📄 bms_std_str_half.tdf
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-------------------------------------------------------------------------
-------------------------------------------------------------------------
--
-- Revision Control Information
--
-- $Workfile: bms_std_str_half.tdf $
-- $Archive: P:/RS_std/units/Dec_str/ahdl/bms_std_str_half.tdv $
--
-- $Revision: 1.2 $
-- $Date: 19 Aug 1999 16:57:54 $
-- $Author : Alejandro Diaz-Manero
--
-- Project : RS_std
--
-- Description :
--
-- Copyright 1999 (c) Altera Corporation
-- All rights reserved
--
-------------------------------------------------------------------------
-------------------------------------------------------------------------
FUNCTION lpm_add_sub (cin, dataa[LPM_WIDTH-1..0], datab[LPM_WIDTH-1..0],
add_sub, clock, aclr)
RETURNS (result[LPM_WIDTH-1..0], cout, overflow);
FUNCTION lpm_counter (data[LPM_WIDTH-1..0], clock, clk_en, cnt_en, updown, aclr,
aset, aconst, aload, sclr, sset, sconst, sload)
RETURNS (q[LPM_WIDTH-1..0], eq[15..0]);
FUNCTION lpm_compare (dataa[LPM_WIDTH-1..0], datab[LPM_WIDTH-1..0], clock, aclr)
RETURNS (alb, aeb, agb, ageb, aneb, aleb);
FUNCTION gfmul (a[m..1], b[m..1])
RETURNS (c[m..1]);
FUNCTION gfdiv (a[m..1], d[m..1])
RETURNS (c[m..1]);
PARAMETERS
(
m = 8, -- GF size (2^m)
irrpol = 285, -- field polynomial
check = 16, -- number of check symbols (= # of syndromes)
inv_file = "inv_8_285.hex"
);
constant wide = ceil(log2(check+1));
constant errs = floor(check DIV 2);
constant nummult = ceil(errs DIV 2);
constant odd = nummult > floor(errs DIV 2) ? 1:0;
subdesign bms_std_str_half
(
sysclk, reset, latchsyn, syn[check..1][m..1] : INPUT;
bdout[errs..1][m..1], omegaout[errs..1][m..1], numerr[wide..1], done : OUTPUT;
)
VARIABLE
synreg[check..1][m..1], bd[errs..1][m..1], bdprev[errs..1][m..1], bdtemp[errs..1][m..1] : dffe;
one[m..1] : node;
onereg : dffe;
onenode[m..1] : node;
deltaleft[errs..1][m..1], deltaright[errs..1][m..1] : node;
bdleft[errs..1][m..1], bdright[errs..1][m..1] : node;
mulleft[nummult..1][m..1], mulright[nummult..1][m..1], deltamult[m..1] : dffe;
mulout[nummult..1][m..1] : node;
mulsum[nummult..1][m..1], addvec[errs..1][m..1] : node;
deltazero[m..1] : node;
predelta[m..1], delta[m..1], deltaprev[m..1] : dffe;
mcount, omegacount : lpm_counter WITH (LPM_WIDTH = wide);
sub_llnum_mloop : lpm_add_sub WITH (LPM_WIDTH = wide, LPM_DIRECTION = "SUB");
add_one_llnuma : lpm_add_sub WITH (LPM_WIDTH = wide, LPM_DIRECTION = "ADD");
cmp : lpm_compare WITH (LPM_WIDTH = (wide+1));
llnuma[wide..1], zero[wide..1] : node;
llnum[wide..1] : dffe;
llnumnode[wide..1] : node;
mloop[wide..1], omegaloop[wide..1] : node;
mchk[wide..1], mcmp[wide..1], omegachk[wide..1], omegacmp[wide..1] : node;
tlm : node;
omsel[errs..1] : dffe;
omegaleft[errs..1][m..1], omegaright[errs..1][m..1] : node;
loadbdleft, loadbdright, loadbdprev, loadbdtemp : node;
multmux : node;
shiftsynleft, shiftsynright, clearbd, shiftbdprev_lm, shiftbdprev_ml : node;
deltacalc, newdelta, olddelta, load_llnum : node;
incm : node;
incomega, initomega, calcomega : node;
massdone : node;
mx : MACHINE OF BITS (mst[18..1])
WITH STATES
(s0 = B"000000000000000000",
s2 = B"000000011100000000", -- calc new delta = Sm + (series)B(j)*S(m-j), shiftBDprev_lm
s2a = B"000000011000010000", -- 1 pipe stage to top of gfmuls
s2b = B"000000011000010000", -- 1 pipe stage to top of gfmuls
s3 = B"000000000000000000", -- if new delta <> 0, calc new BD
s4 = B"000000000000001000", -- TD = BD, BD = BD - deltamult*(D^i)*BDprev
s5 = B"000000000000010001", -- load first half BD
s5a = B"000000000000010010", -- load second half BD, check 2L <= m?
