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VHDL-AMS Analog Pins: TERMINALS

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In order to define analog pins in VHDL-AMS we need to use the TERMINAL keyword in a standard entity PORT declaration. For example, if we have a two pins device that has two analog pins (of type electrical, more on this later), then the entity would have the basic form as shown here:

1 library ieee;

2 use ieee.electrical_systems.all; 3 entity model is

4 generic();

5 port( 6 terminal p : electrical;

7 terminal m : electrical

8 );

9 end entity;

Notice that as the VHDL-AMS extensions are defined as an IEEE standard, then the use of a standard library such as electrical pins requires the use of the:

1 electrical_systems.all;

packages from the IEEE library. 

Notice that the pins do not have a direction assigned as analog pins are part of a conserved energy system and are therefore solved simultaneously.

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