------------------------------------------------------------
-- Bisection Method (Lower FLEX10k)
-- < bisec.vhd >
-- 1999/03/15 (Mon)
-- yamaoka@tube.ee.uec.ac.jp
------------------------------------------------------------
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
use IEEE.std_logic_unsigned.all;
library metamor;
use metamor.attributes.all;
entity bisec is
port (CLK : in std_logic;
A : inout std_logic_vector(15 downto 0);
BL : in std_logic_vector(7 downto 0);
BH : out std_logic_vector(5 downto 0);
B_CONF : in std_logic_vector(1 downto 0);
CL : in std_logic_vector(5 downto 0);
DATA_BUS : inout std_logic_vector(31 downto 0);
ADRS_BUS : out std_logic_vector(16 downto 0);
CTRL_BUS : out std_logic_vector(4 downto 0);
CALC_DONE : in std_logic;
OE_ALU : out std_logic;
OBF : in std_logic_vector(1 downto 0);
ACK : out std_logic_vector(1 downto 0);
STB : out std_logic_vector(1 downto 0);
IBF : in std_logic_vector(1 downto 0)
);
attribute pinnum of CLK : signal is "D22";
attribute pinnum of A : signal is "BC23,BB24,BC25,BB26,BC27,BB28,BC29,BB30,BC31,BB32,BC33,BB34,BC35,BB36,BC37,BB38";
attribute pinnum of BL : signal is "BC13,BB14,BC15,BB16,BC17,BB18,BC19,BB20";
attribute pinnum of BH : signal is "BC7,BB8,BC9,BB10,BC11,BB12";
attribute pinnum of B_CONF : signal is "BC5,BB6";
attribute pinnum of CL : signal is "AU23,AV24,AU25,AU33,AV34,AU35";
attribute pinnum of DATA_BUS : signal is "A5,B6,A7,B8,A9,B10,A11,B12,A13,B14,A15,B16,A17,B18,A19,B20,A23,B24,A25,B26,A27,B28,A29,B30,A31,B32,A33,B34,A35,B36,A37,B38";
attribute pinnum of ADRS_BUS : signal is "F16,G19,F20,G21,F22,G23,F24,G25,F26,G29,F30,G31,F32,G33,F34,G35,F36";
attribute pinnum of CTRL_BUS : signal is "G11,F12,G13,F14,G15";
attribute pinnum of CALC_DONE : signal is "F10";
attribute pinnum of OE_ALU : signal is "G9";
attribute pinnum of OBF : signal is "AV18,AV28";
attribute pinnum of ACK : signal is "AU19,AU29";
attribute pinnum of STB : signal is "AU21,AU31";
attribute pinnum of IBF : signal is "AV20,AV30";
end bisec;
architecture RTL of bisec is
-------------<< Floating point Number Divider >>-------
component fpdiv is
port (CLK : in std_logic;
FA : in std_logic_vector(31 downto 0);
FB : in std_logic_vector(31 downto 0);
Q : out std_logic_vector(31 downto 0)
);
end component;
signal DIV_A : std_logic_vector(31 downto 0);
signal DIV_B : std_logic_vector(31 downto 0);
signal DIV_Q : std_logic_vector(31 downto 0);
signal DIV_ACK : std_logic;
signal DIV_DONE : std_logic;
signal DCNT : std_logic;
signal DCNT3 : std_logic_vector(3 downto 0);
signal A_REG : std_logic_vector(15 downto 0);
signal ACK_BUF : std_logic_vector(1 downto 0);
signal STB_BUF : std_logic_vector(1 downto 0);
signal OUT_CNT : std_logic;
signal OUT_ACK : std_logic;
signal OUT_ACK2 : std_logic;
signal N : std_logic_vector(7 downto 0);
-------------------------------
type CALC_STATE_TYPE is (
FIRST_DATA, SECOND_DATA
);
signal CALC_STATE : CALC_STATE_TYPE;
type ALU_STATE_TYPE is (
R_MEM_WR, R_MEM_RD,
L_MEM_WR, L_MEM_RD,
LR_MEM_WR,
MEM_STOP,
RR_INPRO, LL_INPRO, LR_INPRO,
INPRO_F, INPRO_R, INPRO_L, INPRO_LR,
FF_MUL, FR_MUL, FL_MUL, RR_MUL, LL_MUL, LR_MUL,
FF_ADD, FR_ADD, FL_ADD, RR_ADD, LL_ADD, LR_ADD,
CALC_F, CALC_R, CALC_L, CALC_LR,
aSTOP
);
signal ALU_STATE : ALU_STATE_TYPE;
signal DATA_BUS_BUF : std_logic_vector(31 downto 0);
signal DATA_BUF1 : std_logic_vector(31 downto 0);
signal DATA_BUF2 : std_logic_vector(31 downto 0);
signal OE_BUF : std_logic;
signal ADRS_BUF1 : std_logic_vector(16 downto 0);
signal ADRS_BUF2 : std_logic_vector(16 downto 0);
signal ALU_ACK : std_logic;
--------------------------------
type BIS_STATE_TYPE is (
BisDimRead,
BisAlphaRead, BisBetaRead, BisAlphapBetaCalc,
BisMaxCalc, BisMaxComp, BisMaxSet,
BisApBCalc, BisCCalc,
BisAlphamCCalc, BisBeta2Calc, BisBeta2dQCalc, BisQCalc, BisQComp,
BisNewRange, BisEvWrite, BisResRead,
BisStop
);
signal BIS_STATE : BIS_STATE_TYPE;
signal Alpha, Beta, OldBeta, AlphapBeta, tMax, Max, BisA, BisB, ApB, BisC, AlphamC, Beta2, Beta2dQ, Q : std_logic_vector(31 downto 0);
signal RES : std_logic_vector(31 downto 0);
constant BISEC_R : std_logic_vector(4 downto 0) := "11000"; -- 24
constant FP_ONE : std_logic_vector(31 downto 0) := "00111111100000000000000000000000";
constant FP_TWO : std_logic_vector(31 downto 0) := "01000000000000000000000000000000";
constant cR_MEM_WR : std_logic_vector(4 downto 0) := "00001";
constant cR_MEM_RD : std_logic_vector(4 downto 0) := "00010";
constant cL_MEM_WR : std_logic_vector(4 downto 0) := "00011";
constant cL_MEM_RD : std_logic_vector(4 downto 0) := "00100";
constant cLR_MEM_WR : std_logic_vector(4 downto 0) := "00101";
constant cMEM_STOP : std_logic_vector(4 downto 0) := "00110";
constant cRR_INPRO : std_logic_vector(4 downto 0) := "00111";
constant cLL_INPRO : std_logic_vector(4 downto 0) := "01000";
constant cLR_INPRO : std_logic_vector(4 downto 0) := "01001";
constant cINPRO_F : std_logic_vector(4 downto 0) := "01010";
constant cINPRO_R : std_logic_vector(4 downto 0) := "01011";
constant cINPRO_L : std_logic_vector(4 downto 0) := "01100";
constant cINPRO_LR : std_logic_vector(4 downto 0) := "01101";
constant cFF_MUL : std_logic_vector(4 downto 0) := "01110";
constant cFR_MUL : std_logic_vector(4 downto 0) := "01111";
constant cFL_MUL : std_logic_vector(4 downto 0) := "10000";
constant cRR_MUL : std_logic_vector(4 downto 0) := "10001";
