USB 1.1/2.0 Implementation

if you dont say what your problem is how could one help? the USB cores available are working out of box for Xilinx, for altera you need to change the technology dependant portions and it should again work.

antti

Altera

progress

towards a

Hi Antti Thanks for the response. I actually contacted you regarding USB page that you mentioned in this newsgroup a while back (Japanese language). Ok firstly regarding USB implementation, the way I see it, there are 3 major parts, which are:

1. USB Transceiver (to connect the FPGA and the PC)
2. FPGA Implementation
3. Windows App

Now

1. USB Transceiver - I have found out that the Philips PDIUSBP11A is quite suitable for this job. However if you look at this pdf (which shows the circuit connection)
   formatting link
   applicationnotes/AN10007-01.pdf , on page 5 of this pdf there are 2 circuit diagrams. I'm not able to understand the difference between upstream and downstream circuits. Pls help/advice.
2. FPGA Implementation - Antti, you replyed saying (for altera you need to change the technology dependant portions and it should again work.). What do you mean by this? Help Again. Where can I download the USB cores to begin with? Once I can get hold of the USB core, I guess I'll have a starting point.
3. Windows Implementation - I have no clue with regards to windows drivers. Any help in this matter would be very greatful.

Thanks guys

I have not looked at the circuits, but upstream is closer to the PC and so is a "host" type connection while downstream is closer to (or is) the peripheral. I think there are only very small differences having to do with initialization protocol.

I think he was saying that he is aware of IP that works in the Xilinx chips and so would work in any other FPGA. But the coding style may have used chip specific features (like the 16 bit SRL in the Xilinx parts). If so, this code may need to be changed to something more generic for an Altera part. Any Xilinx features that are instantiated will need to be replaced for sure.

Check

This depends on your application. I believe there is a generic set of drivers to support a "human interface device" or similar which means it works like a mouse or keyboard in terms of sending data in small packets.

Again, I am not directly experienced with this, but I have been listening intently when others discuss this here and elsewhere.

that

major

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circuit

Thanks for the clarification.

to

What do

begin

Err.. I found this usb_phy from opencores.org however I'm struggling with that. The main top layer file has so many I/O's compared to the I/Os of the PDIUSBP11A, i'm stuck. I'm stuck in the sense that I do not know which pin will map which one on the transcevier.

drivers.

Sigh.. I guess I'll join you ..

Thanks for your input.

USB11T11A FS/LS USB tranceiver

usb_phy (opencores) UTMI interface that connects to USB11T11A

usb1.1 (opencores) connects to usb_phy (opencores) connects to USB11T1A it is not HID but it will enumerate in hardware iw the USB host will 'see' it, but ther is no host software provide

usb (japanase desing) full HID USB core includes USB11T1A model) can directly be connected to usb D+ D- pins! (no tranceiver chip), there is some VB test program to talk to the core (as it is HID peripheral)

antti PS I am afraid you have todo some homework :) cant do it for you

Hi Antti Thanks for the response. haha. I don't expect anyone to do work for me, othwersie I won't learn anything, but I wouldn't mind some guidance along the way from you guys.. Anyway I need to ask 2 questions regarding your reply.

1. When you say USB11T11A, do you mean the Philips tranceiver PDIUSBP11A? If no then I'm sorry but i'm not able to find anything on USB11T11A. Have I gone blind?
2. Regarding the usb (japanese design), I have ended up towards a brick wall. What I mean to say is, I have been looking at the design for couple of hours and there are 4 components that I'm not sure what they do. The main problem is that the code was written for a Xilinx component and because I'm using Altera component, I'm do not have the librabires that these component are using. Firstly the library defined is (which is for Xilinx only (pls correct me if i'm wrong)) library unisim; use unisim.vcomponents.all;

and the 4 components that are using this library are u_DLL : CLKDLL port map ( CLKIN => CLKINM, CLKFB => GCLK, RST => RST, CLK0 => GCLKM, CLK2X => CLKM, LOCKED => LOCK );

u_GCLK : BUFG port map ( I => GCLKM, O => GCLK );

u_CLK : BUFG port map ( I => CLKM, O => CLK );

u_CLKIN : IBUFG port map ( I => CLKIN, O => CLKINM );

