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- input data rate can be lower than filter

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git-svn-id: http://moon:8086/svn/vhdl/trunk@198 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-01-04 15:16:06 +00:00
parent fe60d9d7a4
commit f05c6bb829
4 changed files with 70 additions and 59 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/filter/sim/tb_fir_semi_parallel.fdo
+1 -1
View File
@@ -16,4 +16,4 @@ do {tb_fir_semi_parallel.wdo}
view wave
view structure
view signals
run 400us
run 120us
lib/filter/sim/tb_fir_semi_parallel.wdo
+7 -4
View File
@@ -5,7 +5,6 @@ add wave -noupdate -format Logic /tb_fir_semi_parallel/uut/clk
add wave -noupdate -format Literal /tb_fir_semi_parallel/uut/h_addr
add wave -noupdate -format Logic /tb_fir_semi_parallel/uut/h_we
add wave -noupdate -format Literal -radix decimal /tb_fir_semi_parallel/uut/h_in
add wave -noupdate -format Logic /tb_fir_semi_parallel/din_vld
add wave -noupdate -format Logic /tb_fir_semi_parallel/dout_vld
add wave -noupdate -format Literal -radix decimal /tb_fir_semi_parallel/d_in
add wave -noupdate -format Literal -radix decimal /tb_fir_semi_parallel/d_out
@@ -14,7 +13,11 @@ add wave -noupdate -divider {Real out}
add wave -noupdate -format Analog-Step -height 50 -scale 50.0 /tb_fir_semi_parallel/xi
add wave -noupdate -format Analog-Step -height 50 -scale 50.0 /tb_fir_semi_parallel/yo
add wave -noupdate -divider -height 50 <NULL>
add wave -noupdate -format Literal /tb_fir_semi_parallel/uut/count_array
add wave -noupdate -format Logic /tb_fir_semi_parallel/uut/en
add wave -noupdate -format Logic /tb_fir_semi_parallel/uut/ce0
add wave -noupdate -format Literal /tb_fir_semi_parallel/uut/count0
add wave -noupdate -format Logic /tb_fir_semi_parallel/din_vld
add wave -noupdate -format Literal -expand /tb_fir_semi_parallel/uut/count_array
add wave -noupdate -format Literal -radix decimal /tb_fir_semi_parallel/uut/coef_array
add wave -noupdate -format Literal -expand /tb_fir_semi_parallel/uut/ce_array
add wave -noupdate -format Literal /tb_fir_semi_parallel/uut/h_addr
@@ -40,7 +43,7 @@ add wave -noupdate -format Literal -radix decimal /tb_fir_semi_parallel/uut/gen_
add wave -noupdate -format Literal -radix decimal /tb_fir_semi_parallel/uut/gen_stages__1/inst_fir_stage/x_out
add wave -noupdate -format Literal -radix decimal /tb_fir_semi_parallel/uut/gen_stages__1/inst_fir_stage/y_out
TreeUpdate [SetDefaultTree]
WaveRestoreCursors {{Cursor 1} {256495124 ps} 0}
WaveRestoreCursors {{Cursor 1} {345579170 ps} 0} {{Cursor 2} {119566178 ps} 0} {{Cursor 3} {62144258 ps} 0}
configure wave -namecolwidth 150
configure wave -valuecolwidth 100
configure wave -justifyvalue left
@@ -54,4 +57,4 @@ configure wave -gridperiod 100
configure wave -griddelta 40
configure wave -timeline 1
update
WaveRestoreZoom {0 ps} {420 us}
WaveRestoreZoom {0 ps} {126 us}
lib/filter/src/fir_semi_parallel.vhd
+36 -44
View File
@@ -52,7 +52,6 @@ Port
(
rst : in std_logic;
