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They also determine the sources of the signal connected to that port. For example, ports labeled in and inout are sinks for a signal; ports labeled out, inout, and buffer are sources. , the external view of a design entity. This external view includes ports, generic and local constants, attributes, and error checking of the inputs to the design entity. The entity declaration provides information about this external interface to other architectures using the design entity. This information includes external electrical connections, which are specified with port declarations, and generic constraints, such as the acceptable range of operating temperatures for the device.

As simulation time advances, transactions are removed from the queue as their times pass from the future to the present and become the present driving value of the driver. A signal assignment statement edits the transactions in the associated driver. Editing refers to transactions being added to, deleted from, or inserted into the driver queue. The interaction of signal assignment statements and drivers is called propagation. VHDL supports two models of signal value propagation: inertial delay (the default) and transport delay.

11) 2-21 MIL-HDBK-62 architecture structure of horizontal_filter is component subtractor port ( A1: in pixel; A2: in pixel; Clock: in std_ulogic; DIFF: out filter_out ); end component; component adder port ( A1: in filter_out; A2: in filter_out; Clock: in std_ulogic; SUM: out filter_out ); end component; component delay port ( A_IN: in filter_out; Clock: in std_ulogic; A_OUT: out filter_out ); end component; signal S1: filter_out; -- Connects difference to 1st -- delay and 1st adder signal S2: filter_out; -- Connects 1st delay to 1st adder signal S3: filter_out; -- Connects 1st adder to 2nd delay -- and 2nd adder signal S4: filter_out; -- Connects 2nd delay to 2nd adder begin SUB: subtractor port map (P1, P3, Clock, S1); DELAY1: delay port map (S1, Clock, S2); ADD1: adder port map (S1, S2, Clock, S3); DELAY2: delay port map (S3, Clock, S4); ADD2: adder port map (S3, S4, Clock, H) end structure; Figure 2-18.

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