Hi Heystek Simulink has a maximum BRAM size of 64k (16 bits address size). A 32 bit address size would equate to 4G addresses, which is far larger than the amount of BRAM available in the FPGA.
Regards Andrew On Fri, Nov 26, 2021 at 3:40 PM Heystek Grobler <[email protected]> wrote: > Hey everyone. > > I have one last question regarding the BRAM. For my application I need an > address width of 32, but I get the error that the maximum allowable > address width is 16. Is there away around this problem or a way to get the > BRAM to use an address width of 32? > > Thanks for the help! > > Heystek > > On 25 Nov 2021, at 21:28, Dan Werthimer <[email protected]> wrote: > > > hi morag. > > thanks for helping everyone. > > best wishes, > > dan > > > > > On Thu, Nov 25, 2021 at 11:25 AM Morag Brown <[email protected]> wrote: > >> Happy to help :) >> >> On Thu, Nov 25, 2021 at 9:19 PM Heystek Grobler <[email protected]> >> wrote: >> >>> Hey Morag! >>> >>> Know I understand! >>> >>> It is working. >>> >>> <Screenshot 2021-11-25 at 21.18.00.png> >>> >>> Thank you so much for the help!!! >>> >>> Heystek >>> >>> On 25 Nov 2021, at 21:08, Morag Brown <[email protected]> wrote: >>> >>> Hi Heystek, >>> >>> Great! >>> >>> I think Jack mentioned in an earlier email that the maximum number that >>> can be represented by a <32,31> fixed point system is 1 - 2^-31. Reducing >>> the magnitude of your sinusoid so that the peak value is below this maximum >>> would work. Or alternatively, scaling your values by an amount less than >>> 2^31 would have the same effect. >>> >>> Morag >>> >>> On Thu, Nov 25, 2021 at 8:59 PM Heystek Grobler < >>> [email protected]> wrote: >>> >>>> Hey Morag >>>> >>>> That worked! >>>> >>>> When I read the packed sine wave from the BRAM, unpack it and plot it, >>>> I get this: >>>> >>>> <Screenshot 2021-11-25 at 20.56.16.png> >>>> >>>> I assume there is one data point that is causing problems at 1 or -1 >>>> that is overflowing? Any idea how I can fix that? >>>> >>>> Heystek >>>> >>>> On 25 Nov 2021, at 20:22, Morag Brown <[email protected]> wrote: >>>> >>>> Hi Heystek, >>>> >>>> You would need to increase the BRAM depth to one that can store all >>>> your data - currently, because the address width is 10, it can only store >>>> 2^10 (1024) points and you're trying to write 6020. So you would need to >>>> increase the address width to an appropriate size. >>>> >>>> Morag >>>> >>>> On Thu, Nov 25, 2021 at 8:05 PM Heystek Grobler < >>>> [email protected]> wrote: >>>> >>>>> Hey Morag >>>>> >>>>> The BRAM has an address width 10 and a data width of 32. >>>>> >>>>> Should I increase it? >>>>> >>>>> Heystek >>>>> >>>>> On 25 Nov 2021, at 19:52, Morag Brown <[email protected]> wrote: >>>>> >>>>> Hi Heystek, >>>>> >>>>> How big is the BRAM in your design? Does it have enough space to >>>>> accommodate the amount of data you're trying to write to it? >>>>> >>>>> Morag >>>>> >>>>> On Thu, Nov 25, 2021 at 6:59 PM Heystek Grobler < >>>>> [email protected]> wrote: >>>>> >>>>>> Hey Morag and Jack >>>>>> >>>>>> Thank you for the suggestions. >>>>>> >>>>>> I played around a little bit. if I create the sine wave the same as >>>>>> you Morag, then it works. I am able to write it to the bram, read it back >>>>>> from the bram, unpack it and get the same signal back. As soon as I use >>>>>> the >>>>>> sine wave that I require for my application, then it breaks again. >>>>>> >>>>>> Here is what I achieved using your sine wave Morag (ps iI changed my >>>>>> design to 32 bit): >>>>>> >>>>>> <Screenshot 2021-11-25 at 18.49.04.png> >>>>>> >>>>>> >>>>>> <Screenshot 2021-11-25 at 18.49.34.png> >>>>>> >>>>>> <Screenshot 2021-11-25 at 18.49.58.png> >>>>>> >>>>>> When I use my sign wave, then it does not work: >>>>>> >>>>>> <Screenshot 2021-11-25 at 18.55.45.png> >>>>>> >>>>>> <Screenshot 2021-11-25 at 18.56.02.png> >>>>>> >>>>>> <Screenshot 2021-11-25 at 18.56.14.png> >>>>>> >>>>>> <Screenshot 2021-11-25 at 18.56.43.png> >>>>>> >>>>>> The only thing that changed is the sine wave. is there something that >>>>>> I am missing? >>>>>> >>>>>> Thanks for the help! I really appreciate it! >>>>>> >>>>>> Heystek >>>>>> >>>>>> >>>>>> On 25 Nov 2021, at 14:57, Morag Brown <[email protected]> wrote: >>>>>> >>>>>> I think that's because the functions used in both *In[15]* and >>>>>> *In[16]* do the same thing. See the screenshots below to see what I >>>>>> mean. So you construct the raw bytes data in *In[15]* and then try >>>>>> to pack that as an integer in *In]16}*, which won't work because >>>>>> *struct.pack('>i',A_y) *expects data of type *int* while you're >>>>>> actually giving it data of type bytes. To pack the data using >>>>>> *struct.pack()* you would need to pass it an *int* (or array of >>>>>> *ints* and tell it how many points you're packing). I think (someone >>>>>> please correct me if I'm wrong) that you