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- CY15B004Q does not have unique SN features, neither the OP commands regarding to this functionality.
- CY15B004Q does not allow fast reads or writes.
- CY15B004Q has only 4Kbit (512 * 😎 instead of 1Mbit (128k * 8).
- CY15B004Q has a logic bug in the state machine, where the OP code byte 0x0A does not trigger clearing the WEL bit.
- CY15B004Q has 0 - 16 Mhz speed instead of FM25V10 0-40Mhz.
- Labels:
-
Memory F-RAM
- Tags:
- CY15B004Q-SXE
- fm25v10
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Hi Ricardo,
Can you share us scope shots with SCK, SI,SO, and CS line. We need to see if the device is responding anything on the SO line after the opcode for reading SR is fed into the device. On first analysis if you are unable to read the SR then something might be wrong on the connection side (maybe some connection is loose or faulty). If the connections are all ok then we should see some output on the SO line.
Thanks,
Pradipta.
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Hello Pradipta,
Thank you for your answer. I dont think it is a matter of loose connections because I have several units with this F-RAMs with the same problem. I already removed this F-RAM from one device and solder a FM25V10 and everything is working fine. From my analysis:
-The application circuits are the same from both datasheets;
-The op commands for read the status register are the same;
- Dont think it is a loose connection because it is a industrial process and none of the units work;
When applying VDD, is there any measure I can make to verify if the flash is alive? I mean without expecting something on SO.
Here the screenshot with SCK (Yellow), SI(Blue) ,SO (green) , and CS (Red) lines.
Best regards,
Ricardo Gonçalves
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Hi,
Can you check for the tPU time you are using for CY15B004Q device. It should be a min of 1ms. For the FM25V10 this value is 250 us. Can you check this value being used by your software appliaction.
Thanks,
Pradipta.