Non Volatile RAM (F-RAM & NVSRAM) Forum Discussions

Hi

Hi

We received a delivery of CY15B102QSN-108SXI expecting the top marking Line 1 : CY152B3

What we got is the marking CY151B3

Is this also a valid marking for above mentioned device? Are there more valid markings?

Thanks in advance

aro

Hi,

We are planning to use 32KB NVRAM (with or without external battery) in our design. Pls suggest a part.

Regards,

Srikanth Kacchu

Hello,

I am having trouble getting read responses from a 4Mb fram. I have tried utilizing two different TI launchpads (C2000/Tiva) to communicate with the device. I have been running the clk speed in the 1Mhz to 2Mhz range. Also, I am utilizing a GPIO pin as a chip select as the spi CS peripheral de-asserts after each byte is transmitted. Pseudo code is as follows in my testing program:

set "CS" line high.

setup spi periph for Mode 0

// software reset.

write(0x66)

write(0x99)

delay for 300us

write(0x06)

write(0x02, 0x01, 0x12, 0x34, 0xaa, 0x55)

read(0x03, 0x01, 0x12, 0x34, 0x00, 0x00)

end program.

The parenthesis open indicates CS going low, and parenthesis closed indicates CS going high. In the program, my receive bytes are 0xFF, 0xFF. In other testing programs, I have tried writing to the status/config registers and I am getting 0xFF bytes as well.

I am including scope shots from the TI C2000 based board. Are there any steps that I am missing in getting the device to function? Thanks for the help.

Hello,

I'm inquiring whether there exists a dedicated Linux device driver or a compatible one for facilitating communication with the FM31256-G chip via the I2C protocol.

Your assistance on this matter would be greatly appreciated.

Thank you in advance.

Regarding CY14B101LA-BA45XIT, is there any command to read device ID or UID like flash memory?
The data sheet doesn't mention it, so can you tell me?