EPCQ128N not works correctly

Hi,

May I know if this issue is related to Nios II firmware or FPGA configuration issue? Could you provide me the full part number?

Hi,

the issue is related to FPGA configure.

The firmware does not include NIOS but only VHDL state machines.

The full part number (Marker on chip) of EPCQ is:

EPCQ128N

CQ226 VS

CHN812

Thanks for support.

Hi,

If I replace the EPCQ memory with another using the same jic file, the FPGA configuration works well.

The memory that works has the following marker:

EPCQ128N

G0OO4 VS

CHN244

Thanks!

Hi,

I observed that EPCQ128N is working and not working. Not sure if what is the different. Not sure if you are able to provide the full part number of the EPCQ128N? Are you using the EPCQ-A device which is not working?

The problem, however, as mentioned above, appears to be associated with a defective production batch. We have a card that mounts Cyclone V part number CEFA7F27C8N and an EPCQ memory used in active serial mode.

A) I purchased in 2016 about 100 pieces of device part number EPCQ128SI16N: these work correctly on the board.

Above the chip there is printed this:

EPCQ128N

G0OO4 VS

CHN 244

B) I then purchased another 50 pieces of device part number EPCQ128SI16N (the same) in 2019: these do not work when mounted on the same card.

The strange thing is that the Programmer write and verify EPCQ128N with USB Blaster successfully.

EPCQ128N device of batch B) seem OK but FPGA configuration doesn't work.

Above the chip there is printed this:

EPCQ128N

CQ226 VS

CHN 812

I checked the signals on the Clock, CSn, Data0 and Data1 pins with an oscilloscope: the signals seem right.

Other useful information:

The tests were performed using various versions of Quartus:

QuartusII 15.1

Quartus Prime Standard 17.1

Quartus Prime Standard 18.1

During the comparative tests, the same jic file has always been used for both memories under test.

I tried to use EPCQ-A: by properly recompiling and generating the jic file they also work correctly.

Only memories of the production batch B) don't work correctly.

Thanks.

below the photo of the chip that does not work.

Hi,

May I know if all 50 device is not working? Could you provide me the jic file that you use to program the flash and also performed read back data from flash to me?

Hi,

I still haven't tried all the memories but for now about 20 memories don't work.

Attached is a test jic file created for EPCQ128.

Attached is the file downloaded from EPCQ128 using Quartus Programmer in 'Examine' mode

Hi,

While I am checking with engineering to understand what is the different between this 2 part, I have check the file that you provided and I am observing some mismatch in the middle of the EPCQ device. May I know if you are able to performed full erase and performed blank check? Have you try to monitor the nStatus pin during power up to see if configuration error is happening?