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Gyud0's avatar
Gyud0
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

NOR Flash for a FPGA configuration

Hey,

I have a NOR flash in order to configure my FPGA (cyclone V in this case). I have read the principle of a NOR flash operation and I have two questions:

1) What exactly happens in the erase operation, what it means, do the FPGA just writes '0' to all the space memory?

2) There is any difference between filling a NOR flash with all bits with the value '1' (like 0xffffffff.....) and mixed bits values like 0xaaaaaaaaaa or random values like 0x54321.... ?

Regards,

Gal

1 Reply

  • NurAiman_M_Intel's avatar
    NurAiman_M_Intel
    Icon for Super Contributor rankSuper Contributor
    5 years ago

    Hi,


    In erase operation, NOR Flash will become 0xffffffff, it will become 0x00000000 if it is NAND flash.


    NOR flash cell in its default state is logically equivalent to a binary "1" value, because current will flow through the channel under application of an appropriate voltage to the control gate, so that the bitline voltage is pulled down


    Regards,

    Aiman