The test benches that correspond to the models are shown in the
following list:

        Model:            Test Bench:
        ------            -----------
        SN54xx00        SN54xx00_TB
        SN54xx02        SN54xx02_TB
        SN54xx04        SN54xx04_TB
        SN54xx08        SN54xx08_TB
        SN54xx10        SN54xx10_TB
        SN54xx109       SN54xx109_TB
        SN54xx11        SN54xx11_TB
        SN54xx112A      SN54xx112A_TB
        SN54xx138       SN54xx138_TB
        SN54xx140       SN54xx140_TB
        SN54xx161A      SN54xx161A_TB
        SN54xx175       SN54xx175_TB
        SN54xx20        SN54xx20_TB
        SN54xx21        SN54xx21_TB
        SN54xx251       SN54xx251_TB
        SN54xx27        SN54xx27_TB
        SN54xx280       SN54xx280_TB
        SN54xx30        SN54xx30_TB
        SN54xx32        SN54xx32_TB
        SN54xx33        SN54xx33_TB
        SN54xx368A      SN54xx368A_TB
        SN54xx38        SN54xx38_TB
        SN54xx86        SN54xx86_TB
