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Lab 3: Audio Processing System #3

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PickleRick merged 43 commits from LAB3 into main 2025-06-07 22:18:48 +02:00
Conversation 1 Commits 43 Files Changed 45 +181 -81
5 changed files with 181 additions and 81 deletions
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26
LAB3/sim/tb_volume_multiplier.vhd
View File

@@ -14,6 +14,7 @@ ARCHITECTURE Behavioral OF tb_volume_multiplier IS
CONSTANT VOLUME_WIDTH : POSITIVE := 10; CONSTANT VOLUME_WIDTH : POSITIVE := 10;
CONSTANT VOLUME_STEP_2 : POSITIVE := 6; CONSTANT VOLUME_STEP_2 : POSITIVE := 6;
CONSTANT N_SAMPLES : INTEGER := 8; CONSTANT N_SAMPLES : INTEGER := 8;
CONSTANT N_VOLUMES : INTEGER := 10;
-- Output width calculation (as in DUT) -- Output width calculation (as in DUT)
CONSTANT TDATA_OUT_WIDTH : INTEGER := TDATA_WIDTH - 1 + 2 ** (VOLUME_WIDTH - VOLUME_STEP_2 - 1) + 1; CONSTANT TDATA_OUT_WIDTH : INTEGER := TDATA_WIDTH - 1 + 2 ** (VOLUME_WIDTH - VOLUME_STEP_2 - 1) + 1;
@@ -64,6 +65,21 @@ ARCHITECTURE Behavioral OF tb_volume_multiplier IS
x"FFF600" -- -2560 x"FFF600" -- -2560
); );
-- Vettore di memoria per i valori di volume
TYPE volume_mem_type IS ARRAY(0 TO N_VOLUMES-1) OF STD_LOGIC_VECTOR(VOLUME_WIDTH-1 DOWNTO 0);
SIGNAL volume_mem : volume_mem_type := (
std_logic_vector(to_unsigned(0, VOLUME_WIDTH)), -- 0.25x (forte attenuazione)
std_logic_vector(to_unsigned(64, VOLUME_WIDTH)), -- 0.375x (attenuazione media)
std_logic_vector(to_unsigned(479, VOLUME_WIDTH)), -- 0.4375x (leggera attenuazione)
std_logic_vector(to_unsigned(480, VOLUME_WIDTH)), -- 0.5x (volume neutro)
std_logic_vector(to_unsigned(513, VOLUME_WIDTH)), -- Circa 0.5x (volume neutro)
std_logic_vector(to_unsigned(576, VOLUME_WIDTH)), -- 0.5625x (leggero aumento)
std_logic_vector(to_unsigned(640, VOLUME_WIDTH)), -- 0.625x (aumento medio)
std_logic_vector(to_unsigned(768, VOLUME_WIDTH)), -- 0.75x (aumento forte)
std_logic_vector(to_unsigned(896, VOLUME_WIDTH)), -- 0.875x (aumento molto forte)
std_logic_vector(to_unsigned(1023, VOLUME_WIDTH)) -- 1x (massimo volume)
);
BEGIN BEGIN
-- Clock generation -- Clock generation
@@ -99,7 +115,7 @@ BEGIN
WAIT UNTIL rising_edge(aclk); WAIT UNTIL rising_edge(aclk);
-- Set volume to mid (no gain/loss) -- Set volume to mid (no gain/loss)
volume <= std_logic_vector(to_unsigned(511, VOLUME_WIDTH)); volume <= volume_mem(0);
WAIT UNTIL rising_edge(aclk); WAIT UNTIL rising_edge(aclk);
-- Send all samples -- Send all samples
@@ -122,7 +138,7 @@ BEGIN
-- Change volume (attenuate) -- Change volume (attenuate)
WAIT FOR 20 ns; WAIT FOR 20 ns;
volume <= std_logic_vector(to_unsigned(256, VOLUME_WIDTH)); -- attenuate volume <= volume_mem(1);
-- Send one more sample -- Send one more sample
WAIT UNTIL rising_edge(aclk); WAIT UNTIL rising_edge(aclk);
@@ -136,6 +152,12 @@ BEGIN
s_axis_tvalid <= '0'; s_axis_tvalid <= '0';
