Hi, I try to implement a VHDL code as custom user HDL. The component that i need to release is an algorithme that determine the five greatest value for 16 input in one clock cycle. I compile this project with modelsim it wok fine and i synthesize it through quartus II. Now i try to integrate it with my design through SOPC builder. I add it as a new component as illustrate on the attached file. My question is how can i acces to each input or output for my design. For example i need to write a value on input 0. And read this value on max1 output. Please help me.:(

--- Quote Start --- I try to implement a VHDL code as custom user HDL. The component that i need to release is an algorithme that determine the five greatest value for 16 input in one clock cycle. I compile this project with modelsim it wok fine and i synthesize it through quartus II. Now i try to integrate it with my design through SOPC builder. I add it as a new component as illustrate on the attached file. My question is how can i acces to each input or output for my design. For example i need to write a value on input 0. And read this value on max1 output. Please help me.:( --- Quote End --- Your image is unreadable. Have you actually designed this component as an SOPC Component? i.e., does it have an Avalon-MM slave interface to write the values and then enable the calculation of the five largest values. What is the point of this algorithm? How many bits do each value have? Where do these samples come from? Rather than calculate the five highest values, I think keeping the five highest values are you write would be more efficient, i.e., the Avalon-MM slave keeps the five largest values written to it, regardless of how many values are written. That way you can DMA a block of data to a single memory location, and then go and read the five greatest values. Cheers, Dave

--- Quote Start --- Your image is unreadable. Have you actually designed this component as an SOPC Component? i.e., does it have an Avalon-MM slave interface to write the values and then enable the calculation of the five largest values. What is the point of this algorithm? How many bits do each value have? Where do these samples come from? Rather than calculate the five highest values, I think keeping the five highest values are you write would be more efficient, i.e., the Avalon-MM slave keeps the five largest values written to it, regardless of how many values are written. That way you can DMA a block of data to a single memory location, and then go and read the five greatest values. Cheers, Dave --- Quote End --- Hi thank you for your reply, I synthetize my design through quartus II, and on the SOPC builder i add a new component and i call my HDL design. After this he appear to me the next window witch i will relate the signal of my design to tha avalon interface. I am not sur about the link that i make because it appear to me some warning. My design have 16 input value coding in 16 bits. In reality it come from the RAM through the Nios II processor. If it is possible to relate my design directly with RAM it will be very good, beacuse i don't have any idea that's possible or no. On my application i need to get the five greatest value of the first 16 memory value. Every time i will make the same think but on the next 16 value. I hope that it is clear. Actually i just sysnthetize my design and i'am blocked on this step. How should i connect the input to the vavlon, because as i mentionned above, i am not sur about the link that i make this is first. Second after i connect my custom instruction to the niosII, how i know the adress of every input and output. Thank you

--- Quote Start --- I synthetize my design through quartus II, and on the SOPC builder i add a new component and i call my HDL design. After this he appear to me the next window witch i will relate the signal of my design to tha avalon interface. I am not sur about the link that i make because it appear to me some warning. My design have 16 input value coding in 16 bits. In reality it come from the RAM through the Nios II processor. If it is possible to relate my design directly with RAM it will be very good, beacuse i don't have any idea that's possible or no. On my application i need to get the five greatest value of the first 16 memory value. Every time i will make the same think but on the next 16 value. I hope that it is clear. Actually i just sysnthetize my design and i'am blocked on this step. How should i connect the input to the vavlon, because as i mentionned above, i am not sur about the link that i make this is first. Second after i connect my custom instruction to the niosII, how i know the adress of every input and output. --- Quote End --- All of these statements are very confusing. You are indicating you are using lots of features of Quartus, eg., SOPC components and custom NIOS II instructions, yet none of your explanations make sense. I fear you do not understand any of them. Why don't you start out by explaining exactly what you are supposed to implement, as well as the constraints on what type of logic you are allowed to do, eg., Project: Determine the five greatest values from 16 input values Implementation: a) In pure HDL, with the result valid in one clock b) In pure HDL, with the result valid in multiple clocks c) Using a NIOS II processor and software, with data in FPGA RAM d) Using a NIOS II processor using a custom instruction If you get to choose the implementation, then start with the simplest, i.e., the software solution (c). Start by writing the code on your desktop computer. Then work on other versions of the code. Cheers, Dave

