Hi,
I am a newbie in FPGA realm. They have just bought a Xilinx
Spartan 3E Starter Board in our college. So I am planning to give it a
try. I synthesized some gates, some combinatorial and some sequential
digital circuits.
But if we need to connect some external circuitry to the board what
should I do? I can see many connectors in the board. And what about
the voltage level and isolation?
San.
External Circuit to FPGA.
Started by ●October 2, 2010
Reply by ●October 2, 20102010-10-02
If the I/O of the fpga are connected to the connector (you need to check the schematics of the board) then you can choose the IO standard that you want to use. For example you could choose a 3.3V CMOS standard. The FPGA outputs will have no protection so you will need to make sure that whatever you connect to them you make limit the amount of current. So if you put some LEDs on the outputs you would need to add a current limit resistor. This needs to be sized so that you dont exceed the maximum output current (typically around 25mA, but check the data sheet). Jon --------------------------------------- Posted through http://www.FPGARelated.com
Reply by ●October 2, 20102010-10-02
Yeah I studied the Quick Start Guide of Spartan 3E, but it doesn't mentions any I/O. It has got some analog pins, and a big 100 pin Hirose port. If I need to get some input form external circuit(say digitized sensor data) how can I interface it with the board? San.
Reply by ●October 2, 20102010-10-02
>Yeah I studied the Quick Start Guide of Spartan 3E, but it doesn't >mentions any I/O. It has got some analog pins, and a big 100 pin >Hirose port. If I need to get some input form external circuit(say >digitized sensor data) how can I interface it with the board? > >San. >Without knowing what board you have I cant say exactly, but I guess that the connector has some of its pins connected to the fpga pins. You need to look at the schematics for the board. The fpga has IO banks which means a group of pins on the fpga will be related to an IO voltage. You may be able to set this voltage or it may be hard wired on the board. When you connect your sensor to the board you need to make sure that the output of the sensor matches the IO standard of the fpga pin. So if the sensor outputs 3.3V cmos logic then the fpga pin needs to be set to accept that type of sigmal. If the IO voltage on the fpga is set to something different than say 3.3V and you cant alter it on the fpga board then you may need a level translator chip. Jon --------------------------------------- Posted through http://www.FPGARelated.com
Reply by ●October 4, 20102010-10-04
On Oct 2, 7:33=A0am, Santosh <santos...@gmail.com> wrote:> Hi, > =A0 =A0 I am a newbie in FPGA realm. They have just bought a Xilinx > Spartan 3E Starter Board in our college. So I am planning to give it a > try. I synthesized some gates, some combinatorial and some sequential > digital circuits. > But if we need to connect some external circuitry to the board what > should I do? I can see many connectors in the board. And what about > the voltage level and isolation? > > San.Those boards are made by Digilent. You might check and see if they have a breadboard with the Hirose connector on it.
Reply by ●October 4, 20102010-10-04
radarman <jshamlet@gmail.com> writes:> Those boards are made by Digilent. You might check and see if they > have a breadboard with the Hirose connector on it.They do, for $30. Also a wirewrap and module interface board (for Pmods) which are both cheaper at $20.
Reply by ●October 4, 20102010-10-04
On Oct 4, 5:00=A0pm, Anssi Saari <a...@sci.fi> wrote:> radarman <jsham...@gmail.com> writes: > > Those boards are made by Digilent. You might check and see if they > > have a breadboard with the Hirose connector on it. > > They do, for $30. Also a wirewrap and module interface board (for > Pmods) which are both cheaper at $20.There are a lot of Pmods there. I need to input and output digital data from FPGA board. Please suggest me the exact name. Also, except Hirose port aren't there any ports to connect external circuit? San.
Reply by ●October 4, 20102010-10-04
On Oct 4, 5:42=A0pm, Santosh <santos...@gmail.com> wrote:> On Oct 4, 5:00=A0pm, Anssi Saari <a...@sci.fi> wrote: > > > radarman <jsham...@gmail.com> writes: > > > Those boards are made by Digilent. You might check and see if they > > > have a breadboard with the Hirose connector on it. > > > They do, for $30. Also a wirewrap and module interface board (for > > Pmods) which are both cheaper at $20. > > There are a lot of Pmods there. I need to input and output digital > data from FPGA board. Please suggest me the exact name. Also, except > Hirose port aren't there any ports to connect external circuit? > San.Hi, I found this board. -- http://www.digilentinc.com/Data/Products/FX2BB/FX2B= B_%20rm.pdf Is it the same you people mentioned? And do I need a bus to connect the board with FPGA? Or the Hirose in the daughter board directly couples with the Hirose on FPGA? I didn't found any bus or cables in their site.
Reply by ●October 5, 20102010-10-05
On Oct 4, 4:13=A0pm, Santosh <santos...@gmail.com> wrote:> On Oct 4, 5:42=A0pm, Santosh <santos...@gmail.com> wrote: > > > On Oct 4, 5:00=A0pm, Anssi Saari <a...@sci.fi> wrote: > > > > radarman <jsham...@gmail.com> writes: > > > > Those boards are made by Digilent. You might check and see if they > > > > have a breadboard with the Hirose connector on it. > > > > They do, for $30. Also a wirewrap and module interface board (for > > > Pmods) which are both cheaper at $20. > > > There are a lot of Pmods there. I need to input and output digital > > data from FPGA board. Please suggest me the exact name. Also, except > > Hirose port aren't there any ports to connect external circuit? > > San. > > Hi, > I found this board. -- =A0http://www.digilentinc.com/Data/Products/FX2BB/=FX2BB_%20rm.pdf> =A0Is it the same you people mentioned? And do I need a bus to connect > the board with FPGA? Or the Hirose in the daughter board directly > couples with the Hirose on FPGA? I didn't found any bus or cables in > their site.This board fits to your expansion connector on spartan 3e starter kit. You don't need any bus, cable etc.
Reply by ●October 5, 20102010-10-05
On Oct 4, 4:13=A0pm, Santosh <santos...@gmail.com> wrote:> On Oct 4, 5:42=A0pm, Santosh <santos...@gmail.com> wrote: > > > On Oct 4, 5:00=A0pm, Anssi Saari <a...@sci.fi> wrote: > > > > radarman <jsham...@gmail.com> writes: > > > > Those boards are made by Digilent. You might check and see if they > > > > have a breadboard with the Hirose connector on it. > > > > They do, for $30. Also a wirewrap and module interface board (for > > > Pmods) which are both cheaper at $20. > > > There are a lot of Pmods there. I need to input and output digital > > data from FPGA board. Please suggest me the exact name. Also, except > > Hirose port aren't there any ports to connect external circuit? > > San. > > Hi, > I found this board. -- =A0http://www.digilentinc.com/Data/Products/FX2BB/=FX2BB_%20rm.pdf> =A0Is it the same you people mentioned? And do I need a bus to connect > the board with FPGA? Or the Hirose in the daughter board directly > couples with the Hirose on FPGA? I didn't found any bus or cables in > their site.This board fits to your expansion connector on spartan 3e starter kit. You don't need any bus, cable etc.
