[sdiy] Avnet Spartan-3A Dev Board - USB-UART Bridge Info

[Csaba Zvekan]

On Dec 18, 2008, at 3:09 PM, Scott Gravenhorst wrote:

> Csaba Zvekan <czvekan at gmail.com> wrote:
>> Thanks Scott for the info,
>>
>> Do you have some updated pages or notes we can print out . So we can
>> attach it to the User guides pdf or something.
>> I guess I could print out this mail , right :)  hmmm ok.
>
> That works.  I was frustrated waiting for the PIC board for my  
> infrared project, so I
> started developing on the Avnet board just to get it working.  I  
> read through the docs
> and it looked easy to get serial data in/out via USB through the  
> UART bridge - but it
> wouldn't work!  As you know, I'm making a single bit sampler and I  
> needed to resample
> all the buttons at a slower sample rate, but I needed to get the  
> data into my
> workstation.  Finally, I found some posts on the Avnet forum for the  
> board and others
> had discovered the reversed pins.  I discovered the bad pin labeling  
> myself, ISE
> complained about pin P22 not existing and refused to compile.  Then  
> I went to the
> schematic which showed A3 and B3 for the pins, but they were  
> reversed.  I figured it
> was another error in the docs, so I looked at the forum where I  
> found out about the
> reversed pins.  Once I fixed that, it worked like a champ, no setup  
> or config, it seems
> automagically capable of 115.2 Kbaud...
All right , Scott . Let us/me know how you ported your project to the  
PIC-board . And how it turned out . We hope you can record your  
digitally broadcasted TV-series without any hassle pretty soon. :)
I don't mean to bore anybody but I was pretty busy myself . I have  
redrawn /designed Xilinx's Parallel Cable Programmer. This programmer   
could be used for the AVNET Spartan 3A board with the 14 way 2.0mm  
header. Leaving the USB and PSOC part for other use.
Plus Windows XP users that upgraded to Service Pack 3 would not have  
any trouble anymore. Since we don't use AVNET's programmer Software  
instead Xilinx's IMPACT. :)
Originally I intend to use this programmer for my home brew CPLD  
development board (I'm still brewing). If anybody is interested in  
what I just wrote contact me and /or I will send you the link to the  
project.

Csaba



>
>
>>
>> Csaba
>>
>>
>> On Dec 18, 2008, at 1:45 AM, Scott Gravenhorst wrote:
>>
>>> music.maker at gte.net wrote:
>>>> Anyone who has this board - a note about the USB-UART Bridge
>>>> (which is useful for getting information to/from a PC), the pin
>>>> information in the user guide PDF is wrong, there are no such
>>>> pins on this particular FPGA. The schematic shows the correct
>>>> pins, but because they are labeled from the PSoC perspective,
>>>> they appear backwards from the FPGA perspective. I.e., the Rx pin
>>>> is really the transmit data pin from the FPGA to the UART.
>>>                                                     ^^^^ --- PSoC
>>> not UART.
>>>
>>> Phhhht.
>>>
>>> -- ScottG
>>> ________________________________________________________________________
>>> -- Scott Gravenhorst
>>> -- FPGA MIDI Synthesizer Information: home1.gte.net/res0658s/ 
>>> FPGA_synth/
>>> -- FatMan: home1.gte.net/res0658s/fatman/
>>> -- NonFatMan: home1.gte.net/res0658s/electronics/
>>> -- When the going gets tough, the tough use the command line.
>>>
>>> _______________________________________________
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>>
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>
> -- ScottG
> ________________________________________________________________________
> -- Scott Gravenhorst
> -- FPGA MIDI Synthesizer Information: home1.gte.net/res0658s/ 
> FPGA_synth/
> -- FatMan: home1.gte.net/res0658s/fatman/
> -- NonFatMan: home1.gte.net/res0658s/electronics/
> -- When the going gets tough, the tough use the command line.
>