--- Quote Start --- All of these statements are very confusing. You are indicating you are using lots of features of Quartus, eg., SOPC components and custom NIOS II instructions, yet none of your explanations make sense. I fear you do not understand any of them. Why don't you start out by explaining exactly what you are supposed to implement, as well as the constraints on what type of logic you are allowed to do, eg., Project: Determine the five greatest values from 16 input values Implementation: a) In pure HDL, with the result valid in one clock b) In pure HDL, with the result valid in multiple clocks c) Using a NIOS II processor and software, with data in FPGA RAM d) Using a NIOS II processor using a custom instruction If you get to choose the implementation, then start with the simplest, i.e., the software solution (c). Start by writing the code on your desktop computer. Then work on other versions of the code. Cheers, Dave --- Quote End --- I'am so sorry, for my explanation. Yes Dave, i confuse between custom instruction and SOPC Component. At first i belive they were the same, if you can that you give me the difference between it. When can i use custon instruction and when i use SOPC component. I will try to explain what i suppose to implement. I have PRC algorithm that contain 16 bloc of SBC( mentionned on the attached file). It mean that i need 16 SBC bloc work en parallel. 1- the result of this algorithm it valid on two clock cycle. 2- For me i search if i can implement it "Using a NIOS II processor using a custom instruction", if it is possible ok, else i implement it '"Using a NIOS II processor and software, with data in FPGA RAM". I use this solution because i implement it using c, but it give a big execution time, about 18 microseond. Om my project i have a real time contraint, and my project should be execute on 0.5 microsecond. I hope that is clear. Thank you very much.

--- Quote Start --- i confuse between custom instruction and SOPC Component. At first i belive they were the same, if you can that you give me the difference between it. When can i use custon instruction and when i use SOPC component. --- Quote End --- A custom instruction is something that can be inserted into the NIOS II processor pipeline. An SOPC Component is a memory-mapped component that a NIOS II processor can access. When you need to use one or the other is application dependent. An example of a custom instruction would be a multiply operation, and an example of a custom component would be a checksum accelerator. --- Quote Start --- I will try to explain what i suppose to implement. I have PRC algorithm that contain 16 bloc of SBC( mentionned on the attached file). --- Quote End --- The attached file is meaningless without a timing diagram that shows the waveforms used to control this block. This is a good start, but it does not help explaining what you are trying to do. --- Quote Start --- 1- the result of this algorithm it valid on two clock cycle. 2- For me i search if i can implement it "Using a NIOS II processor using a custom instruction", if it is possible ok, else i implement it '"Using a NIOS II processor and software, with data in FPGA RAM". I use this solution because i implement it using c, but it give a big execution time, about 18 microseond. Om my project i have a real time contraint, and my project should be execute on 0.5 microsecond. --- Quote End --- So what is the timing requirement; finish in two clocks, or finish in 0.5us? If its finish in 0.5us, then at 100MHz, this is 50 clocks. If the data that you are finding the highest five values in is continuously streaming into your FPGA, then the highest five values can be read at any time, and they will represent the five highest values that have come in so far. The search algorithm is not the only important part of the design; where the data comes from is just as important. Try to draw a block diagram of the system design first, and then look at the implementation of each of the components. Cheers, Dave

Question about Custom User HDL | Altera Community

12 Replies

Altera_Forum
Honored Contributor
14 years ago
Thank you for your reply et for this clarification,

--- Quote Start ---
Dude make a HDL block with inputs and outputs and your logic.
--- Quote End ---

I synthetize my HDL block and it work fine.

--- Quote Start ---
Then integrate it in your SOPC connecting the inputs(data, clock, reset) and outputs(5 highest numbers, maybe a valid signal?) in their respective signals. (take a look at the AVALON INTERFACE/SOPC user guide to see the correct name of the signals).
--- Quote End ---

And i read AVALON INTERFACE/SOPC "http://www.altera.com/literature/ug/ug_sopc_builder.pdf" but i don't arrived to understand it because isn't simple. If it is possible that you give me a small information or to clarify this. If isn't possible, can your reply to me for the following question:
1- I use avalon memory mapped slave, when i relate each input and output for the following connect i get these two message:
warning: avalon_slave_0: signal read data appears 4 times(only once is allowed)
error: avalon_slave_0 has write interface but no witre control.
what can i do with this message.

--- Quote Start ---
However the calculus won't be done in one clock cycle, it will take X clock cycles + X clock cycle to perform a read in the NIOS2 (i think the total clock cycle number will be small enough for you.. it will probably take 5~10 clock cycles)
--- Quote End ---

Thank yoy for this inofrmation.
Altera_Forum
Honored Contributor
14 years ago
You can only have one read data signal, use the adress signal to multiplex multiples data that you want to read
you select a signal as a write interface but you didnt do any control on it

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