s_axis_tlast <= '0'; s_axis_tlast <= '0';
FOR i IN 2 TO N_VOLUMES-1 LOOP
WAIT FOR 20 ns;
volume <= volume_mem(i);
WAIT UNTIL rising_edge(aclk);
END LOOP;
-- Wait and finish -- Wait and finish
WAIT FOR 100 ns; WAIT FOR 100 ns;
WAIT; WAIT;

148
LAB3/src/balance_controller.vhd
View File

@@ -28,61 +28,127 @@ END balance_controller;
ARCHITECTURE Behavioral OF balance_controller IS ARCHITECTURE Behavioral OF balance_controller IS
CONSTANT BAL_MID : INTEGER := 2 ** (BALANCE_WIDTH - 1); -- 512 per 10 bit CONSTANT CENTER_VALUE : INTEGER := 2 ** (BALANCE_WIDTH - 1) - 1; -- 511 per BALANCE_WIDTH=10
CONSTANT DEAD_ZONE : INTEGER := 32; CONSTANT DEADZONE : INTEGER := 32; -- Deadzone da -32 a +32
CONSTANT BLOCK_SIZE : INTEGER := 64; CONSTANT MAX_SHIFT : INTEGER := TDATA_WIDTH - 1; -- Massimo shift possibile
SIGNAL tvalid_reg : STD_LOGIC := '0'; SIGNAL balance_signed : signed(BALANCE_WIDTH - 1 DOWNTO 0);
SIGNAL tdata_reg : STD_LOGIC_VECTOR(TDATA_WIDTH - 1 DOWNTO 0) := (OTHERS => '0'); SIGNAL shift_amount_left, shift_amount_right : NATURAL RANGE 0 TO MAX_SHIFT;
SIGNAL tlast_reg : STD_LOGIC := '0';
SIGNAL left_shift : INTEGER RANGE 0 TO BALANCE_WIDTH := 0; -- Registri di pipeline
SIGNAL right_shift : INTEGER RANGE 0 TO BALANCE_WIDTH := 0; SIGNAL audio_in_reg : signed(TDATA_WIDTH - 1 DOWNTO 0);
SIGNAL bal_int : INTEGER; SIGNAL tlast_reg : STD_LOGIC;
SIGNAL valid_reg : STD_LOGIC;
-- Segnali di controllo
SIGNAL ready_int : STD_LOGIC;
SIGNAL processing_active : STD_LOGIC;
BEGIN BEGIN
-- Convert balance input to signed (-512 to +511)
balance_signed <= signed(balance);
-- Handshake & cattura dati in ingresso -- Calcolo dello shift amount con deadzone e scaling esponenziale
PROCESS (balance_signed)
VARIABLE centered_value : signed(BALANCE_WIDTH - 1 DOWNTO 0);
VARIABLE abs_value : unsigned(BALANCE_WIDTH - 2 DOWNTO 0);
VARIABLE exp_shift : INTEGER;
BEGIN
-- Centra il valore intorno a 0 (da -512 a +511 -> da -511 a +511)
centered_value := balance_signed - to_signed(CENTER_VALUE, BALANCE_WIDTH);
-- Inizializzazione
shift_amount_left <= 0;
shift_amount_right <= 0;
-- Calcola il valore assoluto
IF centered_value(BALANCE_WIDTH - 1) = '1' THEN -- negativo
abs_value := unsigned(-centered_value(BALANCE_WIDTH - 2 DOWNTO 0));
ELSE
abs_value := unsigned(centered_value(BALANCE_WIDTH - 2 DOWNTO 0));
END IF;
-- Applica deadzone e calcola shift
IF centered_value > DEADZONE THEN
-- Calcola lo shift per il canale sinistro (valori positivi)
exp_shift := (to_integer(abs_value) - DEADZONE) / 2 ** BALANCE_STEP_2 + 1;
IF exp_shift > MAX_SHIFT THEN
shift_amount_left <= MAX_SHIFT;
ELSE
shift_amount_left <= exp_shift;
END IF;
ELSIF centered_value <- DEADZONE THEN
-- Calcola lo shift per il canale destro (valori negativi)
exp_shift := (to_integer(abs_value) - DEADZONE) / 2 ** BALANCE_STEP_2 + 1;
IF exp_shift > MAX_SHIFT THEN
shift_amount_right <= MAX_SHIFT;
ELSE
shift_amount_right <= exp_shift;
END IF;
END IF;
END PROCESS;