only need to do one or the other >>>>>> to get the correct raw data to be written to BRAM. >>>>>> >>>>>> <Screenshot from 2021-11-25 14-55-29.png> >>>>>> <Screenshot from 2021-11-25 14-55-39.png> >>>>>> >>>>>> I also see you're scaling up by 2^31, but I think your BRAM is data >>>>>> width is 16 bits, so you'd likely want to scale by 2^15? >>>>>> >>>>>> Morag >>>>>> >>>>>> On Thu, Nov 25, 2021 at 12:46 PM Heystek Grobler < >>>>>> [email protected]> wrote: >>>>>> >>>>>>> Hey Jack and Morag >>>>>>> >>>>>>> thank you for the advice and help! i am still getting errors and is >>>>>>> stuck. Below is the new errors: >>>>>>> >>>>>>> <Screenshot 2021-11-25 at 12.41.43.png> >>>>>>> >>>>>>> <Screenshot 2021-11-25 at 12.42.53.png> >>>>>>> >>>>>>> I have also attached the new script I am working on. >>>>>>> >>>>>>> Could it be that I am generating the sine wave incorrectly? I have >>>>>>> about 600 000 000 points that I am working with. >>>>>>> >>>>>>> I keep getting “cannot convert argument to integer when running >>>>>>> struct.pack. >>>>>>> >>>>>>> Thanks for the help! >>>>>>> >>>>>>> Heystek >>>>>>> >>>>>>> >>>>>>> On 23 Nov 2021, at 14:31, Jack Hickish <[email protected]> >>>>>>> wrote: >>>>>>> >>>>>>> Hi Heystek, >>>>>>> >>>>>>> Assuming your BRAM is set for 32-bit wide, you probably want to be >>>>>>> writing the values with 31 bits below the binary point -- i.e. >>>>>>> normalized >>>>>>> to the range [-1, 1) (aka simulink FIx32_31). In this case the packed >>>>>>> values would be: >>>>>>> >>>>>>> struct.pack('>i', int(floating_point_sine_value * 2**31)) >>>>>>> >>>>>>> Though, be careful, because +1.0 isn't included in this number >>>>>>> representation (the maximum is 1 - 2**-31) , so you might want to >>>>>>> include >>>>>>> some saturation logic (or scale up by a value less than 2**31). >>>>>>> >>>>>>> For what it's worth, you can pack an entire numpy array with: >>>>>>> floating_point_numpy_array.astype('>i').tobytes() >>>>>>> ,which saves looping and appending to a binary string. >>>>>>> >>>>>>> Does that help? >>>>>>> >>>>>>> Cheers >>>>>>> Jack >>>>>>> >>>>>>> On Mon, 22 Nov 2021 at 18:10, Heystek Grobler < >>>>>>> [email protected]> wrote: >>>>>>> >>>>>>>> Hey Jack >>>>>>>> >>>>>>>> I am also well thank you. We are starting to go back to the >>>>>>>> observatory (HartRAO) again. >>>>>>>> >>>>>>>> Here is a snippets of the python code that I am using as well as >>>>>>>> my simulink design: >>>>>>>> >>>>>>>> The first nipped is where I create the sine wave: >>>>>>>> >>>>>>>> The second snipped is where I plot the sine wave: >>>>>>>> >>>>>>>> >>>>>>>> The third snipped is where I pack the sine wave array: >>>>>>>> >>>>>>>> >>>>>>>> The fourth snipped is where I write the packed data to the BRAM: >>>>>>>> >>>>>>>> >>>>>>>> Snipped 5 is where I want to use the sine wave and cosine wave: >>>>>>>> >>>>>>>> >>>>>>>> But to check that it is working, I have created the simple design >>>>>>>> in snipped 6: >>>>>>>> >>>>>>>> >>>>>>>> I have also attached my simulink design and python script. >>>>>>>> >>>>>>>> Thank you for the help! >>>>>>>> >>>>>>>> Heystek >>>>>>>> >>>>>>>> >>>>>>>> On 22 Nov 2021, at 18:55, Jack Hickish <[email protected]> >>>>>>>> wrote: >>>>>>>> >>>>>>>> Hi Heystek, >>>>>>>> >>>>>>>> All good here (in London), Thanks. Hope things are going ok with >>>>>>>> you too! >>>>>>>> >>>>>>>> I've taken this back on list for the benefit of others. Do you have: >>>>>>>> >>>>>>>> a) a snippet of some python code which you're using at the moment >>>>>>>> b) A Simulink snippet of the BRAM you're trying to write to, >>>>>>>> indicating how the bram is configured and how its data are being used? >>>>>>>> >>>>>>>> Cheers >>>>>>>> Jack >>>>>>>> >>>>>>>> On Mon, 22 Nov 2021 at 16:52, Heystek Grobler < >>>>>>>> [email protected]> wrote: >>>>>>>> >>>>>>>>> Hey Jack >>>>>>>>> >>>>>>>>> How are you? It has been a while since we last spoke. >>>>>>>>> >>>>>>>>> I am really struggling to pack data into binary format for my >>>>>>>>> design. I was wondering if you have time if you can please help me >>>>>>>>> with it. >>>>>>>>> I have no clue if what i am doing is correct and there is no one >>>>>>>>> around me >>>>>>>>> with the knowledge to help me. >>>>>>>>> >>>>>>>>> All that I want to do is too pack a sine wave that I already >>>>>>>>> generated, and write it to a BRAM. >>>>>>>>> >>>>>>>>> I hope to hear from you soon! >>>>>>>>> >>>>>>>>> Heystek >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> -- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "[email protected]" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>> send an email to [email protected]. >>>>>>> To view this discussion on the web visit >>>>>>> https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/8791F6EA-204B-4BCC-B0DC-3CAD3D928A05%40gmail.com >>>>>>> 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