clk : in std_logic;
ce : in std_logic;
h_addr : in natural range 0 to nstages*ntaps_per_stage-1;
h_we : in std_logic;
h_in : in sfixed;
@@ -77,7 +76,7 @@ architecture Behavioral of fir_semi_parallel is
type coef_stage_array_t is array (0 to ntaps_per_stage-1) of coef_t;
type coef_array_t is array (0 to nstages-1) of coef_stage_array_t;
subtype count_t is natural range 0 to ntaps_per_stage-1;
type count_array_t is array (0 to nstages-1) of count_t;
type count_array_t is array (nstages-1 downto 0) of count_t;
subtype stage_t is sfixed(shi(nbits_stages, nbits_stages_frac) downto slo(nbits_stages, nbits_stages_frac));
type stage_array_t is array (0 to nstages) of stage_t;
@@ -87,7 +86,7 @@ architecture Behavioral of fir_semi_parallel is
signal coef_stage : coef_stage_t;
signal count0 : count_t;
signal ce0 : std_logic;
signal ce_array : unsigned(0 to nstages);
signal ce_array : unsigned(nstages downto 0);
signal coef_addr : unsigned(coef_addr_nbits-1 downto 0);
signal stage_addr : unsigned(NextExpBaseTwo(nstages)-1 downto 0);
@@ -95,11 +94,13 @@ architecture Behavioral of fir_semi_parallel is
SIGNAL xo : stage_array_t;
SIGNAL y : stage_array_t;
SIGNAL accu : sfixed(shi(nbits_stages, nbits_stages_frac) downto slo(nbits_stages, nbits_stages_frac));
signal accu_load : std_logic;
signal en : std_logic;
signal accu_load : std_logic;
signal accu_ld_pipe : unsigned(input_latency+coef_latency+pipe_latency downto 0);
signal vld_pipe : unsigned(1 downto 0);
signal din_r : sfixed(shi(nbits_in, nbits_in_frac) downto slo(nbits_in, nbits_in_frac));
-------------------------------------------------------------------------------
begin
@@ -108,21 +109,18 @@ begin
coef_addr <= to_unsigned(h_addr, coef_addr_nbits);
stage_addr <= coef_addr(coef_addr'left downto NextExpBaseTwo(ntaps_per_stage));
x(0) <= resize(din, x(0));
x(0) <= resize(din_r, x(0));
y(0) <= to_sfixed(0.0, y(0));
accu_load <= accu_ld_pipe(accu_ld_pipe'left);
dout_vld <= vld_pipe(vld_pipe'left) and ce0;
rdy <= ce0;
rdy <= '1';
valid_pipe:
din_register:
process(clk)
begin
if rising_edge(clk) then
if rst = '1' then
vld_pipe <= (others => '0');
elsif ce0 = '1' then
vld_pipe <= vld_pipe(vld_pipe'left-1 downto 0) & din_vld;
if din_vld = '1' then
din_r <= din;
end if;
end if;
end process;
@@ -131,14 +129,11 @@ accu_load_pipe:
process(clk)
begin
if rising_edge(clk) then
accu_ld_pipe(0) <= ce_array(nstages-1);
for i in 1 to accu_ld_pipe'length-1 loop
if rst = '1' then
accu_ld_pipe(i) <= '0';
else
accu_ld_pipe(i) <= accu_ld_pipe(i-1);
end if;
end loop;
if rst = '1' then
accu_ld_pipe <= (others => '0');
elsif en = '1' then
accu_ld_pipe <= accu_ld_pipe(accu_ld_pipe'left-1 downto 0) & ce_array(nstages-1);
end if;
end if;
end process;
@@ -162,7 +157,7 @@ coef_read:
variable i : natural range 0 to nstages-1;
begin
if rising_edge(clk) then
if rising_edge(clk) and en = '1' then
for i in 0 to nstages-1 loop
coef_stage(i) <= coef_array(i)(count_array(i));
end loop;
@@ -177,11 +172,14 @@ counter:
ce0 <= '0';
count0 <= cnt;
if rst = '1' then
cnt := 0;
en <= '0';
cnt := count_t'high;
elsif cnt /= count_t'high then
cnt := cnt + 1;
else
if cnt /= count_t'high then
cnt := cnt + 1;
else
en <= '0';
if din_vld = '1' then
en <= '1';
cnt := 0;
ce0 <= '1';
end if;
@@ -192,13 +190,8 @@ counter:
cnt_pipe:
process(clk)
begin
if rising_edge(clk) then
count_array(0) <= count0;
for i in 1 to nstages-1 loop
if rst = '0' then
count_array(i) <= count_array(i-1);
end if;
end loop;
if rising_edge(clk) and en = '1' then
count_array <= count_array(count_array'left-1 downto 0) & count0;
end if;
end process;
@@ -206,14 +199,11 @@ ce_pipe:
process(clk)
begin
if rising_edge(clk) then
ce_array(0) <= ce0;
for i in 1 to nstages loop
if rst = '1' then
ce_array(i) <= '0';
else
ce_array(i) <= ce_array(i-1);
end if;
end loop;
if rst = '1' then
ce_array <= (others => '0');
elsif en = '1' then
ce_array <= ce_array(ce_array'left-1 downto 0) & ce0;
end if;
end if;
end process;
@@ -235,7 +225,7 @@ gen_stages:
(
rst => rst,
clk => clk,
ce => ce,
ce => en,
x_in => x(i+1),
y_in => y(i),
h_in => coef_stage(i),
@@ -259,7 +249,8 @@ gen_delays:
PORT MAP
(
clk => clk,
ce => ce_array(i),
ce => en,
shift_en => ce_array(i),
delay => count_array(i),
din => x(i),
dout => x(i+1)
@@ -269,7 +260,8 @@ gen_delays:
acumulator:
process(clk)
begin
if rising_edge(clk) then
if rising_edge(clk) and en = '1' then
dout_vld <= accu_load;
if accu_load = '1' then
dout <= resize(accu, shi(nbits_out, nbits_out_frac), slo(nbits_out, nbits_out_frac));
end if;
lib/filter/src/tb_fir_semi_parallel.vhd
+26 -10
View File
@@ -31,8 +31,8 @@ use work.PCK_FIO.all;
ENTITY tb_fir_semi_parallel IS
Generic
(
ntaps_per_stage : integer := 16;
nstages : integer := 2;
ntaps_per_stage : integer := 4;
nstages : integer := 8;
nbits_in : integer := 32;
nbits_in_frac : integer := 30;
nbits_stages : integer := 32;
@@ -114,7 +114,6 @@ BEGIN
(
rst => rst,
clk => clk,
ce => '1',
h_addr => h_addr,
h_we => h_we,
h_in => h_in,
@@ -157,6 +156,10 @@ BEGIN
h_we <= '1';
end loop;
wait until rising_edge(clk);
h_addr <= 0;
h_in <= to_sfixed(0.25, h_in);
h_we <= '1';
wait until rising_edge(clk);
h_we <= '0';
d_in <= to_sfixed(0.0, d_in);
@@ -176,17 +179,30 @@ BEGIN
wait until rising_edge(clk) and rdy = '1';
din_vld <= '0';
wait for 64*ntaps*PERIOD;
wait for 64*ntaps*PERIOD;
wait until rising_edge(clk) and rdy = '1';
din_vld <= '1';
d_in <= to_sfixed(1.0, d_in);
wait until rising_edge(clk);
din_vld <= '0';
wait for 10*PERIOD;
wait until rising_edge(clk) and rdy = '1';
din_vld <= '1';
d_in <= to_sfixed(0.0, d_in);
wait until rising_edge(clk) and rdy = '1';
d_in <= to_sfixed(1.0, d_in);
wait until rising_edge(clk) and rdy = '1';
d_in <= to_sfixed(0.0, d_in);
wait for 64*ntaps*PERIOD;
wait until rising_edge(clk) and rdy = '1';
wait until rising_edge(clk);
din_vld <= '0';
for i in 0 to 9999 loop
wait for 2*PERIOD;
wait until rising_edge(clk) and rdy = '1';
din_vld <= '1';
d_in <= to_sfixed(0.0, d_in);
wait until rising_edge(clk);
din_vld <= '0';
end loop;
wait for 40*PERIOD;