Accessing memory in user logic

Thank you for the information.

They are really helpful!

I have successfully written the data to the desired addresses finally..

The "HELLO WORLD" appears right where expected but it's interesting

to see that there were data written on random addresses in the memory map at the same time.

Eg. In the screenshot there are random characters besides HELLO WORLD ..

I've spent quite a long time looking into it but cannot really locate the problem, could it be more subtle or is there anything obvious I am overlooking ..?

ps. My data bus is 32 bits ( [31:0] )but I am only using the last 8 bits( [7:0] ) to write into my memory block since the data width in memory are 8 bits.

Thank you again!