FPGA Central

Hi,

I am using a Digilent Basys Board with Xilinx Spartan 3e. I have an
I2C controller configured to FPGA, which reads data from externally
connected I2C EEPROM through the pmod connectors on the basys board. I
am having below problems.

1) FPGA happens to work only once(outputs correct result on the leds)
when configured. When I the reset I2C controller, the functionality
does not repeat instead all leds are lit or off.

2) When I reset(or switch the power off and on) the FPGA and try to re-
configure it, the chip does not work as expected. But when I pull the
EEPROM off the breadboard, reconnect it, reset the FPGA and
reconfigure it, then I get the result, only for the first time.

I tried simulating by giving reset many times in the testbench and
results were as expected
in the simulation. Why am I having issues in the hardware?

Can any one please help?

Thanks.

On Jan 17, 2:17*am, Digi Suji <digis...@gmail.com> wrote:
> Hi,
>
> I am using a Digilent Basys Board with Xilinx Spartan 3e. I have an
> I2C controller configured to FPGA, which reads data from externally
> connected I2C EEPROM through the pmod connectors on the basys board. I
> am having below problems.
>
> 1) FPGA happens to work only once(outputs correct result on the leds)
> when configured. When I the reset I2C controller, the functionality
> does not repeat instead all leds are lit or off.
>
> 2) When I reset(or switch the power off and on) the FPGA and try to re-
> configure it, the chip does not work as expected. But when I pull the
> EEPROM off the breadboard, reconnect it, reset the FPGA and
> reconfigure it, then I get the result, only for the first time.
>
> I tried simulating by giving reset many times in the testbench and
> results were as expected
> in the simulation. Why am I having issues in the hardware?
>
> Can any one please help?
>
> Thanks.

Is the output from the EEPROM driving one of the FPGA's dual-porpose
configuration pins? Which FPGA configuration mode are you using?

On Jan 17, 2:13*pm, Prevailing over Technology <steve.kn...@prevailing-
technology.com> wrote:
> On Jan 17, 2:17*am, Digi Suji <digis...@gmail.com> wrote:
>
>
>
> > Hi,
>
> > I am using a Digilent Basys Board with Xilinx Spartan 3e. I have an
> > I2C controller configured to FPGA, which reads data from externally
> > connected I2C EEPROM through the pmod connectors on the basys board. I
> > am having below problems.
>
> > 1) FPGA happens to work only once(outputs correct result on the leds)
> > when configured. When I the reset I2C controller, the functionality
> > does not repeat instead all leds are lit or off.
>
> > 2) When I reset(or switch the power off and on) the FPGA and try to re-
> > configure it, the chip does not work as expected. But when I pull the
> > EEPROM off the breadboard, reconnect it, reset the FPGA and
> > reconfigure it, then I get the result, only for the first time.
>
> > I tried simulating by giving reset many times in the testbench and
> > results were as expected
> > in the simulation. Why am I having issues in the hardware?
>
> > Can any one please help?
>
> > Thanks.
>
> Is the output from the EEPROM driving one of the FPGA's dual-porpose
> configuration pins? *Which FPGA configuration mode are you using?

Thanks for the response. Yes external I2C EEPROM is driving FPGA's
dual purpose config pins. Will this cause a problem?
I am using spartan 3e TQ-144 FPGA. I could not find mode pins on this
fpga's footprint. How do I set master serial mode config for this
FPGA? Please help if I am wrong.

Thanks

On Jan 17, 2:13*pm, Prevailing over Technology <steve.kn...@prevailing-
technology.com> wrote:
> On Jan 17, 2:17*am, Digi Suji <digis...@gmail.com> wrote:
>
>
>
> > Hi,
>
> > I am using a Digilent Basys Board with Xilinx Spartan 3e. I have an
> > I2C controller configured to FPGA, which reads data from externally
> > connected I2C EEPROM through the pmod connectors on the basys board. I
> > am having below problems.
>
> > 1) FPGA happens to work only once(outputs correct result on the leds)
> > when configured. When I the reset I2C controller, the functionality
> > does not repeat instead all leds are lit or off.
>
> > 2) When I reset(or switch the power off and on) the FPGA and try to re-
> > configure it, the chip does not work as expected. But when I pull the
> > EEPROM off the breadboard, reconnect it, reset the FPGA and
> > reconfigure it, then I get the result, only for the first time.
>
> > I tried simulating by giving reset many times in the testbench and
> > results were as expected
> > in the simulation. Why am I having issues in the hardware?
>
> > Can any one please help?
>
> > Thanks.
>
> Is the output from the EEPROM driving one of the FPGA's dual-porpose
> configuration pins? *Which FPGA configuration mode are you using?

Yes, output from EEPROM is driving FPGA's dual-purpose pins. I am
using Spartan3E based BASYS board, I cannot set the mode pins of my
choice. I2C master controller is being implemented in FPGA which is
supposed to read data from external I2C EEPROM. Can you tell me what
is the issue?

Thanks.