If you can explain me how I can replace these components for Altera design, I will have a step to progress. If I can get past this point, then I have something to try on the chip and play around. My problem is that right now I can't go past compiling as Quartus doesn't recognize these components (or the library). Pls Advice

Thanks again

Regards

This is something I know a bit more about. These are all clock components. CLKDLL is a DLL (Delay Locked Loop) like a PLL only more Xilinx like ;) The Altera parts have PLLs depending on the part. I don't know if this is required or just used to allow different external and internal clock rates.

The BUFG and IBUFG are just clock buffers. They are used to drive the internal clock distribution networks. Altera should have equivalent components or you may not need to instantiate them since they are typically locked to a given pin and should be inferred by most tools. Read up a bit on the Xilinx and Altera chips and this will all be very clear.

Hi SneakerNet,

I just noticed we have VERY handy application note for you -- AN307 (available on

In Altera's FPGAs, we've got PLLs, which provide a superset of the CLKDLL function you're trying to use. You'd want to setup your PLL to use CLKIN as its input inclk0, hook up the C0 port to GCLK signal and C1 port to CLK signal, don't apply any phase shift, and use the C0 port to compensate the PLL output. Connect RST to the areset port, and LOCKED to the locked port. You'll want to setup your C1 port to have a 2x frequency multiplier on it. The Lock and Reset signals have some sort of equivalent that I can't recall. You can do this all through the allpll megafunction.

The BUFGs are not necessary in Altera parts. In Xilinx parts, these buffers are needed to explicitly indicate that you want a signal to be driven onto the global clock network. Quartus allows you to make "global" assignments to nets, but it automatically promotes anything it finds that looks like a clock net, as well as high-fanout or asynchronous signals if there are enough global clocks available. The PLL output nets will be automatically promoted to global clock nets for you, and the PLL input will be assigned to the associated input clock pin.

Also, I should point out that there are four USB cores listed on our Intellectual Property page

Regards,

Paul Leventis Altera Corp.

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Hello again Paul ;o)

LOL, tell you what, I already cracked it. I found that document sometime back now *grins*. And I also cracked that the CLKDLL is just a pll *grins again* and thus I had posted another msg (which you have already replied before) but once again I beat you to it. I cracked it before you replied ;o).

Anyway thanks for taking time in explaning the Xilinx components. Regarding the free USB Cores from Altera website. Service I would give umm 10% *no offence*. I had to log into that page and request the core nearly 10 times before someone contacted me from Altera. Then after 2-3 days they told me that USB 2.0 core is not functional so i asked for usb 1.1 core. Then they asked me hundreds of questions of why/what for/how long etc etc. When I finally got it, it was only licenced for a month (which passes by just like that as I'm working on this USB project part time. Anyway I found a site that had the full VHDL USB core free of cost (without any need for any hardware). I'm stuck at the windows driver now. Rest is all ready to go..

Any help on how to install a generic usb driver?

Thanks for your response Paul. Bye

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Hi,

Well, serves me right for going away... all my posts are for naught :-)

One small correction: DLLs are *not* PLLs -- though their first-order behaviour seems similar. They are fundamentally different approaches to solving the same problem. DLLs pass an input clock through a programmable delay chain, and adjusts delay until the edges of the output clock and input clock align. PLLs synthesize a clock via a VCO and phase shift the resulting clock relative to the input clock. This means high-frequency jitter on the input is filtered out in a PLL, but transmitted in a DLL. PLLs usually have better clock frequency synthesis options, as they can include multiply/divide counters in their feedback loop; DLLs can provide some such capabilities via digital hardware, but it is very limited. There are other differences between the two in how they respond to low- and high-frequency jitter/drift, their noise susceptibility, range of operation in input/output frequencies, granularity of phase/frequency adjustment, response to temperature/voltage variation, and numerous other areas that I can't recall precisely. Which is better depends on your application, though generally speaking PLLs provide a more versatile solution.

