Is SCLK0 always limited to 50MHz when using the SMC?

Hi,

We are checking on this and will get back to you as soon as possible.

Regards,
Nandini C

Hi,

Yes, your understanding is correct. As per the ADSP-BF70x datasheet, SCLK0 is limited to 50MHz when the SMC operates with respect to SYS_CLKOUT.
As mentioned in the HRM, when using the asynchronous memory, the SMC_B0TIM – SMC_B3TIM registers control the timing characteristics of the asynchronous memory interface using different parameters like setup, hold, or access times for reads and writes. Each of these parameters can be programmed in terms of SCLK0 clock cycles. For more information, please refer the "Static Memory Controller (SMC)" chapter in the ADSP-BF70x HRM manual.

Regards,
Nandini C

Hi,

yes, I understand that the 50MHz limit applies when operating with respect to SYS_CLKOUT. But I have an asynchronous memory that doesn't require a clock signal, so I could just set CLKOUTSEL to something other than SCLK0 because I don't need it anyway. The question is whether or not SCLK0 would still be limited to 50MHz in this specific case.

In other words, I want to use the SMC at 100MHz, without SYS_CLKOUT, but from the datasheet it isn't clear to me if that is possible.

Regards,

Felix

Hi Felix,

We are checking this internally and will get back to you as soon as possible.

Regards,
Nandini C

Hi Felix,

Apologies for the delay.

It is tested at 50MHz, so that is the max frequency supported.

Regards,
Nandini C

Hi Felix,

Apologies for the delay.

It is tested at 50MHz, so that is the max frequency supported.

Regards,
Nandini C