Sun Jul 21, 4: I have managed to produce a bit file with initialized RAMs. This week, I have completed integrating the K3rangka with S3padu from Read more…. This is how the unconstrained Place put them into the design. Perhaps it does not, because the BMM file is not passed as a parameter to the synthesizer. Here is the command for this process data2mem -bm file.


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A key vata2mem using Data2MEM to perform the gymnastics necessary is to define the memory space, and to correctly associate the netlist names of the block RAMs to their locations in the routed design.

This is how the unconstrained Place put them into the design.


The reason for this desire is because currently it takes about 2 minutes to fully run the 4 stages Synthesis, Implementation, Generate Program File, Configure Target Device.

Thus, on my first cut, the program would read the four bytes that MPLAB generated for each instruction word. Tue Dec 03, If you are instantiating the BRAMs my preferred methodyou can loc them data2msm to a known position like this: Once that’s done, you can hardware the bmm file and not worry about it again.

Using Data2Mem in either manner, the patching of a design’s block RAMs prior to downloading is a great time saver.

11- Initializing Block RAMs using DATA2MEM

The following is the initial few lines from the MEM file I used: Tue Dec 03, 5: If I were Xilinx, I would have the placer perform this function instead dxta2mem the synthesizer; too much FPGA-specific knowledge in the synthesizer probably has a negative impact on its portability across multiple FPGA families. Make sure to produce.



Sat Jul 20, I don’t think this code is causing the errors I currently see. If later on you changed your software without changing your design you can use the last command to update the bit stream without having to repeat this long process.

org • View topic – Using Xilinx Data2MEM to Patch Block RAMs

There is likely a simpler way to get the netlist names for the block RAMs, but the above process was successfully applied. Therefore, I assigned three 4-bit bus lanes. Moreover, if you need to specify where your program fits in the memory you have to create your own linker file. Sometimes it’s a little more work, but it’s really not that much more, and you generally have to do it only once.

Now I see how it is organized, but I am confused as to why ngdbuild is completing with an error message: The post at the link gave a significant clue on how to determine the locations post-PAR of the block RAMs which will contain the program image. Floorplanner is good when learning the syntax of how to develop a proper text.


Moreover, the available Block RAMs in the target device should be kept in mind Synthesize the system and ensure that the correct number of Block RAMs has been inferred. By default it is blank. Sun Jul 21, 4: The change to a SSD made a large difference In other words, the MEM file format is bit-lane reversed from the memory initialization file.

Initializing Block RAMs using DATA2MEM – [email protected]

For the case you appear to describe, 8k x 8, there are several ways that the synthesizer may decide to implement the composite memory from four block RAMs: I’ll hopefully have spare time next week or so to try apply your results.

I haven’t read anywhere yet on how the synthesizer lays out the RAM. In this way, the issues I ran into regarding the construction of the MEM file should not be an issue.


My experience with ISE After several fruitless attempts. With this contortion made, I changed the baud rate constant and used Data2MEM to patch the bitstream by running Data2Mem from the command line: I suppose it would be wiser to assign 2 bits per BRAM using bitlanes and avoid muxing.