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Visitor
Visitor
3,345 Views
Registered: ‎12-19-2016

XC9536XL programming Issues

Hi ,

I am Using CPLD XC9536XL as a replacement for its 5V counterpart XC9536.

This XC9536XL is operating with 3.3V.

I have replaced my existing part 9536 with 9536XL on the PCB by doing hand soldering on the BGA balls. it worked well. it got programmed and functioned good, which is as a proto.

when i Have received a new fab with 9536XL directly mounted on the PWA, i could not able to program the device.?

 

surprisingly the same board from new fab, was removed the CPLD and the Same removed part was hand soldered. and it started working.

 

i could not able to find what going wrong.? kindly help on it.

 

Thanks,

Sriman.

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Xilinx Employee
Xilinx Employee
3,338 Views
Registered: ‎10-24-2013

Hi @srimanchsn

Looks like the soldering is not done correctly.

Thanks,Vijay
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Visitor
Visitor
3,334 Views
Registered: ‎12-19-2016

we performed  BGA Xray for the assembled board and didn't found any issues.

And when tried programming, it says "There are many Unknown devices connected".

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Xilinx Employee
Xilinx Employee
3,328 Views
Registered: ‎10-24-2013

Hi @srimanchsn

Check the below links where the similar topic is discussed.

https://forums.xilinx.com/t5/Xilinx-Boards-and-Kits/Spartan-3AN-Starter-Impact-quot-There-are-many-unknown-device/td-p/16173

https://forums.xilinx.com/t5/Configuration/many-unknown-devices-following-correct-Platform-Flash-detected/td-p/661290

Thanks,Vijay
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Visitor
Visitor
3,322 Views
Registered: ‎12-19-2016

I have read that post and verified the TDO pin for any shorts, but no use.

Is there any further debug i can do on JTAG signals?

As per my sch I have connected TDI pin to 5V pull up through 10K resistor.

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