CCS/TMS320C6748: TMS320C6748 EMIF transfer rate problem

Tool/software: Code Composer Studio

Hi Sir/Madam,

We are using TI TMS320C6748 DSP for development purposes in our project.

Firstly, we aimed to configure CPU speed as 450 Mhz and EMIF speed as 25 Mhz.

For that purpose, we used below values for FPGA EMIF (EMIFA_CE4CFG register)

In order to to configure CPU speed as 450 Mhz and EMIF speed as 25 Mhz, we set up PLL0 register with below values;

Then we run a simple code which sends 10 bytes (1,0,1,0...). But 1 byte transfer rate was bigger than 800 ns.

We tried different values for "write strobe" and the most efficient transfer rate became 710 ns as shown below Oscilloscope analysis (shown with yellow line).

We did not understand why the transfer rate is so much. We expected much more small transfer rates for data transfer on EMIF bus.

Could you please help us about this issue? We are open for recommendations.

Thanks in advance.

Best Regards

Ahmet