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risic2024's avatar
risic2024
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1 year ago

program successfully but output always high

hi, I am confused by EPM240T100C5,have tried many ways, but still failed, please give me some advices, thanks. It indicated the programming is successful, but output always stay high. even only as...
Programmable Logic Device
risic2024's avatar
risic2024
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1 year ago

hi, FvM,

I manually create a BSDL file for EPM240T100C5("Device family does not support board-level Boundary-Scan Description Language file generation" for MAX II in quartus. and BSDL is not found in Altera web. )

Following your suggestion, I download TopJTAG. with EXTEST instruction, I can force pin into 0 by “set to 0”. Please find the attached for the TopJtag testing result. The output of bit[2:0] are really set to be low level from PCB side(bit[2],bit[1],bit[0] corresponds to pin84,pin88 and pin90 respectively)
Hopefully, it will help narrow down the cause why it can’t enter user mode. Any log or testing necessary, please let me know, thanks.