Simple Module ExamplesSource Module

LIBRARY uvalib;

USE uvalib.uva.ALL;

ENTITY Source IS

GENERIC (Step : TIME);

PORT (Data_Output : INOUT Token;

END Source;

Architecture Ar_Source OF Source IS

BEGIN

PROCESS

BEGIN

Place_Token(Data_Output);

WAIT UNTIL Token_Acked(Data_Output);

Release_Token(Data_Output);

WAIT UNTIL Token_Removed(Data_Output);

WAIT FOR Step;

END PROCESS;

END Ar_Source;

UVa

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The description of the source module above is a greatly simplified version of the source module found in the ADEPT library. Note that this and the subsequent model descriptions assume that the package presented in this example will be compiled into the “uvalib” library.

The description above is sequential in nature in that the source module activates its token driver (i.e. “places” a token), waits for the adjacent module to activate its driver (i.e. by it “acknowledging” the token), inactivates its driver (i.e. “releases” the token), waits for the adjacent module to inactivate its driver (i.e. by it “removing” the token), and finally waits for the specified delay before beginning the sequence again.

[UM93]