Cyclone development board and its P30 Flash

Honored Contributor

18 years ago

1/ As I remember, you don't need to toggle CE & WE at the same time.

2/ We did NOR flash Emulator for Spansion, STM, SST, Winbond, MXIC.

All of them need to do following sequence if you're trying to write correctly:

Reset -> Erase -> Program -> Check Ready Pin -> Verify(Read)

Which means I have to following sequence

(VHDL code just for telling you the seq, not really working)

When Reset0=> D(7 downto 0)<="11110000"; CE<='0'; WE<='0'; --F0

When Reset1=> WE<='1';

When Erase=> -- depends on where and which kind of Erase you want, sequence is like program

When Program0=> D(7 downto 0)<= "10101010";

[/INDENT]A(10 downto 0)<="10101010101"; WE<='0'; --555/AA

When Program1=> WE<='1';

When Program2=> D(7 downto 0)<= "01010101";

[/INDENT]A(10 downto 0)<="01010101010"; WE<='0'; --2AA/55

When Program3=> WE<='1';

When Program4=> D(7 downto 0)<= "10100000";

[/INDENT]A(10 downto 0)<="10101010101"; WE<='0'; --555/A0

When Program5=> WE<='1';

When Program6=> D<="your data"; A<="your address"; WE<='0';

When Program7=> WE<='1';

-- Then, do Ready/Busy pin check

-- And now you can read it

I believe Intel's Strata Flash do so.

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