UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

cancel
Showing results for 
Search instead for 
Did you mean: 
Visitor bjskill
Visitor
3,359 Views
Registered: ‎08-31-2012

Unable to access data stored in BRAM from custom IP peripheral using AXI BRAM controller

Hi,

 

I'm currently developing a MicroBlaze-based system that has some custom IP that writes data to a block RAM (BRAM) that is on the local memory bus (LMB).  Unfortunately, the LMB now has been maxed out with 16 peripherals and I need to add a couple more BRAM's to the system.  So, I have been attempting to use the AXI BRAM controller to access the data stored on the BRAM.

 

I referenced the data sheet (DS777) and I have configured the AXI BRAM controller to use a single port (PORT A) for the R/W access to PORT A on this BRAM.  This leave PORT B on the BRAM available to connect to my custom IP block.  This method works fine when using the LMB controller but implement the AXI controller on a system build, I'm unable to write to the BRAM's using the SDK Memory Debugger.

 

I have also tried adjusting various parameters for my XPS builds:

   * Using both AXI4 and AXI4Lite

   * Adjusting the C_S_AXI_ID_WIDTH parameter between 1 and 4 [which always seems to be shown as one (1) on the AXI BRAM controller dialog box even though the default is four (4)]

   * Adjusting where in the MicroBlaze memory map the controller resides

 

So far, all attempts have failed to allow me to write data to these BRAM's.  Any assistance on how I might be able to solve this problem would be appreciated. 

 

- Brad

 

0 Kudos
2 Replies
Explorer
Explorer
3,166 Views
Registered: ‎12-05-2012

Re: Unable to access data stored in BRAM from custom IP peripheral using AXI BRAM controller

Did u find a solution for your problem.
I can write to BRAM and I store those values in DDR via CDMA.
But cannot read values from AXI BRAM. I am sure that my problem is AXI BRAM Controller.

If u know anything please help me
0 Kudos
Visitor pankajp12
Visitor
2,619 Views
Registered: ‎03-13-2014

Re: Unable to access data stored in BRAM from custom IP peripheral using AXI BRAM controller

I want to write images for video processing to BRAM and I store those values.

How to access block ram...where i find step/procedure to know to access BRAM using microblaze.

0 Kudos