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- coef input registered

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git-svn-id: http://moon:8086/svn/vhdl/trunk@213 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-01-08 10:25:45 +00:00
parent 83a9b4c417
commit 5f40d70789
1 changed files with 12 additions and 11 deletions
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lib/filter/src/fir_semi_parallel.vhd
+12 -11
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@@ -83,7 +83,6 @@ architecture Behavioral of fir_semi_parallel is
signal ce0 : std_logic; signal ce0 : std_logic;
signal ce_array : unsigned(nstages downto 0); signal ce_array : unsigned(nstages downto 0);
signal coef_addr : unsigned(coef_addr_nbits-1 downto 0); signal coef_addr : unsigned(coef_addr_nbits-1 downto 0);
signal stage_addr : unsigned(NextExpBaseTwo(nstages)-1 downto 0);
SIGNAL x : stage_array_t; SIGNAL x : stage_array_t;
SIGNAL xo : stage_array_t; SIGNAL xo : stage_array_t;
@@ -107,16 +106,11 @@ begin
assert ntaps_per_stage = NextPowerOfTwo(ntaps_per_stage) report "ntaps_per_stage must be of form 2**R!" severity failure; assert ntaps_per_stage = NextPowerOfTwo(ntaps_per_stage) report "ntaps_per_stage must be of form 2**R!" severity failure;
assert ntaps_per_stage >= 4 report "ntaps_per_stage must be greater than 4" severity failure; assert ntaps_per_stage >= 4 report "ntaps_per_stage must be greater than 4" severity failure;
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_r, x(0)); x(0) <= resize(din_r, x(0));
y(0) <= to_sfixed(0.0, y(0)); y(0) <= to_sfixed(0.0, y(0));
accu_load <= accu_ld_pipe(accu_ld_pipe'left); accu_load <= accu_ld_pipe(accu_ld_pipe'left);
coef_din <= unsigned(h_in);
din_register: din_register:
process(clk) process(clk)
begin begin
@@ -140,13 +134,20 @@ accu_load_pipe:
end process; end process;
coef_we_gen: coef_we_gen:
process(stage_addr) process(clk)
variable i : natural range 0 to nstages-1; variable i : natural range 0 to nstages-1;
variable caddr : unsigned(coef_addr_nbits-1 downto 0);
variable saddr : unsigned(NextExpBaseTwo(nstages)-1 downto 0);
begin begin
i := to_integer(stage_addr); if rising_edge(clk) then
coef_we <= (others => '0'); caddr := to_unsigned(h_addr, coef_addr_nbits);
coef_we(i) <= '1'; saddr := caddr(caddr'left downto NextExpBaseTwo(ntaps_per_stage));
i := to_integer(saddr);
coef_we <= (others => '0');
coef_we(i) <= '1';
coef_din <= unsigned(h_in);
coef_addr <= caddr;
end if;
end process; end process;
counter: counter: