Serial Peripheral Interface || SPI PROTOCOL || explanation with Verilog code and Testbench
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- เผยแพร่เมื่อ 7 ก.พ. 2025
- Serial Peripheral Interface || SPI PROTOCOL || explanation with Verilog code and Testbench
This tutorial explains all about the most famous low end SPI Protocol in details.
It's a 4 wire protocol used in consumer electronics.
I have explained the SPI Protocol with realtime example.
You also learn the advantage and disadvantage of this protocol.
I have also provided the working verilog code with testbench so that you all can be able to write your own spi Protocol code.
Thanks.
My mail id - email2vesystem@gmail.com
Please, don't send me mail asking for content(PPT,PDF) or any verilog code. For any other help you are most welcome.
#componentbyte
Best channel for VLSI people. Thank you very much sir for delivering wonderful knowledge
Thank you for your appreciation. Happy learning.
@@ComponentByte Sir can you please make a video for AXI protocol if that is convenient to you?
Hi, I have never worked on AXI protocol but once tried with AXI Bus IP available in XILINX which any one can use if they have access to paid version (AXI IP is easy to use). So it will be difficult for me to make a content on AXI. sorry.
excellent tutorial. Thank you very much.
Really amazing teaching methodology.....thank you so much for such nice videos
Thank you for your appreciation.
@@ComponentByte welcome
Sir ur teachings are soooo help full
Thank you for your appreciation. Wish you a Happy learning.
the way you explain is very easy to understand, thank you for your sharing. Could you please help me a question is that what is the difference between transmitting MSB bit first and transmitting LSB bit first?
Sir Amazing lecture 👏 tqsm..
Keep the good work 💪
Thank you.
First of all, thank you very much for your explanation. At around 3:15 of the video, I think there should be a problem with your conceptual understanding of Master and Slave. The Master should be the device that generates the clock SCLK, and the Slave is passively driven by the clock.
You are absolutely correct. Master generates clock and slave is driven by it. I believe I have definitely talked about it in my SPI videos. At 3:15 , what it refers is Master is the one who initiates data transfer and not slave.
Thank you very much for your valuable comments.
Everything is very clearly explain .Thank You !Can you do the video communication between microcontroller and FPGA example and may i have github link?
The title is Verilog project-Hardware Interfacing, but just the theories of operation of SPI, VGA, and so forth), nothing about an actual HW. It would be really nice if you could update at least to Spartan7 (or even Artix7) and implement them on some HW like Basys3. Basys3 has been around for a long time (today is May 5, 2024).
it is very useful, please do videos on other protocols like APB, AXI, I2C and please provide the code in the description. keep doing this kind of videos...
Thank you. Next tutorial will be real hardware interfacing using SPI protocols, then LCD ,VGA interfacing and then I2C interfacing.Thanks.
@componentbyteHello sir...by now is your playlist of spi protocol ..now fully complete along with explanation of code ??????
@@ComponentByte sir by now is your spi protocol playlist complete ????
Nice explination sir
Thank you.
Thanks sir plz continue this
Keep learning.
Wow 🎉
Tq so much sir
Thank you for sharing
You are welcome. In the next tutorial I will explain how to interface real hardware with FPGA and how to make it work with Verilog code.
excellent tutorial. could you please guide me how I can implement it on fpga vivado ,for DAC implementation
Please find the datasheet of your fpga board and then check the DAC part. Then you need the timing diagram of your DAC chip. Next, understand the timing diagram and write the code the same way I have written. I was very new when I had first written the code for it.Thanks
During simulation i gave input 1 to clk ,0 to reset and a569 to datain it takes,but the spi_cs,sclk,data can't take St0,St1,St1 it shows error what i do.... please explain😢
👌👌👌👌👌👌
Can u also teach Protocols like AXI4, AHB, APB and Basics of PCIe and Avalon
I have not worked on these protocol. I have a little knowledge on the said topic.
If am going to connect more than one slave on the SPI Will i be able to communicate to all the slave devices at the same time else only one device be activated through the chip select line
If master supports separate chip select line for each slaves then definitely one can communicate to all slaves at the same time. It's possible. If master has only one chip select line then also possible but with exatra efforts and this is called daisy chain in SPI .
Thanks.
@@ComponentByte Thanks a lot for your valuable time and effort on answering the query on a quick time
Do i need FPGA Board to verify the code or i can directly verify in xilinx ?
Now , you don't need FPGA board. Write testbench , give some random inputs and check your result and validate MOSI,MISO line and clock signals.
If you will be testing real spi hardware like the one I have explained in ADC-SPI tutorial then you need FPGA board
Okay sir !! Thank You so much! @@ComponentByte
why MOSI variable is initialized as array (in design code)? can we initialize it as single bit variable?
You have mentioned MOSI variable, so here MOSI is a reg variable and not the SPI_MOSI line.
reg [15:0]MOSI is a shift register to store the 16 bit data.
