Transcript DPS sa FPGA Direktna implementacija FIR filtara Direktni FIR filtar b[L–1] b[L–2] p[L–1] p[L–2] SOP: PROCESS (a,p) BEGIN FOR I IN 0 TO L-2 LOOP -- Compute the transposed a(I) END.

DPS sa FPGA
Direktna implementacija FIR filtara
Direktni FIR filtar
b[L–1]
b[L–2]
p[L–1]
p[L–2]
SOP: PROCESS (a,p)
BEGIN
FOR I IN 0 TO L-2 LOOP
-- Compute the transposed
a(I) <= (p(I)(W2-1) & p(I)) + a(I+1); -- filter adds
END LOOP;
a(L-1) <= p(L-1)(W2-1) & p(L-1); -- First TAP has
y <= a(0);
END PROCESS SOP;
b[L–3]
b[0]
p[L–3]
p[0]
Load: PROCESS
BEGIN
WAIT UNTIL clk = '1';
IF (Load_x = '0') THEN
c(L-1) <= c_in;
-- ucitavanje koeficijenta
FOR I IN L-2 DOWNTO 0 LOOP -- pomeranje koeficijenata
c(I) <= c(I+1);
END LOOP;
ELSE
MulGen: FOR I IN 0 TO L-1 GENERATE
b(L-1) <= x_in;
-- Muls:
ucitavanje
ulaza
lpm_mult
-- p(i) = c(L-1-i) * b(i);
FOR I IN L-2 DOWNTO GENERIC
0 LOOP --MAP
pomeranje
ulaza
( LPM_WIDTHA
=> W1, LPM_WIDTHB => W1,
b(I) <= b(I+1);
LPM_PIPELINE => Mpipe,
END LOOP;
LPM_REPRESENTATION => "SIGNED",
END IF;
LPM_WIDTHP => W2,
END PROCESS Load;
LPM_WIDTHS => W2)
a[L–2]
a[L–3]
PORT MAP ( clock => clk,
dataa => b(I),
datab => c(L-1-I), result => p(I));
END GENERATE;
a[0]
Zauzetost komponente
• LE:
163
• MULT: 4
• 216.73MHz
PROCESS
MulGen: FOR I IN 0Load:
TO L-1
GENERATE
BEGIN
Muls: lpm_mult
-- Multiply p(i) = c(i) * x;
UNTIL clk =>
= '1';
GENERIC MAP (WAIT
LPM_WIDTHA
W1, LPM_WIDTHB => W1,
IF
(Load_x
=
'0')
THEN
LPM_PIPELINE => Mpipe,
f(L-1) <= f_in;
--=>preuzimanje
LPM_REPRESENTATION
"SIGNED", koeficijenta
FOR
I
IN
L-2
DOWNTO
0 LOOP -- shiftovanje keoficijenata
LPM_WIDTHP => W2,
f(I) <==>f(I+1);
LPM_WIDTHS
W2)
END
LOOP;
PORT MAP ( clock => clk,
ELSE
dataa => x,
x <=
x_in;=> p(I));-- sample
datab => f(I),
result
END
IF;
END GENERATE;
END PROCESSSOP:
Load;PROCESS (clk)
BEGIN
IF clk'event and (clk = '1') THEN
FOR I IN 0 TO L-2 LOOP
a(I) <= (p(I)(W2-1) & p(I)) + a(I+1);
END LOOP;
a(L-1) <= p(L-1)(W2-1) & p(L-1);
END IF;
y <= a(0);
END PROCESS SOP;
Transponovani FIR filtar
p[L–1]
a[L–1]
p[L–2]
p[L–3]
a[L–2]
a[L–3]
p[0]
a[0]
Zauzetost komponente
• LE:
184
• MULT: 4
• 216.73MHz