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;
- calc_error : in std_logic;
-- Scanner
do_it : in std_logic;
finished : out std_logic
type PARSER_STATE is (SIDLE, SREAD_NEWNUMBER, SREAD_SPACE1_2,
SREAD_SPACE1_3, SREAD_SPACE2, SREAD_SPACE3, SREAD_OP1, SREAD_OP2,
SREAD_SIGN1, SREAD_NEXTBYTE, SREAD_CALCNUMBER1, SREAD_CALCNUMBER2, SCALC_1,
- SCALC_14, SCALC_15, SCALC_2, SWRITE_CHAR1, SWRITE_CHAR2, SWRITE_SIGN1,
- SWRITE_SIGN2, SDONE, SERROR1, SERROR2);
+ SCALC_14, SCALC_15, SCALC_2, SWRITE_CHAR0, SWRITE_CHAR1, SWRITE_CHAR2,
+ SWRITE_SIGN1, SWRITE_SIGN2, SDONE, SERROR1, SERROR2);
signal state_int, state_next : PARSER_STATE;
signal z_int, z_next, strich_int, strich_next, wtmp_int, wtmp_next : csigned;
signal punkt_int, punkt_next : csigned;
signal do_calc_int, do_calc_next : std_logic;
signal goto_calcn1, goto_op1, goto_space3, goto_sign : 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;
+ signal errc_tmp_next, errc_tmp_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 : entity work.alu(beh)
+ 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;
rbyte_int <= (others => '0');
aktop_int <= ALU_NOP;
opp_int <= ALU_NOP;
+ err_int <= 0;
+ errc_int <= 71;
+ errc_tmp_int <= 0;
+ firstz_int <= true;
-- out ports
p_rw <= '0';
p_spalte <= (others => '0');
rbyte_int <= rbyte_next;
aktop_int <= aktop_next;
opp_int <= opp_next;
+ err_int <= err_next;
+ errc_int <= errc_next;
+ errc_tmp_int <= errc_tmp_next;
+ firstz_int <= firstz_next;
-- out ports
p_rget_int <= p_rget_next;
p_write_int <= p_write_next;
-- next state
process(state_int, do_it, p_rdone, p_wdone, p_read, aktop_int, strich_int,
punkt_int, calc_done, wtmp_int, opp_int, goto_calcn1, goto_op1,
- goto_space3, goto_sign, z_sign_int)
+ goto_space3, goto_sign, z_sign_int, err_int, errc_int, calc_error,
+ op2_int)
begin
state_next <= state_int;
state_next <= SREAD_OP1;
elsif goto_space3 = '1' then
state_next <= SREAD_SPACE3;
- else
+ elsif calc_done = '1' then
state_next <= SREAD_CALCNUMBER2;
end if;
when SREAD_OP1 =>
end if;
end if;
when SREAD_CALCNUMBER2 =>
- if p_rdone = '0' then
+ if p_rdone = '0' and calc_done = '0' then
state_next <= SREAD_NEXTBYTE;
end if;
when SCALC_1 =>
state_next <= SCALC_2;
end if;
when SCALC_2 =>
- if aktop_int = ALU_DONE then
+ 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 =>
+ if calc_done = '1' then
state_next <= SWRITE_CHAR1;
- else
- state_next <= SREAD_NEWNUMBER;
end if;
when SWRITE_CHAR1 =>
if p_wdone = '1' then
end if;
when SERROR1 =>
if p_wdone = '1' then
- -- TODO
- if strich_int < 10 then
+ if errc_int <= 2 then
state_next <= SDONE;
else
- state_next <= SWRITE_CHAR2;
+ state_next <= SERROR2;
end if;
end if;
- when SWRITE_CHAR2 | SERROR2 =>
+ when SERROR2 =>
if p_wdone = '0' then
- state_next <= SWRITE_CHAR1;
+ state_next <= SERROR1;
+ end if;
+ when SWRITE_CHAR2 =>
+ 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 <= SIDLE;
end if;
end case;
+
+ -- fehlerbehandlung
+ case state_int is
+ when SERROR1 | SERROR2 | SDONE => null;
+ when others =>
+ if err_int > 0 then
+ state_next <= SERROR1;
+ end if;
+ end case;
end process;
-- out
process(state_int, p_read, p_write_int, z_int, rbyte_int, p_rget_int,
- strich_int, aktop_int, opp_int, opcode_int, op1_int, op2_int, op3,
- do_calc_int, wtmp_int, punkt_int, z_sign_int)
+ strich_int, aktop_int, opp_int, opcode_int, op1_int, op2_int, op3, opM,
+ do_calc_int, wtmp_int, punkt_int, z_sign_int, err_int, errc_int,
+ errc_tmp_int, firstz_int, calc_done, calc_error)
function hbyte2csigned (x : hbyte) return csigned is