-- Il resto del codice rimane IDENTICO alla versione originale
-- Logica di controllo AXI
PROCESS (aclk) PROCESS (aclk)
VARIABLE temp : signed(TDATA_WIDTH + MAX_SHIFT - 1 DOWNTO 0);
BEGIN BEGIN
IF rising_edge(aclk) THEN IF rising_edge(aclk) THEN
IF aresetn = '0' THEN IF aresetn = '0' THEN
tvalid_reg <= '0'; -- Reset asincrono
tdata_reg <= (OTHERS => '0'); valid_reg <= '0';
audio_in_reg <= (OTHERS => '0');
tlast_reg <= '0'; tlast_reg <= '0';
ELSIF s_axis_tvalid = '1' AND m_axis_tready = '1' THEN processing_active <= '0';
tvalid_reg <= '1'; ELSE
tdata_reg <= s_axis_tdata; -- Gestione del flusso dati
tlast_reg <= s_axis_tlast; IF ready_int = '1' THEN
ELSIF m_axis_tready = '1' THEN valid_reg <= '0';
tvalid_reg <= '0';
IF s_axis_tvalid = '1' THEN
-- Registrazione degli ingressi
audio_in_reg <= signed(s_axis_tdata);
tlast_reg <= s_axis_tlast;
valid_reg <= '1';
processing_active <= '1';
ELSE
processing_active <= '0';
END IF;
END IF;
-- Elaborazione del dato (sempre attiva)
IF processing_active = '1' OR valid_reg = '1' THEN
temp := resize(audio_in_reg, temp'length);
IF tlast_reg = '0' THEN
temp := shift_right(temp, shift_amount_left);
ELSE
temp := shift_right(temp, shift_amount_right);
END IF;
-- Saturazione
IF temp > 2 ** (TDATA_WIDTH - 1) - 1 THEN
m_axis_tdata <= STD_LOGIC_VECTOR(to_signed(2 ** (TDATA_WIDTH - 1) - 1, TDATA_WIDTH));
ELSIF temp <- 2 ** (TDATA_WIDTH - 1) THEN
m_axis_tdata <= STD_LOGIC_VECTOR(to_signed(-2 ** (TDATA_WIDTH - 1), TDATA_WIDTH));
ELSE
m_axis_tdata <= STD_LOGIC_VECTOR(temp(TDATA_WIDTH - 1 DOWNTO 0));
END IF;
m_axis_tlast <= tlast_reg;
END IF;
END IF; END IF;
END IF; END IF;
END PROCESS; END PROCESS;
s_axis_tready <= m_axis_tready; -- Logica combinazionale per tready
ready_int <= m_axis_tready OR NOT valid_reg;
s_axis_tready <= ready_int;
bal_int <= to_integer(unsigned(balance)); -- Assegnazione del valid in uscita
m_axis_tvalid <= valid_reg;
-- Calcolo shift esponenziale per balance con zona morta centrale e blocchi da 64
left_shift <= ((bal_int - (BAL_MID + DEAD_ZONE)) / BLOCK_SIZE) WHEN bal_int > (BAL_MID + DEAD_ZONE) ELSE 0;
right_shift <= (((BAL_MID - DEAD_ZONE) - bal_int) / BLOCK_SIZE) WHEN bal_int < (BAL_MID - DEAD_ZONE) ELSE 0;
-- Applicazione gain esponenziale tramite shift (process combinatorio)
PROCESS (tvalid_reg, tlast_reg, tdata_reg, left_shift, right_shift)
BEGIN
IF tvalid_reg = '1' THEN
IF tlast_reg = '0' THEN -- left
m_axis_tdata <= STD_LOGIC_VECTOR(shift_right(signed(tdata_reg), left_shift));
ELSE -- right
m_axis_tdata <= STD_LOGIC_VECTOR(shift_right(signed(tdata_reg), right_shift));
END IF;
ELSE
m_axis_tdata <= (OTHERS => '0');
END IF;
END PROCESS;
m_axis_tvalid <= tvalid_reg;
m_axis_tlast <= tlast_reg;
END Behavioral; END Behavioral;

68
LAB3/src/led_level_controller.vhd
View File

@@ -27,76 +27,90 @@ end led_level_controller;
architecture Behavioral of led_level_controller is architecture Behavioral of led_level_controller is
