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Original question:

TMS320F28379D: CLB Example1 project equations in Sysconfig process

TMS320F28379D: CLB Example1 - Purpose of FSM and Counter

Andrew Green
Prodigy 60 points
Part Number: TMS320F28379D
Other Parts Discussed in Thread: C2000WARE

Hi

A couple of questions:

1)  What was the intended purpose of the FSM and Counters added to CLB Example1? Just want to make sure I am not missing

something obscure. Presumably it will run without them?

2) In all the examples, all the CLB inputs are configured to something even if they are not actually used as inputs to the logic. Is that necessary?

CLB_configLocalInputMux(CLB1_BASE, CLB_IN0, CLB_LOCAL_IN_MUX_GLOBAL_IN);
CLB_configLocalInputMux(CLB1_BASE, CLB_IN1, CLB_LOCAL_IN_MUX_GLOBAL_IN);
CLB_configLocalInputMux(CLB1_BASE, CLB_IN2, CLB_LOCAL_IN_MUX_GLOBAL_IN);
CLB_configLocalInputMux(CLB1_BASE, CLB_IN3, CLB_LOCAL_IN_MUX_GLOBAL_IN);
CLB_configLocalInputMux(CLB1_BASE, CLB_IN4, CLB_LOCAL_IN_MUX_GLOBAL_IN);
CLB_configLocalInputMux(CLB1_BASE, CLB_IN5, CLB_LOCAL_IN_MUX_GLOBAL_IN);
CLB_configLocalInputMux(CLB1_BASE, CLB_IN6, CLB_LOCAL_IN_MUX_GLOBAL_IN);
CLB_configLocalInputMux(CLB1_BASE, CLB_IN7, CLB_LOCAL_IN_MUX_GLOBAL_IN);

CLB_configGlobalInputMux(CLB1_BASE, CLB_IN0, CLB_GLOBAL_IN_MUX_EPWM1_CTRDIR);
CLB_configGlobalInputMux(CLB1_BASE, CLB_IN1, CLB_GLOBAL_IN_MUX_EPWM1_CTRDIR);
CLB_configGlobalInputMux(CLB1_BASE, CLB_IN2, CLB_GLOBAL_IN_MUX_EPWM1A);
CLB_configGlobalInputMux(CLB1_BASE, CLB_IN3, CLB_GLOBAL_IN_MUX_EPWM1B);
CLB_configGlobalInputMux(CLB1_BASE, CLB_IN4, CLB_GLOBAL_IN_MUX_EPWM1_CTRDIR);
CLB_configGlobalInputMux(CLB1_BASE, CLB_IN5, CLB_GLOBAL_IN_MUX_EPWM1_CTRDIR);
CLB_configGlobalInputMux(CLB1_BASE, CLB_IN6, CLB_GLOBAL_IN_MUX_EPWM1_CTRDIR);
CLB_configGlobalInputMux(CLB1_BASE, CLB_IN7, CLB_GLOBAL_IN_MUX_EPWM1_CTRDIR);

//
// Inputs set to GP register
//
CLB_configGPInputMux(CLB1_BASE, CLB_IN0, CLB_GP_IN_MUX_GP_REG);
CLB_configGPInputMux(CLB1_BASE, CLB_IN1, CLB_GP_IN_MUX_GP_REG);
CLB_configGPInputMux(CLB1_BASE, CLB_IN2, CLB_GP_IN_MUX_EXTERNAL);
CLB_configGPInputMux(CLB1_BASE, CLB_IN3, CLB_GP_IN_MUX_EXTERNAL);
CLB_configGPInputMux(CLB1_BASE, CLB_IN4, CLB_GP_IN_MUX_GP_REG);
CLB_configGPInputMux(CLB1_BASE, CLB_IN5, CLB_GP_IN_MUX_GP_REG);
CLB_configGPInputMux(CLB1_BASE, CLB_IN6, CLB_GP_IN_MUX_GP_REG);
CLB_configGPInputMux(CLB1_BASE, CLB_IN7, CLB_GP_IN_MUX_GP_REG);

CLB_setGPREG(CLB1_BASE, mode);

CLB_setOutputMask(CLB1_BASE, 0x5, true);

Thanks

Andrew

  • 0
    TI__Genius 13881 points

    Hi Andrew,

    Thank you for reaching out. To answer your questions about the CLB:

    1) The FSM_0, FSM_1 and COUNTER_0 and COUNTER_1 modules do not serve a purpose (since the FSMs do not have any state output functions and the COUNTERs are not configured to count). For this example, CLB tile output 0 and output 2 override EPWM1A and EPWM1B, respectively, hence LUT_0 and LUT_1 perform the necessary combinatorial logic.

    2) It is not necessary to configure the CLB inputs for unused inputs (so in example 1, inputs 0 through 3 are necessary and 4 through 7 are not). In fact, in our latest versions of C2000ware SDK (starting with 4.00.00.00) these unnecessary inputs were removed.

    Hopefully this resolved your questions and please reach out if you have any other questions.

    Regards,

    Peter

  • 0 in reply to Peter Luong1
    Prodigy 60 points

    Hi Peter

    Thank you.