s6 = B"000000100000000100", -- L = m+1-L, i=1, BDprev = BDtemp, olddelta = delta
s8 = B"000001000000100000", -- inc mloop, shift synregs left
-- calc omega
s10 = B"001100000010001000", -- initialize omegaleft, clearbd
s11 = B"001100000001010101", -- initialize omegaright, shift synregs right, loadbdprev, loadbdleft
s12 = B"001010000000000010", -- calc omegaleft, load omegaright, incomega
s13 = B"101000000001010001", -- calc omegaright, load omegaleft, synshift, shiftbdprev_ml
s14 = B"100000000000000000", -- last shiftbdprev_ml
s99 = B"010000000000000000"); -- massdone
BEGIN
mcmp[] = check;
omegacmp[] = errs-1;
one[] = 1;
zero[] = 0;
--*********************
--*** STATE MACHINE ***
--*********************
mx.clk = sysclk;
mx.reset = GND;
CASE mx IS
WHEN s0 =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s2;
END IF;
WHEN s2 =>
IF (reset == VCC) THEN
mx = s0;
ELSIF (mchk[wide] == VCC) THEN
mx = s2a;
ELSE
mx = s10;
END IF;
WHEN s2a =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s2b;
END IF;
WHEN s2b =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s3;
END IF;
WHEN s3 =>
IF (reset == VCC) THEN
mx = s0;
ELSIF (deltazero[m] == VCC) THEN
mx = s4;
ELSE
mx = s8;
END IF;
WHEN s4 =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s5;
END IF;
WHEN s5 =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s5a;
END IF;
WHEN s5a =>
IF (reset == VCC) THEN
mx = s0;
ELSIF (tlm == VCC) THEN
mx = s6;
ELSE
mx = s8;
END IF;
WHEN s6 =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s8;
END IF;
WHEN s8 =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s2;
END IF;
WHEN s10 =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s11;
END IF;
WHEN s11 =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s12;
END IF;
WHEN s12 =>
IF (reset == VCC) THEN
mx = s0;
ELSIF (omegachk[wide] == VCC) THEN
mx = s13;
ELSE
mx = s14;
END IF;
WHEN s13 =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s12;
END IF;
WHEN s14 =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s99;
END IF;
WHEN s99 =>
IF (reset == VCC) THEN
mx = s0;
ELSE
mx = s99;
END IF;
WHEN others =>
mx = s0;
END CASE;
loadbdleft = mst[1];
loadbdright = mst[2];
loadbdprev = mst[3];
loadbdtemp = mst[4];
multmux = mst[5];
shiftsynleft = mst[6];
shiftsynright = mst[7];
clearbd = mst[8];
shiftbdprev_lm = mst[9];
deltacalc = mst[10];
newdelta = mst[11];
olddelta = mst[12];
incm = mst[13];
incomega = mst[14];
initomega = mst[15];
calcomega = mst[16];
massdone = mst[17];
shiftbdprev_ml = mst[18];
load_llnum = olddelta;
--************************
--*** SYNDROME SECTION ***
--************************
-- no resets required, loaded after sm reset
synreg[1][] = (syn[1][] & !shiftsynleft) #
(synreg[2][] & shiftsynleft);
FOR k IN 2 TO errs GENERATE
synreg[k][] = (syn[k][] & !shiftsynleft & !shiftsynright) #
(synreg[k+1][] & shiftsynleft) #
(synreg[k-1][] & shiftsynright);
END GENERATE;
FOR k IN (errs+1) TO (check-1) GENERATE
synreg[k][] = (syn[k][] & !shiftsynleft) #
(synreg[k+1][] & shiftsynleft);
END GENERATE;
synreg[check][] = (syn[check][] & !shiftsynleft) # (synreg[1][] & shiftsynleft);