constant REFRESH_CYCLES : natural := (refresh_time_ms * 1_000_000) / clock_period_ns; constant REFRESH_CYCLES : natural := (refresh_time_ms * 1_000_000) / clock_period_ns;
signal volume_value : signed(CHANNEL_LENGHT-1 downto 0) := (others => '0'); signal volume_value : signed(CHANNEL_LENGHT-1 downto 0) := (others => '0');
signal abs_audio : unsigned(CHANNEL_LENGHT-2 downto 0) := (others => '0'); signal abs_audio_left : unsigned(CHANNEL_LENGHT-2 downto 0) := (others => '0');
signal leds_int : std_logic_vector(NUM_LEDS-1 downto 0) := (others => '0'); signal abs_audio_right : unsigned(CHANNEL_LENGHT-2 downto 0) := (others => '0');
signal led_update : std_logic := '0'; signal leds_int : std_logic_vector(NUM_LEDS-1 downto 0) := (others => '0');
signal refresh_counter : natural range 0 to REFRESH_CYCLES-1 := 0; signal led_update : std_logic := '0';
signal refresh_counter : natural range 0 to REFRESH_CYCLES-1 := 0;
begin begin
led <= leds_int; led <= leds_int;
s_axis_tready <= '1'; s_axis_tready <= '1';
-- Register the audio absolute value -- Registrazione del valore audio assoluto
process(aclk) process(aclk)
variable sdata_signed : signed(CHANNEL_LENGHT-1 downto 0);
variable abs_value : unsigned(CHANNEL_LENGHT-1 downto 0);
begin begin
if rising_edge(aclk) then if rising_edge(aclk) then
if aresetn = '0' then if aresetn = '0' then
volume_value <= (others => '0'); volume_value <= (others => '0');
abs_audio_left <= (others => '0');
abs_audio_right<= (others => '0');
elsif s_axis_tvalid = '1' then elsif s_axis_tvalid = '1' then
volume_value <= signed(s_axis_tdata); sdata_signed := signed(s_axis_tdata);
if volume_value(volume_value'high) = '1' then volume_value <= sdata_signed;
abs_audio <= unsigned(-volume_value(CHANNEL_LENGHT-2 downto 0)); -- Calcolo valore assoluto
if sdata_signed(CHANNEL_LENGHT-1) = '1' then
abs_value := unsigned(-sdata_signed);
else else
abs_audio <= unsigned(volume_value(CHANNEL_LENGHT-2 downto 0)); abs_value := unsigned(sdata_signed);
end if;
-- Assegna al canale corretto
if s_axis_tlast = '1' then -- Canale sinistro
abs_audio_left <= abs_value(CHANNEL_LENGHT-2 downto 0);
else -- Canale destro
abs_audio_right <= abs_value(CHANNEL_LENGHT-2 downto 0);
end if; end if;
end if; end if;
end if; end if;
end process; end process;
-- Refresh counter -- Contatore di refresh
process(aclk) process(aclk)
begin begin
if rising_edge(aclk) then if rising_edge(aclk) then
if aresetn = '0' then if aresetn = '0' then
refresh_counter <= 0; refresh_counter <= 0;
led_update <= '0'; led_update <= '0';
elsif refresh_counter = REFRESH_CYCLES-1 then
refresh_counter <= 0;
led_update <= '1';
else else
if refresh_counter = REFRESH_CYCLES-1 then refresh_counter <= refresh_counter + 1;
refresh_counter <= 0; led_update <= '0';
led_update <= '1';
else
refresh_counter <= refresh_counter + 1;
led_update <= '0';
end if;
end if; end if;
end if; end if;
end process; end process;