Obviously we at Altera feel that PLLs are the better choice for our users, as this is what we have chosen to build on all of our devices since APEX. Stratix includes up to 12 PLLs of various flavours.

I can't help you on the device driver front.

I'll pass on your comes re: usb core availability and your experience with the web to the appropriate groups.

Regards,

Paul Leventis Altera Corp.

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Hey Sneaker,

I can't give you the code to our host side driver (I don't own it) but I can tell you its a slight modification to a sample driver in the MicroSoft Device Driver Kit.

From the original header. (So you could search)

Copyright (c) 1995 Microsoft Corporation Module Name: I82930.c Abstract: USB device driver for Intel 82930 USB test board Environment: kernel mode only

So if you have access to or can get the MS DDK then I think it has all you need. Our setup was pretty much done for us, but you need to compile this driver with a unique filename and maybe your USB ID (not sure about this) and then you setup a .inf file that says your device uses this driver file. (executable renamed to SneakersUSB.SYS or such)

"your device" is the name that should show up even without a driver when you plug it into a Windows box. I assume the USB core has some default. (.inf file basically maps this name to which driver to load. May be able to use someone elses driver by creating a .inf for all I know)

Surprised they gave away the core, but not the driver they tested it with.

Good Luck! Ken

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Hi Ken

Thanks for the important tip. I'll give that a shot. (so there is no way u can send me driver? all i need is a driver with vendor id = 0c91 and product id = 2001). Anyway like u mentioned, very big pity that the guys didn't include drivers and they gave their whole vhdl code free. Pity!

Hope god has mercy on my soul while i'm doing usb driver.. LOL Thanks Ken Kind Regards

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LOL Thanks Paul All help appreciated at this stage..

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So, when you plugin your device, does Windows say New Device Found, etc.? Giving you a chance to install a driver? If so, does it tell you the name of the device?

I"ve never built our driver, but I'll give it the ol' 15 minute try.

Ken

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Hi Ken Ok when i plug in the cable, windows reports a usb device is found, but because win doesn' know what it is, it fails. I have attached a screenshot (Sample.jpg, sorry about the attachment but I don't have web space to upload on a site).

Now someone also mentioned to use Jongo WinDriver which I'm trying to use it. Firstly have u used this program your self. If you haven't used it then reject the next line. Secondly, this program allows you to generate a custom inf file (with product and vendor id), which I do but when it comes to installing the new custom driver, win2k doesn't like it and instead uses the c:\winnt\inf\usb.inf file. This sucks.

Do you know what 'multi-interface device' means? Cheers Ken Regards

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Hey,

Sorry, my cheapy supernews account doesn't support attachments or .jpgs. (text only)

The Jongo stuff sounds cool if it would work. I'm not going to be able to rebuild our driver for awhile. I'll have to find the machine at work that has the DDK installed. (My machine doesn't)

Interestingly our vendor/device id's don't exist in the driver source, only the driver name.

Is Jongo free? Sounds interesting. I was wondering why there isn't a generice bulk interface driver in Windows that you could use to talk to any USB device. I'm wondering if its not possible. If our vendor/device id's are only in our .inf file then that would mean anyone could map their device to use an existing driver just by editting the .inf file.

As you may guess, I wasn't the guy who originally built our sample Netchip driver many years ago. (I was the guy who got the registered ID's in the first place) I know it was easy and it works great. I'll update you if I make any more progress.

Ken

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Hi Ken The Jongo windriver is free for 30 days, but a quick hunt on

The program does sound very cool, excpect I can't get it to work *sniff*. You are right about the ID's. I suspect the .sys and .dll files prob have the ID's as well in it. Then again I'm no guru at windows driver.. aaargghh .. why does this have to be so unfriendly.. any more help pls pls drop in a line

Regards

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You might look for a book by the title (I think) "UBS made easy" or something like that. My copy must be packed away. It had a lot of info on Windows drivers and included several VB examples on the CD. If I can find the book I'll post the ISBN but I remember I got it from Amazon.