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Altera_Forum
Honored Contributor I
1,752 Views

How to write data into DDR3 SDRAM-HPS!

Hi everyone! 

I create Qsys to connect SDRAM/FPGA that saves data of camera with HPS. I will read this data by arm through H2F AXI Bridge and send it to VGA. I use 2 components: "Frame Reader" and "clocker video output". But component "Frame Reader" connect to F2H Bridge (0x00000000 - 0xFFFFFFFF). So, I think I should write data that read from SDRAM/FPGA into DDR3-SDRAM/HPS. Afterthat, "Frame Reader" will receive this data anh tranfer to "clocker video output"-->VGA 

Whether that is good solution or not. 

Please give me a device and a direction how to write data into DDR3-SDRAM/HPS. 

Thank you so much!
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8 Replies
Altera_Forum
Honored Contributor I
289 Views

According to your post, it seems that your Frame Reader has access to the entire HPS address space. If you are using a Cyclone V SOC, the HPS SDRAM address starts at 0x0010_0000 and ends at 0xC000_0000  

Try writing to 0x0010_0000 and see whether that works :)
Altera_Forum
Honored Contributor I
289 Views

Hi WH2011 

Thank you for your reply.  

As your comment, the HPS SDRAM address starts at 0x0010_0000 and ends at 0xC000_0000. Because, I don't find the material that mention this feature, Do you give me the related material. 

Thank you! 

I am looking forward your reply!
Altera_Forum
Honored Contributor I
289 Views

https://www.alteraforum.com/forum/attachment.php?attachmentid=9331  

 

The above shows the memory mapping of the FPGA into the ARM. Your FPGA has access to the physical address of the HPS SDRAM starting from 0x10_0000. Note however that the Qsys Avalon address bus to the HPS SDRAM port is only 29 bits wide instead of 32 bits. Thus, you can only access memory up to address 0xa000_0000 from the FPGA. 

 

I recommend you look at the Macnica online video http://www.macnica-na.com/vworkshops/courses-altera-soc for a great tutorial on this subject.
Altera_Forum
Honored Contributor I
289 Views

 

--- Quote Start ---  

https://www.alteraforum.com/forum/attachment.php?attachmentid=9331  

 

The above shows the memory mapping of the FPGA into the ARM. Your FPGA has access to the physical address of the HPS SDRAM starting from 0x10_0000. Note however that the Qsys Avalon address bus to the HPS SDRAM port is only 29 bits wide instead of 32 bits. Thus, you can only access memory up to address 0xa000_0000 from the FPGA. 

 

I recommend you look at the Macnica online video http://www.macnica-na.com/vworkshops/courses-altera-soc for a great tutorial on this subject. 

--- Quote End ---  

 

 

Hi WH2011! 

Thank you so much for introducing the great website like this. It's very useful for me 

I would like to share something about my project with you:Firstly, I use a camera TRDB D5M of altera, the picture from camera will be stored at DDR3-FPGA, then displaying VGA. My result is good, Attached image below is my design system in Qsys. 

Now, I would like to use HPS in my design. I intend to read data from DDR3-FPGA to save DDR3-HPS, then Frame Reader will be read this data and output to VGA. 

How do you think about my ideal, if it is possible or not. 

Best Regards!https://www.alteraforum.com/forum/attachment.php?attachmentid=9332
Altera_Forum
Honored Contributor I
289 Views

It is definitely possible. However, you need to use the HPS-FPGA axi bus and not the lightweight axi bus for higher data throughput.

Altera_Forum
Honored Contributor I
289 Views

 

--- Quote Start ---  

It is definitely possible. However, you need to use the HPS-FPGA axi bus and not the lightweight axi bus for higher data throughput. 

--- Quote End ---  

 

 

Hi WH2011! 

I think I will use 3 bridges:  

+ Lightweight axi: this only use to control Frame Reader 

+ HPS-FPGA Bridge: I will use this bridge to read data from DDR3-FPGA to save to DDR3-HPS 

+ FPGA-HPS Bridge: Frame Reader will be connected with this bridge to read data from DDR3-HPS and output to VGA 

Now, I am doing this project, but I have a problem when using arm to read data from DDR3-FPGA and Frame Reader read data from DDR3-HPS and output to VGA. 

Do you give me a direction for me 

Sorry if I disturb you! 

BR,
Altera_Forum
Honored Contributor I
289 Views

I can't help you if you don't tell me the specifics of the problem you're facing. Are you using Linux for your HPS? I can give you some general tips though: 

 

1. The HPS SDRAM ports must be configured to an Avalon bus. I tried AXI but it does not work. 

2. If you're using Linux, the preloader must be regenerated everytime you modify the HPS Qsys component 

3. Use the following steps to initiate the HPS-FPGA HPS SDRAM interface properly if using Linux: 

-Cold boot HPS 

-Load FPGA image 

-Warm boot HPS
Altera_Forum
Honored Contributor I
289 Views

Hi , 

i want to write data which is come from ethernet(connected with fpga) to hps-sdram. And then i have to read the hps-sdram and send out by serial using rs422.  

i don't have any knowledge about HPS. tell me some suggestion.
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