TMS320F280049: Question about the execution time of CLA instruction

Green Deng

Part Number: TMS320F280049

Dear team:

My customer tested the execution time of the below two instructions and found that:

The execution time of the first instruction is compliance with the data described in the data manual which is 1 clock.

But the second instruction need 2 clocks which the data manual described is still 1 clock.

He got the time by flipping the IO level in the CLA and measuring the waveform with an oscilloscope. Testing code is as below:

Best regards

0 Veena Kamath over 3 years ago

Hi,

From the F28004x TR<M CLA instruction set section, the instruction takes 1 cycle.

Can you tell us which document had it documented as 2 cycles?

Regards,

Veena

0 jiabao an over 3 years ago in reply to Veena Kamath

The data manual says one cycle, but my actual test took two cycles. I don't understand the specific reason.

This instruction： MMOV16 @_EPwm1Regs.CMPA.bit.CMPA, MR2

0 Veena Kamath over 3 years ago in reply to jiabao an

Hi,

I am checking with the design owner on this query.

Meanwhile, can you quickly check if the same behavior is observed when trying to write to LSRAM?

Regards,

Veena

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