-- Linear scaling of the audio signal to LED levels -- Scaling lineare e aggiornamento LED
process(aclk) process(aclk)
variable leds_on : natural range 0 to NUM_LEDS; variable leds_on : natural range 0 to NUM_LEDS;
variable temp_led_level : integer range 0 to NUM_LEDS; variable temp_led_level : integer range 0 to NUM_LEDS;
variable abs_audio_sum : unsigned(CHANNEL_LENGHT-1 downto 0);
begin begin
if rising_edge(aclk) then if rising_edge(aclk) then
if aresetn = '0' then if aresetn = '0' then
leds_int <= (others => '0'); leds_int <= (others => '0');
elsif led_update = '1' then elsif led_update = '1' then
-- Automatic linear scaling calculation: abs_audio_sum := resize(abs_audio_left, CHANNEL_LENGHT) + resize(abs_audio_right, CHANNEL_LENGHT);
if to_integer(abs_audio) = 0 then
if (abs_audio_left = 0 and abs_audio_right = 0) then
temp_led_level := 0; temp_led_level := 0;
else -- -1 bit for sign, -4 to get 15+1 levels else
temp_led_level := to_integer(shift_right(abs_audio,CHANNEL_LENGHT-4-1))+1; -- Scaling automatico: puoi regolare la costante di shift per la sensibilit<69>
temp_led_level := 1 + to_integer(shift_right(abs_audio_sum, CHANNEL_LENGHT-4));
end if; end if;
-- Limit to maximum number of LEDs -- Limita al massimo numero di LED
if temp_led_level > NUM_LEDS then if temp_led_level > NUM_LEDS then
leds_on := NUM_LEDS; leds_on := NUM_LEDS;
else else
leds_on := temp_led_level; leds_on := temp_led_level;
end if; end if;
-- Aggiorna i LED
leds_int <= (others => '0'); leds_int <= (others => '0');
if leds_on > 0 then if leds_on > 0 then
leds_int(leds_on-1 downto 0) <= (others => '1'); leds_int(leds_on-1 downto 0) <= (others => '1');

9
LAB3/src/volume_multiplier.vhd
View File

@@ -28,12 +28,10 @@ END volume_multiplier;
ARCHITECTURE Behavioral OF volume_multiplier IS ARCHITECTURE Behavioral OF volume_multiplier IS
CONSTANT VOLUME_STEPS : INTEGER := (2 ** VOLUME_WIDTH) / (2 ** VOLUME_STEP_2); CONSTANT VOLUME_STEPS : INTEGER := (2 ** (VOLUME_WIDTH - 1)) / (2 ** VOLUME_STEP_2) + 1;
CONSTANT CENTER_VOLUME_STEP : INTEGER := (2 ** (VOLUME_WIDTH - 1) - 1) / (2 ** VOLUME_STEP_2) + 1;
SIGNAL volume_exp_mult : INTEGER RANGE -VOLUME_STEPS TO VOLUME_STEPS := 0; SIGNAL volume_exp_mult : INTEGER RANGE -VOLUME_STEPS TO VOLUME_STEPS := 0;
SIGNAL m_axis_tvalid_int : STD_LOGIC; SIGNAL m_axis_tvalid_int : STD_LOGIC;
BEGIN BEGIN
@@ -53,7 +51,7 @@ BEGIN
ELSE ELSE
-- Volume to signed and centered and convert to power of 2 exponent -- Volume to signed and centered and convert to power of 2 exponent
volume_exp_mult <= to_integer( volume_exp_mult <= to_integer(
shift_right(signed('0' & volume), VOLUME_STEP_2) - CENTER_VOLUME_STEP shift_right(signed('0' & volume) - to_signed(480, volume'length + 1), VOLUME_STEP_2)
); );
END IF; END IF;
@@ -74,6 +72,9 @@ BEGIN
m_axis_tdata <= (OTHERS => '0'); m_axis_tdata <= (OTHERS => '0');
ELSE ELSE
-- Default output signals
m_axis_tlast <= '0';
-- Clear valid flag when master interface is ready -- Clear valid flag when master interface is ready
