Unable to run Generic Serial Flash Interface IP at 100 MHz

Hi,

I am working on a Cyclone V, writing an epcq128A using Generic Serial Flash Interface Intel IP.

After integrating the IP and connected it to the HPS in the platform designer, I am now able to do so using C bare metal and pointers dereferencing.

My point is that everything works perfectly at a low frequency, when the IP is connected to a 50 MHz pll and a 32 times clock divider set on the IP. However, when I am trying to write to the EPCQ with a 100 MHz pll and a 4 times clock divider or lower, my processor crashes during my memcpy call.

NB : This behaviour only concerns writing, I can read at those frequencies without problem.

I saw on the reference manual that the clock IP can be pushed up to 100 MHz. So I am way below the limits.

My control registers are set as below :

• Addressing mode : 4 bytes addressing
• Chip Select : 0x0 to select the first device since I only have one.
• SPI Baud rate divisor : from 32 to 2, but below 4 times dividor, the µC crashes
• CS Assert : set to 5, as mentioned in the RM.
• Write and Read instruction are set accordingly to the epcq's datasheet

Regards

Versions :

• Quartus Prime 2018
• Generic Serial Flash Interface Intel IP 18.0