synreg[][].clk = sysclk;
synreg[1][].ena = latchsyn # shiftsynleft;
FOR k IN 2 TO errs GENERATE
synreg[k][].ena = latchsyn # shiftsynleft # shiftsynright;
END GENERATE;
FOR k IN (errs+1) TO check GENERATE
synreg[k][].ena = latchsyn # shiftsynleft;
END GENERATE;
--******************
--*** BD-OMEGA SECTION ***
--******************
-- load onereg with zero after first shift
-- [m..2] bits always zero, use onenode[]
onereg = latchsyn # loadbdprev;
onereg.ena = shiftbdprev_lm # latchsyn # loadbdprev;
onereg.clk = sysclk;
onenode[1] = onereg;
onenode[m..2] = 0;
FOR k IN 1 TO errs GENERATE
bd[k][] = (addvec[k][] & !clearbd & !reset);
END GENERATE;
bd[][].clk = sysclk;
FOR k IN 1 TO nummult GENERATE
bd[k][].ena = (!omsel[k] & loadbdleft) # clearbd # reset;
END GENERATE;
FOR k IN 1 TO (errs-nummult) GENERATE
bd[k+nummult][].ena = (!omsel[k+nummult] & loadbdright) # clearbd # reset;
END GENERATE;
omsel[].clk = sysclk;
omsel[].ena = incomega # reset;
omsel[1] = !reset;
FOR k IN 2 TO errs GENERATE
omsel[K] = omsel[K-1] & !reset;
end generate;
bdprev[1][] = (((bdtemp[1][] & !shiftbdprev_ml & !shiftbdprev_lm) #
(onenode[] & !shiftbdprev_ml & shiftbdprev_lm) #
(bdprev[2][] & shiftbdprev_ml & !shiftbdprev_lm)) & !reset);
IF (errs > 2) generate
FOR k IN 2 TO errs-1 GENERATE
bdprev[k][] = (((bdtemp[K][] & !shiftbdprev_ml & !shiftbdprev_lm) #
(bdprev[K-1][] & !shiftbdprev_ml & shiftbdprev_lm) #
(bdprev[K+1][] & shiftbdprev_ml & !shiftbdprev_lm)) & !reset);
END GENERATE;
end generate;
bdprev[errs][] = (((bdtemp[errs][] & !shiftbdprev_ml & !shiftbdprev_lm) #
(bdprev[errs-1][] & !shiftbdprev_ml & shiftbdprev_lm) #
(bdprev[1][] & shiftbdprev_ml & !shiftbdprev_lm)) & !reset);
bdprev[][].clk = sysclk;
bdprev[][].ena = loadbdprev # shiftbdprev_lm # shiftbdprev_ml # reset;
-- reset not needed, as initialized with bd[][]
bdtemp[][] = bd[][];
bdtemp[][].clk = sysclk;
bdtemp[][].ena = loadbdtemp;
--********************
--*** CORE SECTION ***
--********************
bdleft[][] = bdprev[][];
FOR k IN 1 to errs GENERATE
--*** calculate new delta ***
deltaleft[k][] = synreg[check+1-k][];
deltaright[k][] = bd[k][];
-- calculate new bd vector
bdright[k][] = deltamult[];
-- calculate omega
omegaleft[k][] = synreg[k][];
omegaright[k][] = (bdprev[1][] & !initomega) # (one[] & initomega);
END GENERATE;
FOR k IN 1 TO nummult-odd GENERATE
addvec[k][m..1] = bd[k][m..1] $ mulout[k][m..1]; -- GFadd
addvec[k+nummult][m..1] = bd[k+nummult][m..1] $ mulout[k][m..1]; -- GFadd
END GENERATE;
IF (odd == 1) GENERATE
addvec[nummult][m..1] = bd[nummult][m..1] $ mulout[nummult][m..1];
END GENERATE;
-- multiply
FOR k IN 1 TO nummult-odd GENERATE
mulleft[k][] = ( !multmux &
((deltaleft[k][] & deltacalc) #
(bdleft[k][] & !deltacalc & !calcomega) #
(omegaleft[k][] & !deltacalc & calcomega)) ) #
( multmux &
((deltaleft[k+nummult][] & deltacalc) #
(bdleft[k+nummult][] & !deltacalc & !calcomega) #
(omegaleft[k+nummult][] & !deltacalc & calcomega)));
mulright[k][] = ( !multmux &
((deltaright[k][] & deltacalc) #