constant cLL_MUL : std_logic_vector(4 downto 0) := "10010";
constant cLR_MUL : std_logic_vector(4 downto 0) := "10011";
constant cFF_ADD : std_logic_vector(4 downto 0) := "10100";
constant cFR_ADD : std_logic_vector(4 downto 0) := "10101";
constant cFL_ADD : std_logic_vector(4 downto 0) := "10110";
constant cRR_ADD : std_logic_vector(4 downto 0) := "10111";
constant cLL_ADD : std_logic_vector(4 downto 0) := "11000";
constant cLR_ADD : std_logic_vector(4 downto 0) := "11001";
constant cCALC_F : std_logic_vector(4 downto 0) := "11010";
constant cCALC_R : std_logic_vector(4 downto 0) := "11011";
constant cCALC_L : std_logic_vector(4 downto 0) := "11100";
constant cCALC_LR : std_logic_vector(4 downto 0) := "11101";
begin
A <= "ZZZZZZZZZZZZZZZZ" when ACK_BUF = "00" else A_REG;
ACK_BUF <= OBF;
ACK <= ACK_BUF;
-----------<< Output Result Data to PC >>------------
process ( BL(0), BL(3), IBF ) begin
if BL(0) = '1' then
STB <= "11";
OUT_CNT <= '0';
A_REG <= ( others => '0' );
elsif rising_edge( BL(3) ) then
STB <= "00";
if OUT_CNT = '0' then
A_REG <= RES(15 downto 0);
OUT_CNT <= '1';
else
A_REG <= RES(31 downto 16);
OUT_CNT <= '0';
end if;
end if;
if IBF = "11" then
STB <= "11";
end if;
end process;
-----------<< Generate Memory Read Signal of Result Data >>------------
process ( BL(0), BL(4), OUT_ACK2 ) begin
if BL(0) = '1' or OUT_ACK2 = '1' then
OUT_ACK <= '0';
elsif rising_edge( BL(4) ) then
OUT_ACK <= '1';
end if;
end process;
process ( BL(0), CLK ) begin
if BL(0) = '1' then
OUT_ACK2 <= '0';
elsif rising_edge( CLK ) then
if OUT_ACK = '1' then
OUT_ACK2 <= '1';
else
OUT_ACK2 <= '0';
end if;
end if;
end process;
-----<< Selecter of ALU Operation >>-----
DATA_BUS <= "ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ" when OE_BUF = '1' else DATA_BUS_BUF;
OE_ALU <= OE_BUF;
process ( BL(0), CLK ) begin
if BL(0) = '1' then
CTRL_BUS <= ( others => '0' );
elsif falling_edge( CLK ) then
case ALU_STATE is
when R_MEM_WR =>
CTRL_BUS <= cR_MEM_WR;
when R_MEM_RD =>
CTRL_BUS <= cR_MEM_RD;
when L_MEM_WR =>
CTRL_BUS <= cL_MEM_WR;
when L_MEM_RD =>
CTRL_BUS <= cL_MEM_RD;
when LR_MEM_WR =>
CTRL_BUS <= cLR_MEM_WR;
when MEM_STOP =>
CTRL_BUS <= cMEM_STOP;
when RR_INPRO =>
CTRL_BUS <= cRR_INPRO;
when LL_INPRO =>
CTRL_BUS <= cLL_INPRO;
when LR_INPRO =>
CTRL_BUS <= cLR_INPRO;
when INPRO_F =>
CTRL_BUS <= cINPRO_F;
when INPRO_R =>
CTRL_BUS <= cINPRO_R;
when INPRO_L =>
CTRL_BUS <= cINPRO_L;
when INPRO_LR =>
CTRL_BUS <= cINPRO_LR;
when FF_MUL =>
CTRL_BUS <= cFF_MUL;
when FR_MUL =>
CTRL_BUS <= cFR_MUL;
when FL_MUL =>
CTRL_BUS <= cFL_MUL;
when RR_MUL =>
CTRL_BUS <= cRR_MUL;
when LL_MUL =>
CTRL_BUS <= cLL_MUL;
when LR_MUL =>
CTRL_BUS <= cLR_MUL;
when FF_ADD =>
CTRL_BUS <= cFF_ADD;