IF m_axis_tready = '1' THEN IF m_axis_tready = '1' THEN
m_axis_tvalid_int <= '0'; m_axis_tvalid_int <= '0';

11
LAB3/vivado/volume_multiplier/volume_multiplier.xpr
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@@ -47,7 +47,7 @@
<Option Name="IPStaticSourceDir" Val="$PIPUSERFILESDIR/ipstatic"/> <Option Name="IPStaticSourceDir" Val="$PIPUSERFILESDIR/ipstatic"/>
<Option Name="EnableBDX" Val="FALSE"/> <Option Name="EnableBDX" Val="FALSE"/>
<Option Name="DSABoardId" Val="basys3"/> <Option Name="DSABoardId" Val="basys3"/>
<Option Name="WTXSimLaunchSim" Val="19"/> <Option Name="WTXSimLaunchSim" Val="49"/>
<Option Name="WTModelSimLaunchSim" Val="0"/> <Option Name="WTModelSimLaunchSim" Val="0"/>
<Option Name="WTQuestaLaunchSim" Val="0"/> <Option Name="WTQuestaLaunchSim" Val="0"/>
<Option Name="WTIesLaunchSim" Val="0"/> <Option Name="WTIesLaunchSim" Val="0"/>
@@ -95,6 +95,7 @@
</Config> </Config>
</FileSet> </FileSet>
<FileSet Name="sim_1" Type="SimulationSrcs" RelSrcDir="$PSRCDIR/sim_1" RelGenDir="$PGENDIR/sim_1"> <FileSet Name="sim_1" Type="SimulationSrcs" RelSrcDir="$PSRCDIR/sim_1" RelGenDir="$PGENDIR/sim_1">
<Filter Type="Srcs"/>
<File Path="$PPRDIR/../../sim/tb_volume_multiplier.vhd"> <File Path="$PPRDIR/../../sim/tb_volume_multiplier.vhd">
<FileInfo> <FileInfo>
<Attr Name="UsedIn" Val="synthesis"/> <Attr Name="UsedIn" Val="synthesis"/>
@@ -150,9 +151,7 @@
<Runs Version="1" Minor="15"> <Runs Version="1" Minor="15">
<Run Id="synth_1" Type="Ft3:Synth" SrcSet="sources_1" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/synth_1"> <Run Id="synth_1" Type="Ft3:Synth" SrcSet="sources_1" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/synth_1">
<Strategy Version="1" Minor="2"> <Strategy Version="1" Minor="2">
<StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"> <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"/>
<Desc>Vivado Synthesis Defaults</Desc>
</StratHandle>
<Step Id="synth_design"/> <Step Id="synth_design"/>
</Strategy> </Strategy>
<ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/> <ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/>
@@ -161,9 +160,7 @@
</Run> </Run>
<Run Id="impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" SynthRun="synth_1" IncludeInArchive="true" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/impl_1"> <Run Id="impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" SynthRun="synth_1" IncludeInArchive="true" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/impl_1">
<Strategy Version="1" Minor="2"> <Strategy Version="1" Minor="2">
<StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"> <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"/>
<Desc>Default settings for Implementation.</Desc>
</StratHandle>
<Step Id="init_design"/> <Step Id="init_design"/>
<Step Id="opt_design"/> <Step Id="opt_design"/>
<Step Id="power_opt_design"/> <Step Id="power_opt_design"/>