But the actual SPI_MOSI line here is 1 bit spi_data and this is the output line and it cannot store data so declared as WIRE(so we can't initialize)
output wire spi_data;
At the end the [15:0]MOSI data is assigned to spi_data this way
assign spi_data= MOSI
Here whenever any bit is stored in MOSI register it's transferred to spi_data line.
Hope it helps.
Want to ask one thing. How to learn these protocols on our own ? I want to learn PCI protocol. What is the best source ?
The best source is always the datasheet or document designed by the owner of PCI. PCI belongs to intel if i remember. so download PCI interface datasheet from internet. Read it. It will take some time to understand.its also not easy but not difficult also. There are many sources available on internet.
unless someone try interfacing with real hardware one cannot learn it. Learning protocols and implementing it on real hardware are the best way to learn.
Few VLSI training centre provides protocols training.
Thanks.
Visit the given link
opencores.org
@@ComponentByte I have gone through opencores site. I think training on the job can only provide a thorough learning.
To my knowledge, companies provide the document only(if possible the already written code also) and ask you to go through it. No one will teach how it works.
@@ComponentByte that's painful :(
Any plans for AMBA Protocol?
Most probably NO, sorry.
Thanks for the tutorial sir. Can you plz share the code. It will be really helpful.
You are welcome.
I have already provided the code. please write your own code and you will understand in better way.
If you need any help to understand the code then please let me know and I will try my best to make you understand.Thanks.
@component byte ..sir can basically Can u share codes..but most importantly during interviews we should have understanding of it ..so how we collectively e plain this spi ...like theory anyone can tell even who haven't implemented project then what's the difference like ...what matters ..???...do you have any videos regarding tht explanation
Provide me your e-mail id and I will send the code.
As a fresher, knowledge of SPI protocol functioning is enough but they can ask you different aspects of the work you have done.
They might ask about the frequency of operation of operation. They can ask if FPGA Freq is 50mhz then how did you manage to work with SPI as spi Freq of operation is different.
Why spi is used?
Real time application of SPI ?
Did you miss the data while reading the data, if yes, how did you manage ?
Advantage of SPI over other low end protocol? It's disadvantage also ?
Many questions can be framed.
If someone has really understood and done the project he or she will be able to answer the above questions.
sir what about MISO
Miso is master in and slave out
It's used when you are expecting to read data from a spi device. But in our case we have not attached any SPI device so we are not using SPI MISO pin as we are not reading any data from spi device.
I have used this pin in my other spi tutorial like ADC, RF module interfacing because we are reading data from these spi device.
You define MOSI a 16-bit vector and in your code you are using this which is wrong MOSI
If you assign less width signal to more width signal then zero(O) is added in the MSB side.
in= 1'b1
out( 16 bit )
Teaching is good, but try to keep it short.
Yes, all the videos are long. I accept it. There are various reasons for this.
One of the reason is when I explain something I treat everyone equal means I try to explain things from very basic and I believe I am teaching to someone who knows nothing about the topic or had no previous knowledge , so I keep repeating things . Even I forget that I am making videos for TH-cam because I never get satisfied till I explain each and everything. I love teaching.
Another reason is as I m trying to explain things in English language which I am not very good at, so it is taking extra time to explain but still I have tried my best.
So please keep patience while watching.
Thank you
Are you going to cover Clock Polarity and Phase (CPOL and CPHA) variations on the SPI protocol?
en.wikipedia.org/wiki/Serial_Peripheral_Interface
If it's required then I will try to cover.
The code is not working what you tell
Please check if anything is missing. Hope I have not done any mistake while copy and pasted the code from my system else it must work.Thanks.
Sir ,How can I reach you ?
May I know, how can I help you.
Sir can you provide your linkedin profile I have doubts in it
If you want you can ask your doubt here. I will try my best to explain.Thanks.
@@ComponentByte
1. Why you have taken sclk differently not as normal clock?
2. This is only master right?
3. We should also implement slave?
After implementing both how can we both merge together
Here clk = Default FPGA clk= 50Mhz
But SPI bus speed is very slow so it won't work with 50Mhz clk. So as per spi Protocol document SPICLK minimum time period is 20ns and max is 10000ns.This time period we have to maintain to make it work. So SPICLK has to be different.
Yes, it's master only. Because I have not used any external slave device,so it's just master(FPGA) communication.if any device which supports spi protocol is interfaced with FPGA then we need to code for both master and slave.
The code I have provided is to show how spi can be coded and not the actual real interfacing with slave.
In my text tutorial I will explain how master and slave communicates with the real hardware interfacing . All your doubts will be cleared.
Hope you understood.
Thanks.
@@ComponentByte sir,
My lecturer asked to implement both master and slave also
One more thing is that after sending one bit from master we should also receive one bit from slave right?
So, after designing both
Should I need to integrate both in another seperate module
When we send 1 bit from master we get 1 bit from slave. This is not true. Slave responds to master. Master sends data and slave may not return anything. Master slaves 1 bit and slave may send 8/16/32 bit data.
We don't write different module for master and slaves.
Please wait for few more days. I will upload complete master slave verilog code with real hardware interfacing. All your doubt will be cleared.Thanks.