when FR_ADD =>
CTRL_BUS <= cFR_ADD;
when FL_ADD =>
CTRL_BUS <= cFL_ADD;
when RR_ADD =>
CTRL_BUS <= cRR_ADD;
when LL_ADD =>
CTRL_BUS <= cLL_ADD;
when LR_ADD =>
CTRL_BUS <= cLR_ADD;
when CALC_F =>
CTRL_BUS <= cCALC_F;
when CALC_R =>
CTRL_BUS <= cCALC_R;
when CALC_L =>
CTRL_BUS <= cCALC_L;
when CALC_LR =>
CTRL_BUS <= cCALC_LR;
when others => null;
end case;
end if;
end process;
process ( BL(0), CLK ) begin
if BL(0) = '1' then
DATA_BUS_BUF <= ( others => '0' );
OE_BUF <= '0';
elsif falling_edge( CLK ) then
case ALU_STATE is
when R_MEM_WR | L_MEM_WR | LR_MEM_WR | FR_MUL | FL_MUL | FR_ADD | FL_ADD =>
DATA_BUS_BUF <= DATA_BUF1;
OE_BUF <= '0';
when MEM_STOP | INPRO_F | CALC_F =>
DATA_BUS_BUF <= ( others => '0' );
OE_BUF <= '1';
when LR_INPRO | INPRO_LR | LR_MUL | LR_ADD | CALC_LR =>
DATA_BUS_BUF(16 downto 0) <= ADRS_BUF2;
OE_BUF <= '0';
when FF_MUL | FF_ADD =>
OE_BUF <= '0';
if CALC_STATE = FIRST_DATA then
DATA_BUS_BUF <= DATA_BUF1;
else
DATA_BUS_BUF <= DATA_BUF2;
end if;
when others => null;
end case;
end if;
end process;
process ( BL(0), CLK ) begin
if BL(0) = '1' then
CALC_STATE <= FIRST_DATA;
elsif rising_edge( CLK ) then
case ALU_STATE is
when FF_MUL | FF_ADD =>
CALC_STATE <= SECOND_DATA;
when others =>
if CALC_DONE = '1' then
CALC_STATE <= FIRST_DATA;
end if;
end case;
end if;
end process;
process ( BL(0), CLK ) begin
if BL(0) = '1' then
ADRS_BUS <= ( others => '0' );
elsif falling_edge( CLK ) then
case ALU_STATE is
when MEM_STOP | INPRO_F | FF_MUL | FF_ADD | CALC_F =>
ADRS_BUS <= ( others => '0' );
when others =>
ADRS_BUS <= ADRS_BUF1;
end case;
end if;
end process;
------------<< Bisection Method ?>-------------
process( BL(0), CLK )
variable i, k, nPos : std_logic_vector(7 downto 0);
variable r : std_logic_vector(4 downto 0);
begin
if BL(0) = '1' then
BIS_STATE <= BisStop;
ALU_STATE <= aStop;
ALU_ACK <= '0';
DIV_ACK <= '0';
DATA_BUF1 <= (others => '0');
DATA_BUF2 <= (others => '0');
ADRS_BUF1 <= (others => '0');
ADRS_BUF2 <= (others => '0');
-- DIV_A <= (others => '0');
-- DIV_B <= (others => '0');
-- Alpha <= (others => '0');
-- Beta <= (others => '0');
-- OldBeta <= (others => '0');
-- AlphapBeta <= (others => '0');
-- tMax <= (others => '0');
Max <= (others => '0');
-- BisA <= (others => '0');
-- BisB <= (others => '0');
-- ApB <= (others => '0');
-- BisC <= (others => '0');
-- AlphamC <= (others => '0');
-- Beta2 <= (others => '0');
-- Beta2dQ <= (others => '0');
-- Q <= (others => '0');
i := ( 0 => '1', others => '0' );
k := ( 0 => '1', others => '0' );
r := ( others => '0' );
nPos := ( others => '0' );
BH <= ( others => '0' );
elsif rising_edge( CLK ) then
case BIS_STATE is
when BisStop =>
if BL(5) = '1' then
