
+ if x"80000000" = tmp then
+ -- vgl. testfall 37 und 38
+ err_next <= 3;
+ op1_next <= tmp;
+ else
+ op1_next <= (not tmp) + 1;
+ end if;
+ when others => op1_next <= tmp;
+ end case;
+ case aktop_int is
+ when ALU_ADD | ALU_SUB | ALU_DONE =>
+ opcode_next <= ALU_ADD;
+ op2_next <= strich_int;
+ when ALU_MUL | ALU_DIV =>
+ opcode_next <= ALU_MUL;
+ op2_next <= punkt_int;
+ when others => assert(false) report "SCALC_1/1: shouldn't happen!";
+ end case;
+
+ when ALU_MUL | ALU_DIV =>
+ case aktop_int is
+ when ALU_ADD | ALU_SUB | ALU_DONE | ALU_MUL | ALU_DIV =>
+ op1_next <= punkt_int;
+ opcode_next <= opp_int;
+ op2_next <= tmp;
+ when others => assert(false) report "SCALC_1/2: shouldn't happen!";
+ end case;
+ when others => assert(false) report "SCALC_1/3: shouldn't happen!";
+ end case;
+ do_calc_next <= '1';
+
+ if calc_done = '1' then
+ case opp_int is
+ -- spezialfall: eine zwischenberechnung wird fuer diese
+ -- kombination benoetigt
+ when ALU_MUL | ALU_DIV =>
+ case aktop_int is
+ when ALU_ADD | ALU_SUB | ALU_DONE => state_next <= SCALC_14;
+ when others => state_next <= SCALC_2;
+ end case;
+ when others => state_next <= SCALC_2;
+ end case;
+ end if;
+ when SCALC_14 =>
+ -- ueberpruefung kann man sich sparen, da diese ohnehin in
+ -- nextstate gemacht wird.
+ op1_next <= op3;
+ do_calc_next <= '0';
+
+ if calc_done = '0' then
+ state_next <= SCALC_15;
+ end if;
+ when SCALC_15 =>
+ -- ueberpruefung kann man sich sparen, da diese ohnehin in
+ -- nextstate gemacht wird.
+ opcode_next <= ALU_ADD;
+ op2_next <= strich_int;
+ punkt_next <= (0 => '1', others => '0');
+ do_calc_next <= '1';
+
+ if calc_done = '1' then
+ state_next <= SCALC_2;
+ end if;
+ when SCALC_2 =>
+ case opp_int is
+ when ALU_NOP | ALU_ADD | ALU_SUB | ALU_MUL | ALU_DIV =>
+ case aktop_int is
+ when ALU_ADD | ALU_SUB | ALU_DONE =>
+ if aktop_int = ALU_DONE and op3 < 0 then
+ strich_next <= (not op3) + 1;
+ wtmp_next <= (not op3) + 1;
+ z_sign_next <= '1';
+ else
+ strich_next <= op3;
+ wtmp_next <= op3;
+ end if;
+ when ALU_MUL | ALU_DIV =>
+ punkt_next <= op3;
+ when others => assert (false) report "SCALC_2/1: shouldn't happen!";
+ end case;
+ when ALU_DONE => null;
+ when others => assert (false) report "SCALC_2/2: shouldn't happen!";
+ end case;
+ -- aktuelle rechenoperation fuer naechste 'runde' uebernehmen
+ opp_next <= aktop_int;
+
+ if calc_done = '0' then
+ if aktop_int = ALU_DONE then
+ state_next <= SWRITE_CHAR2;
+ else
+ state_next <= SREAD_NEWNUMBER;
+ end if;
+ end if;
+
+ when SWRITE_CHAR0 =>
+ -- fuer testfall 39 und 40
+ if strich_int = to_signed(-214748364,CBITS) then
+ op1_next <= to_signed(214748364,CBITS);
+ strich_next <= to_signed(214748364,CBITS);
+ else
+ op1_next <= strich_int;
+ end if;
+ opcode_next <= ALU_DIV;
+ op2_next <= to_signed(10,CBITS);
+ do_calc_next <= '1';
+
+ if calc_done = '1' then
+ state_next <= SWRITE_CHAR1;
+ end if;
+ when SWRITE_CHAR1 =>
+ do_calc_next <= '1';
+ p_wtake_next <= '1';
+ tmp := opM;
+ p_write_next <= csigned2hbyte(tmp);
+ wtmp_next <= op3;
+
+ if p_wdone = '1' then
+ errc_next <= errc_int - 1;
+ -- ueberpruefung auf -2147483648 fuer testfall 39 und 40
+ -- x"80000000": xst (xilinx) workaround
+ if strich_int < 10 and strich_int /= x"80000000" then
+ if z_sign_int = '1' then
+ state_next <= SWRITE_SIGN1;
+ else
+ state_next <= SBLANK1;
+ end if;
+ else
+ state_next <= SWRITE_CHAR2;
+ end if;
+ end if;
+ when SWRITE_CHAR2 =>
+ strich_next <= wtmp_int;
+ if p_wdone = '0' and calc_done = '0' then
+ state_next <= SWRITE_CHAR0;
+ end if;
+
+ when SWRITE_SIGN1 =>
+ if p_wdone = '0' then
+ state_next <= SWRITE_SIGN2;
+ end if;
+ when SWRITE_SIGN2 =>
+ if z_sign_int = '1' then
+ p_wtake_next <= '1';
+ p_write_next <= x"2D";
+ else
+ assert(false) report "SWRITE_SIGN: shouldn't happen!";
+ end if;
+
+ if p_wdone = '1' then
+ errc_next <= errc_int - 1;
+ state_next <= SDONE;
+ end if;
+
+ when SBLANK1 =>
+ p_wtake_next <= '1';
+ p_write_next <= x"20";
+ if p_wdone = '1' then
+ errc_next <= errc_int - 1;
+ if errc_int <= 2 then
+ state_next <= SDONE;
+ else
+ state_next <= SBLANK2;
+ end if;
+ end if;
+ when SBLANK2 =>
+ if p_wdone = '0' then
+ state_next <= SBLANK1;
+ end if;
+
+ when SERROR1 =>
p_wtake_next <= '1';
- p_write_next <= p_read;
- when SWRITE_CHAR =>
- if rbyte_int = hbyte(to_unsigned(character'pos(character'val(0)), 8)) then
- p_finished_next <= '1';
+ p_write_next <= hbyte(to_unsigned (character'pos(error_str(err_int)(errc_int)),8));
+ if p_wdone = '1' then
+ errc_next <= errc_int - 1;
+ if errc_int <= 2 then
+ state_next <= SDONE;
+ else
+ state_next <= SERROR2;
+ end if;
+ end if;
+ when SERROR2 =>
+ if p_wdone = '0' then
+ state_next <= SERROR1;
+ end if;
+
+ when SDONE =>
+ err_next <= 0;
+ errc_next <= HSPALTE_MAX;
+ p_finished_next <= '1';
+ finished_next <= '1';
+
+ if p_wdone = '0' and do_it = '0' then
+ state_next <= SIDLE;
+ end if;
+ end case;
+
+ -- fehlerbehandlung
+ case state_int is
+ -- diese states sind ausgenommen vom "pokemon-exception-handling"
+ when SERROR1 | SERROR2 | SDONE => null;
+ when others =>
+ if calc_error = '1' then
+ if op2_int = 0 then
+ err_next <= 1;
+ else
+ err_next <= 3;
+ end if;
+ end if;
+
+ if err_int > 0 then
+ state_next <= SERROR1;
end if;
end case;
end process;
projects / hwmod.git / blobdiff