ELSIF (FS_ipd='Z') THEN                N := N_mid;            ELSIF (FS_ipd='1') THEN                N := N_high;            END IF;            tU <= ref_period/N;        END IF;    END PROCESS ADJ;    ----------------------------------------------------------------------------    -- PLL Process    ----------------------------------------------------------------------------    PLL : PROCESS (pll_out, REF_ipd, TEST_ipd)        VARIABLE prev_pll      : time := 0 ns;        -- Timing Check Variables        VARIABLE Pviol_REF     : X01 := '0';        VARIABLE PD_REF        : VitalPeriodDataType := VitalPeriodDataInit;    BEGIN        ------------------------------------------------------------------------        -- Timing Check Section        ------------------------------------------------------------------------        IF (TimingChecksOn) THEN            VitalPeriodPulseCheck (                TestSignal      => pll_out,                TestSignalName  => "PLL",                Period          => tperiod_REF_FS_EQ_0,                CheckEnabled    => (FS_ipd = '0'),                HeaderMsg       => InstancePath & partID,                PeriodData      => PD_REF,                XOn             => XOn,                MsgOn           => MsgOn,                Violation       => Pviol_REF            );            VitalPeriodPulseCheck (                TestSignal      => pll_out,                TestSignalName  => "PLL",                Period          => tperiod_REF_FS_EQ_Z,                CheckEnabled    => (FS_ipd = 'Z'),                HeaderMsg       => InstancePath & partID,                PeriodData      => PD_REF,                XOn             => XOn,                MsgOn           => MsgOn,                Violation       => Pviol_REF            );            VitalPeriodPulseCheck (                TestSignal      => pll_out,                TestSignalName  => "PLL",                Period          => tperiod_REF_FS_EQ_1,                CheckEnabled    => (FS_ipd = '1'),                HeaderMsg       => InstancePath & partID,                PeriodData      => PD_REF,                XOn             => XOn,                MsgOn           => MsgOn,                Violation       => Pviol_REF            );            Violation <= Pviol_REF;        END IF;        IF TEST_ipd = '0' THEN            pll_out <= TRANSPORT not pll_out AFTER pll_delay + half_per;        ELSE            pll_out <= REF_ipd;        END IF;        IF rising_edge(pll_out) THEN            IF not vco_lock THEN                period <= NOW - prev_pll;            END IF;            prev_pll := NOW;        END IF;    END PROCESS PLL;    ----------------------------------------------------------------------------    -- Q1 Process    ----------------------------------------------------------------------------    Q1P : PROCESS (pll_out, F1A_ipd, F1B_ipd)    VARIABLE F1    : std_logic_vector(1 downto 0);    BEGIN        F1 := F1B_ipd & F1A_ipd;        CASE F1 IS            WHEN "00" => Q1 <= TRANSPORT pll_out AFTER (period - tU * 4);            WHEN "0Z" => Q1 <= TRANSPORT pll_out AFTER (period - tU * 3);            WHEN "01" => Q1 <= TRANSPORT pll_out AFTER (period - tU * 2);            WHEN "Z0" => Q1 <= TRANSPORT pll_out AFTER (period - tU);            WHEN "ZZ" => Q1 <= TRANSPORT pll_out AFTER period;            WHEN "Z1" => Q1 <= TRANSPORT pll_out AFTER (period + tU);            WHEN "10" => Q1 <= TRANSPORT pll_out AFTER (period + tU * 2);            WHEN "1Z" => Q1 <= TRANSPORT pll_out AFTER (period + tU * 3);            WHEN "11" => Q1 <= TRANSPORT pll_out AFTER (period + tU * 4);            WHEN others => null;        END CASE;    END PROCESS Q1P;    ----------------------------------------------------------------------------    -- Q2 Process    ----------------------------------------------------------------------------    Q2P : PROCESS (pll_out, F2A_ipd, F2B_ipd)    VARIABLE F2    : std_logic_vector(1 downto 0);    BEGIN        F2 := F2B_ipd & F2A_ipd;        CASE F2 IS            WHEN "00" => Q2 <= TRANSPORT pll_out AFTER (period - tU * 4);            WHEN "0Z" => Q2 <= TRANSPORT pll_out AFTER (period - tU * 3);            WHEN "01" => Q2 <= TRANSPORT pll_out AFTER (period - tU * 2);            WHEN "Z0" => Q2 <= TRANSPORT pll_out AFTER (period - tU);            WHEN "ZZ" => Q2 <= TRANSPORT pll_out AFTER period;            WHEN "Z1" => Q2 <= TRANSPORT pll_out AFTER (period + tU);            WHEN "10" => Q2 <= TRANSPORT pll_out AFTER (period + tU * 2);            WHEN "1Z" => Q2 <= TRANSPORT pll_out AFTER (period + tU * 3);            WHEN "11" => Q2 <= TRANSPORT pll_out AFTER (period + tU * 4);            WHEN others => null;        END CASE;    END PROCESS Q2P;    ----------------------------------------------------------------------------    -- Q3 Process    ----------------------------------------------------------------------------    Q3P : PROCESS (pll_out, F3A_ipd, F3B_ipd)    VARIABLE F3    : std_logic_vector(1 downto 0);        -- Functionality Results Variables        VARIABLE PrevData       : std_logic_vector(0 to 2);        VARIABLE PrevData2      : std_logic_vector(0 to 2);        VARIABLE PrevData4      : std_logic_vector(0 to 2);        VARIABLE CLK_div_2      : std_ulogic := '0';        VARIABLE CLK_div_2a     : std_ulogic := '0';        VARIABLE CLK_div_4      : std_ulogic := '0';    BEGIN        F3 := F3B_ipd & F3A_ipd;        CASE F3 IS            WHEN "00" =>                 VitalStateTable (                    StateTable      => TFFR_tab,                    DataIn          => (Violation, pll_out, rst_int),                    Result          => CLK_div_2,                    PreviousDataIn  => PrevData                );                Q3 <= TRANSPORT CLK_div_2 AFTER period;            WHEN "0Z" => Q3 <= TRANSPORT pll_out AFTER (period - tU * 6);            WHEN "01" => Q3 <= TRANSPORT pll_out AFTER (period - tU * 4);            WHEN "Z0" => Q3 <= TRANSPORT pll_out AFTER (period - tU * 2);            WHEN "ZZ" => Q3 <= TRANSPORT pll_out AFTER period;            WHEN "Z1" => Q3 <= TRANSPORT pll_out AFTER (period + tU * 2);            WHEN "10" => Q3 <= TRANSPORT pll_out AFTER (period + tU * 4);            WHEN "1Z" => Q3 <= TRANSPORT pll_out AFTER (period + tU * 6);            WHEN "11" =>                 VitalStateTable (                    StateTable      => TFFR_tab,                    DataIn          => (Violation, pll_out, rst_int),                    Result          => CLK_div_2a,                    PreviousDataIn  => PrevData2                );                VitalStateTable (                    StateTable      => TFFR_tab,                    DataIn          => (Violation, CLK_div_2a, rst_int),                    Result          => CLK_div_4,                    PreviousDataIn  => PrevData4                );                Q3 <= TRANSPORT CLK_div_4 AFTER period;            WHEN others => null;        END CASE;    END PROCESS Q3P;    ----------------------------------------------------------------------------    -- Q4 Process    ----------------------------------------------------------------------------    Q4P : PROCESS (pll_out, F4A_ipd, F4B_ipd)    VARIABLE F4    : std_logic_vector(1 downto 0);        -- Functionality Results Variables        VARIABLE PrevData       : std_logic_vector(0 to 2);        VARIABLE CLK_div_2      : std_ulogic := '0';    BEGIN        F4 := F4B_ipd & F4A_ipd;        CASE F4 IS            WHEN "00" =>                 VitalStateTable (                    StateTable      => TFFR_tab,                    DataIn          => (Violation, pll_out, rst_int),                    Result          => CLK_div_2,                    PreviousDataIn  => PrevData                );                Q4 <= TRANSPORT CLK_div_2 AFTER period;            WHEN "0Z" => Q4 <= TRANSPORT pll_out AFTER (period - tU * 6);            WHEN "01" => Q4 <= TRANSPORT pll_out AFTER (period - tU * 4);            WHEN "Z0" => Q4 <= TRANSPORT pll_out AFTER (period - tU * 2);            WHEN "ZZ" => Q4 <= TRANSPORT pll_out AFTER period;            WHEN "Z1" => Q4 <= TRANSPORT pll_out AFTER (period + tU * 2);            WHEN "10" => Q4 <= TRANSPORT pll_out AFTER (period + tU * 4);            WHEN "1Z" => Q4 <= TRANSPORT pll_out AFTER (period + tU * 6);            WHEN "11" => Q4 <= TRANSPORT not pll_out AFTER period;            WHEN others => null;        END CASE;    END PROCESS Q4P;END vhdl_behavioral;