BIS_STATE <= BisDimRead;
else
ALU_STATE <= aSTOP;
BIS_STATE <= BisStop;
end if;
when BisDimRead =>
if ALU_ACK = '0' then
ALU_STATE <= L_MEM_RD;
ADRS_BUF1 <= "10000000000000000";
ALU_ACK <= '1';
else
ALU_STATE <= MEM_STOP;
end if;
if CALC_DONE = '1' then
N <= DATA_BUS(7 downto 0);
ALU_ACK <= '0';
BIS_STATE <= BisAlphaRead;
end if;
when BisAlphaRead =>
if ALU_ACK = '0' then
ALU_STATE <= R_MEM_RD;
ADRS_BUF1 <= '0' & i & i;
ALU_ACK <= '1';
else
ALU_STATE <= MEM_STOP;
end if;
if CALC_DONE = '1' then
Alpha <= DATA_BUS;
ALU_ACK <= '0';
if i < N then
BIS_STATE <= BisBetaRead;
else
BIS_STATE <= BisAlphapBetaCalc;
end if;
end if;
when BisBetaRead =>
if ALU_ACK = '0' then
ALU_STATE <= R_MEM_RD;
ADRS_BUF1 <= '0' & i & (i + '1');
ALU_ACK <= '1';
else
ALU_STATE <= MEM_STOP;
end if;
if CALC_DONE = '1' then
Beta <= DATA_BUS;
ALU_ACK <= '0';
BIS_STATE <= BisAlphapBetaCalc;
end if;
when BisAlphapBetaCalc =>
ALU_STATE <= FF_ADD;
DATA_BUF1 <= '0' & Alpha(30 downto 0);
DATA_BUF2 <= '0' & Beta(30 downto 0);
if CALC_STATE = SECOND_DATA then
ALU_STATE <= CALC_F;
end if;
if CALC_DONE = '1' then
if i = "00000001" or i = N then
tMax <= DATA_BUS;
BIS_STATE <= BisMaxComp;
else
AlphapBeta <= DATA_BUS;
BIS_STATE <= BisMaxCalc;
end if;
end if;
when BisMaxCalc =>
ALU_STATE <= FF_ADD;
DATA_BUF1 <= AlphapBeta;
DATA_BUF2 <= '0' & OldBeta(30 downto 0);
if CALC_STATE = SECOND_DATA then
ALU_STATE <= CALC_F;
end if;
if CALC_DONE = '1' then
tMax <= DATA_BUS;
BIS_STATE <= BisMaxComp;
end if;
when BisMaxComp =>
if tMax(30 downto 0) > Max(30 downto 0) then
Max <= tMax;
end if;
if i < N then
i := i + '1';
OldBeta <= Beta;
BIS_STATE <= BisAlphaRead;
else
i := ( 0 => '1', others => '0' );
BIS_STATE <= BisMaxSet;
end if;
when BisMaxSet =>
BisA <= '1' & Max(30 downto 0);
BisB <= '0' & Max(30 downto 0);
BIS_STATE <= BisApBCalc;
when BisApBCalc =>
ALU_STATE <= FF_ADD;
DATA_BUF1 <= BisA;
DATA_BUF2 <= BisB;
nPos := (others => '0');
if CALC_STATE = SECOND_DATA then
ALU_STATE <= CALC_F;
end if;
if CALC_DONE = '1' then
ApB <= DATA_BUS;
BIS_STATE <= BisCCalc;
end if;
when BisCCalc =>
if DIV_ACK = '0' then
DIV_A <= ApB;
DIV_B <= FP_TWO;
DIV_ACK <= '1';
--else
-- DIV_A <= ( others => '0' );
-- DIV_B <= ( others => '0' );
end if;
if DIV_DONE = '1' then
BisC <= DIV_Q;
DIV_ACK <= '0';
BIS_STATE <= BisAlphamCCalc;
end if;
when BisAlphamCCalc =>
if ALU_ACK = '0' then
ALU_STATE <= FR_ADD;
DATA_BUF1 <= ( not BisC(31) ) & BisC(30 downto 0);
ADRS_BUF1 <= '0' & i & i;
ALU_ACK <= '1';
else
ALU_STATE <= CALC_F;
end if;
if CALC_DONE = '1' then
ALU_ACK <= '0';
if i = "00000001" then
Q <= DATA_BUS;
BIS_STATE <= BisQComp;
else
AlphamC <= DATA_BUS;
BIS_STATE <= BisBeta2Calc;
end if;
end if;
when BisBeta2Calc =>
