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Visitor sushma7
Visitor
2,924 Views
Registered: ‎05-07-2013

adc spartan 3e

i have problem regarding adc of spartan 3e. simulation works well but when i load it into the board. it didnt work. i have used switch 0 to start the conversion. after switch 0 is turned on different values of adc bits appear on leds but after some time they all became high. this process is same regardless of the adc input, even when their is no input same process repeats on leds. i am dubugging it for 3 days but i am unable to find out the problem. please have a look on it.

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3 Replies
Scholar austin
Scholar
2,915 Views
Registered: ‎02-27-2008

Re: adc spartan 3e

s,

 

One post is sufficient.  Have you de-bounced the push-button?  If not, the pushbutton action will 'bounce' many times, on and off, so your start signal is probably violating all kinds of timing and operation constraints.

 

 

Austin Lesea
Principal Engineer
Xilinx San Jose
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Visitor sushma7
Visitor
2,904 Views
Registered: ‎05-07-2013

Re: adc spartan 3e

Thanx for your reply. I am new to forum so.
No i did not debounce that. even when i do not use reset button the output is same. Simulation is working but even when i removed the start switch n make fsm run smoothly the output is same. Initially led blinks and after some time they are all high irrespective of input.





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Highlighted
Explorer
Explorer
2,034 Views
Registered: ‎12-22-2010

Re: adc spartan 3e

hi
i see in this page https://www.facebook.com/FpgaAndVhdl
an optimized VHDL and its take only 1% from FPGA chip.
that make ADC of spartan 3E work
the code simple
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