LIBRARY IEEE; Include Libraries for standard logic data types USE IEEE.STD_LOGIC_1164.ALL; -- Entity name normally the same as file name.

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Presentation transcript:

LIBRARY IEEE; -- Include Libraries for standard logic data types USE IEEE.STD_LOGIC_1164.ALL; -- Entity name normally the same as file name ENTITY gate_network IS -- Ports: Declares module inputs and outputs PORT( A, B, C : IN STD_LOGIC; -- Standard Logic Vector ( Array of 4 Bits ) D : IN STD_LOGIC_VECTOR( 3 DOWNTO 0 ); -- Output Signals X, Y : OUT STD_LOGIC ); END gate_network; -- Defines internal module architecture ARCHITECTURE behavior OF gate_network IS BEGIN -- Concurrent assignment statements operate in parallel -- D(1) selects bit 1 of standard logic vector D X <= A AND NOT( B OR C ) AND ( D( 1 ) XOR D( 2 ) ); -- Process must declare a sensitivity list, -- In this case it is ( A, B, C, D ) -- List includes all signals that can change the outputs PROCESS ( A, B, C, D ) BEGIN -- Statements inside process execute sequentially Y <= A AND NOT( B OR C) AND ( D( 1) XOR D( 2 ) ); END PROCESS; END behavior;

Figure 6.1 State Diagram for st_mach example

Figure 6.2 Schematic of Hierarchical Design

ENTITY hierarch IS. PORT (. clock_25Mhz, pb1. : IN STD_LOGIC; ENTITY hierarch IS PORT ( clock_25Mhz, pb1 : IN STD_LOGIC; pb1_single_pulse : OUT STD_LOGIC); END hierarch; ARCHITECTURE structural OF hierarch IS -- Declare internal signals needed to connect submodules SIGNAL clock_1MHz, clock_100Hz, pb1_debounced : STD_LOGIC; COMPONENT debounce -- Use Components to Define Submodules and Parameters PORT( pb, clock_100Hz : IN STD_LOGIC; pb_debounced : OUT STD_LOGIC); END COMPONENT; COMPONENT onepulse PORT(pb_debounced, clock : IN STD_LOGIC; pb_single_pulse : OUT STD_LOGIC); END COMPONENT; COMPONENT clk_div PORT( clock_25Mhz : IN STD_LOGIC; clock_1MHz : OUT STD_LOGIC; clock_100KHz : OUT STD_LOGIC; clock_10KHz : OUT STD_LOGIC; clock_1KHz : OUT STD_LOGIC; clock_100Hz : OUT STD_LOGIC; clock_10Hz : OUT STD_LOGIC; clock_1Hz : OUT STD_LOGIC); END COMPONENT; BEGIN -- Use Port Map to connect signals between components in the hierarchy debounce1 : debounce PORT MAP ( pb => pb1, clock_100Hz = >clock_100Hz, pb_debounced = >pb1_debounced); prescalar : clk_div PORT MAP ( clock_25Mhz = >clock_25Mhz, clock_1MHz =>clock_1Mhz, clock_100hz = >clock_100hz); single_pulse : onepulse PORT MAP ( pb_debounced = >pb1_debounced, clock => clock_1MHz, pb_single_pulse => pb1_single_pulse); END structural;

Figure 6.3 Using a Testbench for automatic verfication