variable y : csigned;
begin
case x is
- when x"30" => y := to_signed(0, CBITS);
- when x"31" => y := to_signed(1, CBITS);
- when x"32" => y := to_signed(2, CBITS);
- when x"33" => y := to_signed(3, CBITS);
- when x"34" => y := to_signed(4, CBITS);
- when x"35" => y := to_signed(5, CBITS);
- when x"36" => y := to_signed(6, CBITS);
- when x"37" => y := to_signed(7, CBITS);
- when x"38" => y := to_signed(8, CBITS);
- when x"39" => y := to_signed(9, CBITS);
+ 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;
return y;
end function csigned2hbyte;
+
variable multmp : signed(((2*CBITS)-1) downto 0);
variable tmp : csigned;
+
+ type errstrings is array (natural range 1 to 3) of hstring;
+ constant error_str : errstrings := (
+ 1 => " Division durch Null" & nul,
+ 2 => " Syntax" & nul,
+ 3 => " Over- bzw. Underflow" & nul
+ );
begin
-- internal
z_next <= z_int;
rbyte_next <= rbyte_int;
aktop_next <= aktop_int;
opp_next <= opp_int;
+ err_next <= err_int;
+ errc_next <= errc_int;
+ errc_tmp_next <= errc_tmp_int;
+ firstz_next <= firstz_int;
-- signals
p_rget_next <= '0';
p_write_next <= p_write_int;
when SREAD_NEWNUMBER =>
z_next <= (others => '0');
z_sign_next <= '0';
+ firstz_next <= true;
rbyte_next <= (others => '0');
p_write_next <= (others => '0');
aktop_next <= ALU_NOP;
case p_read is
-- '+', '-', '*', '/'
when x"2B" | x"2D" | x"2A" | x"2F" | x"00" =>
- goto_op1 <= '1';
- p_rget_next <= '1';
+ if firstz_int then
+ err_next <= 2;
+ else
+ goto_op1 <= '1';
+ p_rget_next <= '1';
+ end if;
-- ' '
when x"20" =>
p_rget_next <= '1';
when others =>
- -- TODO: check auf overflow
- multmp := (z_int * 10) + hbyte2csigned(p_read);
- z_next <= multmp((CBITS-1) downto 0);
+ op1_next <= z_int;
+ opcode_next <= ALU_MUL;
+ op2_next <= to_signed(10,CBITS);
+ firstz_next <= false;
+ do_calc_next <= '1';
end case;
when SREAD_SIGN1 =>
z_sign_next <= '1';
- when SREAD_CALCNUMBER2 | SREAD_OP2 =>
+ when SREAD_CALCNUMBER2 =>
+ z_next <= op3 + hbyte2csigned(p_read);
+ when SREAD_OP2 =>
null;
when SREAD_OP1 =>
case p_read is
- -- '+'
- when x"2B" =>
- aktop_next <= ALU_ADD;
- -- '-'
- when x"2D" =>
- -- TODO: sign check beim ersten byte lesen!
- aktop_next <= ALU_SUB;
- -- '*'
- when x"2A" =>
- aktop_next <= ALU_MUL;
- -- '/'
- when x"2F" =>
- aktop_next <= ALU_DIV;
+ 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'
- -- '\0'
- when x"00" =>
- aktop_next <= ALU_DONE;
-
- -- TODO: err!
- when others => assert(false) report "TODO: ...";
+ when others => err_next <= 2;
end case;
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;
-- aktuelle rechenoperation fuer naechste 'runde' uebernehmen
opp_next <= aktop_int;
+ when SWRITE_CHAR0 =>
+ op1_next <= strich_int;
+ opcode_next <= ALU_DIV;
+ op2_next <= to_signed(10,CBITS);
+ do_calc_next <= '1';
when SWRITE_CHAR1 =>
+ do_calc_next <= '1';
p_wtake_next <= '1';
- tmp := strich_int mod 10;
+ tmp := opM;
p_write_next <= csigned2hbyte(tmp);
- wtmp_next <= strich_int / 10;
+ wtmp_next <= op3;
when SWRITE_CHAR2 =>
strich_next <= wtmp_int;
end if;
when SERROR1 =>
- -- TODO
- null;
+ p_wtake_next <= '1';
+ p_write_next <= hbyte(to_unsigned (character'pos(error_str(err_int)(errc_int)),8));
+ errc_tmp_next <= errc_int - 1;
when SERROR2 =>
- -- TODO
- null;
+ errc_next <= errc_tmp_int;
when SDONE =>
+ err_next <= 0;
+ errc_next <= 71;
p_finished_next <= '1';
end case;
+
+ -- fehlerbehandlung
+ case state_int is
+ 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;
+ end case;
end process;
end architecture beh;
projects / hwmod.git / blobdiff