(bdright[k][] & !deltacalc & !calcomega) #
(omegaright[k][] & !deltacalc & calcomega)) ) #
( multmux &
((deltaright[k+nummult][] & deltacalc) #
(bdright[k+nummult][] & !deltacalc & !calcomega) #
(omegaright[k+nummult][] & !deltacalc & calcomega)));
END GENERATE;
IF odd==1 GENERATE
mulleft[nummult][] = ( !multmux &
((deltaleft[nummult][] & deltacalc) #
(bdleft[nummult][] & !deltacalc & !calcomega) #
(omegaleft[nummult][] & !deltacalc & calcomega)));
mulright[nummult][] = ( !multmux &
((deltaright[nummult][] & deltacalc) #
(bdright[nummult][] & !deltacalc & !calcomega) #
(omegaright[nummult][] & !deltacalc & calcomega)));
END GENERATE;
mulleft[][].clk = sysclk;
mulright[][].clk = sysclk;
FOR k IN 1 TO nummult GENERATE
mulout[k][] = gfmul (mulleft[k][], mulright[k][])
WITH (m = m, irrpol = irrpol);
END GENERATE;
-- calculate new delta
mulsum[1][] = mulout[1][];
IF (nummult>1) GENERATE
FOR k IN 2 TO nummult GENERATE
mulsum[k][m..1] = mulout[k][m..1] $ mulsum[k-1][m..1]; -- GFadd
END GENERATE;
END GENERATE;
predelta[] = mulsum[nummult][] $ synreg[1][];
predelta[].clk = sysclk;
-- reset not needed
delta[] = mulsum[nummult][] $ predelta[];
delta[].clk = sysclk;
delta[].ena = newdelta;
deltaprev[m..2] = delta[m..2] & !reset;
deltaprev[1] = delta[1] # reset;
deltaprev[].clk = sysclk;
deltaprev[].ena = olddelta # reset;
-- reset not needed, just for timing purposes
deltamult[] = gfdiv (delta[], deltaprev[])
WITH (m=m, irrpol=irrpol, inv_file = inv_file);
deltamult[].clk = sysclk;
deltazero[1] = delta[1];
FOR k IN 2 TO m GENERATE
deltazero[k] = delta[k] # deltazero[k-1];
END GENERATE;
--****************
--*** COUNTERS ***
--****************
mloop[] = mcount.q[];
mcount.clock = sysclk;
mcount.cnt_en = incm;
mcount.sclr = reset;
mchk[1] = mloop[1] $ mcmp[1];
FOR k IN 2 TO wide GENERATE
mchk[k] = mchk[k-1] # (mloop[k] $ mcmp[k]);
END GENERATE;
-- L = M+1-L
sub_llnum_mloop.cin = VCC;
sub_llnum_mloop.dataa[] = mloop[];
sub_llnum_mloop.datab[] = llnum[];
llnuma[] = sub_llnum_mloop.result[];
add_one_llnuma.cin = VCC;
add_one_llnuma.dataa[] = llnuma[];
add_one_llnuma.datab[] = zero[];
llnumnode[] = add_one_llnuma.result[];
-- (llnuma[],,) = lpm_add_sub ( VCC, mloop[], llnum[],,,)
-- WITH (LPM_WIDTH = wide, LPM_DIRECTION = "SUB");
-- (llnumnode[],,) = lpm_add_sub ( VCC, llnuma[], zero[],,,)
-- WITH (LPM_WIDTH = wide);
llnum[] = llnumnode[] & !reset;
llnum[].clk = sysclk;
llnum[].ena = load_llnum # reset;
-- 2L <= m?
-- (,,,,,tlm) = lpm_compare ( (llnum[],0), (0,mloop[]),,)
-- WITH (LPM_WIDTH = (wide+1));
cmp.dataa[] = (llnum[],0);
cmp.datab[] = (0,mloop[]);
tlm = cmp.aleb;
omegaloop[] = omegacount.q[];
omegacount.clock = sysclk;
omegacount.cnt_en = incomega;
omegacount.sclr = reset;
omegachk[1] = omegaloop[1] $ omegacmp[1];
FOR k IN 2 TO wide GENERATE
omegachk[k] = omegachk[k-1] # (omegaloop[k] $ omegacmp[k]);
END GENERATE;
--***************
--*** OUTPUTS ***
--***************
bdout[][] = bdprev[][];
omegaout[][] = bd[][];
numerr[] = llnum[];
done = massdone;
END;
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