Xilinx microblaze : SRAM external mem controller

Hi Richard,

microblaze to communicate with a 128 KB asynchronous SRAM chip (IS63LV1024).

communicate with the SRAM chip. However, I can only write to the

updated instead.

There are two possiblilites

Software:

--------- So how do you write to memory? In C you should be aware to declare your pointer according to the data width you want to write.

int *my_memory_pointer = 0x0f100001;

char *my_memory_pointer = 0x0f100001;

Hardware:

---------- How is your memory connected? Are you shure your byte - enable signals an not tied together?

--- In order to check whether your hardware or your software is the reason for your problem try writing to memory using xmd. Do not start any software on your microblaze. Start xmd. Connect to the microblaze. Use the mwr command. Example:

c:> xmd -> this starts xmd xmd> mbconnect (stub/mdm) -> connects you to your microblaze, in case you do not now -> how this works check the mb docmentation xmd> mrd 0x0f100000 -> read address 0x0f100000 (the whole word) [...] -> there should be the content of your memory xmd> mwr 0x0f100001 0x31 b -> writes _b_ytewise to memrory xmd> mrd 0x0f100000 -> read address 0x0f100000 [...] -> did it succeed? when not, your hw might be wrong -> otherwise you have to change your programm

Erik

WRONG, if you look at XMD stub you see the stub only support

antti

True,

You have to use the HW debug logic in MicroBlaze and the opb_mdm.

This will give you true byte-write and a lot of other things.

Göran

Antti Lukats wrote: