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ZLu001
Novice
435 Views

Cyclone V IO's can't work on any peripherals, even I2C memory.

same circuits and HDL for cyclone V and IV IO's. it works on cyclone IV, but can't work on Cyclone V for any peripherals, even I2C memory. I tried program the IO's for different voltage setting, but it does't work. using oscillator to see, seems the lower level(logical 0) is going up gradually along the transmit line . 

The I/O ports are gong out directly from FPGA chip then be connected to an I2C chip or register chip.

 

any one can help?

Thanks

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3 Replies
a_x_h_75
New Contributor III
50 Views

Have you constrained your IO for your Cyclone V project? Have you check the report files? It sounds like the pins you are monitoring with your 'oscillator' (oscilloscope?) are unasigned and are probably floating.

 

Cheers,

Alex

50 Views

Hello Zen Lu, As Alex mentioned , Did you get chance to check the IO pins constraints . Can you let me know how i can help for the same ? Thank you , Regards, Sree
ZLu001
Novice
50 Views

Hi, Thanks all

finally I found if I slow down the clock to 500KHz, It works normally, but in cyclone IV, it works well at 1.2MHz.

Thanks any way, I can bear the slow.

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