SDRAM doesnt work properly

Hi.

Im using IS42S16400J SDram.

It was working fine when i first mounted it(its my own pcb design).

But there was some problem with the i2c pins so i had do unmount the stm32h745 and mount it again.

Now with the same code the sdram is not working fine.

The first time i write it i see in the memory region that its changed but suddenly it change to other random data.

If i write the sdram in the while loop every 1 ms the sdram works good but it wasnt like this before.

I have tested all the pins and all of them are connected.

I pulled up the sdram pins internally with cubemx but the out put will be 0xFF for all the memory. And if i pull it down the memory will be all 0x00;

I think its hardware.

Can anyone help me where the problem is?

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