if ALU_ACK = '0' then
ALU_STATE <= RR_MUL;
ADRS_BUF1 <= '0' & ( i - '1' ) & i;
ALU_ACK <= '1';
else
ALU_STATE <= CALC_F;
end if;
if CALC_DONE = '1' then
Beta2 <= DATA_BUS;
ALU_ACK <= '0';
BIS_STATE <= BisBeta2dQCalc;
end if;
when BisBeta2dQCalc =>
if DIV_ACK = '0' then
DIV_A <= Beta2;
DIV_B <= Q;
DIV_ACK <= '1';
--else
-- DIV_A <= ( others => '0' );
-- DIV_B <= ( others => '0' );
end if;
if DIV_DONE = '1' then
Beta2dQ <= DIV_Q;
DIV_ACK <= '0';
BIS_STATE <= BisQCalc;
end if;
when BisQCalc =>
ALU_STATE <= FF_ADD;
DATA_BUF1 <= AlphamC;
DATA_BUF2 <= ( not Beta2dQ(31) ) & Beta2dQ(30 downto 0);
if CALC_STATE = SECOND_DATA then
ALU_STATE <= CALC_F;
end if;
if CALC_DONE = '1' then
Q <= DATA_BUS;
BIS_STATE <= BisQComp;
end if;
when BisQComp =>
if Q(31) = '0' then
nPos := nPos + '1';
end if;
if Q(30 downto 0) = "0000000000000000000000000000" then
i := i + '1';
end if;
if i < N then
i := i + '1';
BIS_STATE <= BisAlphamCCalc;
else
i := ( 0 => '1', others => '0');
BIS_STATE <= BisNewRange;
end if;
when BisNewRange =>
if nPos >= k then
BisA <= BisC;
else
BisB <= BisC;
end if;
if r < BISEC_R then
r := r + '1';
BIS_STATE <= BisApBCalc;
else
r := (others => '0');
BIS_STATE <= BisEvWrite;
end if;
when BisEvWrite =>
if ALU_ACK = '0' then
ALU_STATE <= L_MEM_WR;
DATA_BUF1 <= BisC;
ADRS_BUF1 <= "100000001" & k;
ALU_ACK <= '1';
else
ALU_STATE <= MEM_STOP;
end if;
if CALC_DONE = '1' then
ALU_ACK <= '0';
if k < N then
k := k + '1';
BisA <= '1' & Max(30 downto 0);
BisB <= BisC;
BIS_STATE <= BisApBCalc;
else
BIS_STATE <= BisResRead;
end if;
end if;
when BisResRead =>
if ALU_ACK = '0' then
ALU_STATE <= L_MEM_RD;
ADRS_BUF1 <= "100000001" & i;
ALU_ACK <= '1';
else
ALU_STATE <= MEM_STOP;
end if;
if CALC_DONE = '1' then
BH <= ( 0 => '1', others => '0' );
RES <= DATA_BUS;
end if;
if OUT_ACK2 = '1' then
BH <= ( others => '0' );
ALU_ACK <= '0';
if i < N then
i := i + '1';
else
i := ( 0 => '1', others => '0' );
end if;
end if;
when others =>
null;
end case;
end if;
end process;
process ( BL(0), CLK ) begin
if BL(0) = '1' then
DCNT <= '0';
-- DCNT3 <= "0000";
DIV_DONE <= '0';
elsif rising_edge( CLK ) then
--if DIV_ACK = '1' and DIV_DONE = '0' then
-- DCNT3 <= DCNT3 + '1';
--else
-- DCNT3 <= "0000";
--end if;
--
--if DCNT3 = "1111" then
-- DIV_DONE <= '1';
--else
-- DIV_DONE <= '0';
--end if;
if DIV_ACK = '1' and DCNT = '0' and DIV_DONE = '0' then
DCNT <= '1';
else
DCNT <= '0';
end if;
if DCNT = '1' then
DIV_DONE <= '1';
else
DIV_DONE <= '0';
end if;
end if;
end process;
------------<< Floating Point Number Divider >>--------------
divider : fpdiv port map ( CLK => CLK, FA => DIV_A, FB => DIV_B, Q => DIV_Q );
end RTL;
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