I want to Erase CFM0，but it seems like flash didn't response.

I want to Erase CFM0，but it seems like flash didn't receive my command. Why?

​

Below are code：

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CFM1 : CFM

port map(

clock => ssClk,

reset_n => ssRst,

avmm_data_addr => slv17avmm_data_addr,

avmm_data_read => slavmm_data_read,

avmm_data_writedata => slv32avmm_data_writedata,

avmm_data_write => slavmm_data_write,

avmm_data_readdata => slv32avmm_data_readdata,

avmm_data_waitrequest => slavmm_data_waitrequest,

avmm_data_readdatavalid => slavmm_data_readdatavalid,

avmm_data_burstcount => B"01",

avmm_csr_addr => slavmm_csr_addr,

avmm_csr_read => slavmm_csr_read,

avmm_csr_writedata => slv32avmm_csr_writedata,

avmm_csr_write => slavmm_csr_write,

avmm_csr_readdata => slv32avmm_csr_readdata

);

​

FlashErase : process( ssClk )

begin

if rising_edge( ssClk ) then

​

slv32MSG_ID_Old <= slv32MSG_ID;

case stFlashEraseState is

when ST_ERASE_IDLE =>

slEraseOK <= '0';

if slv32MSG_ID = X"00001000" and slv32MSG_ID_Old /= X"00001000" then

stFlashEraseState <= ST_ERASE_UNPROTECT;

slavmm_csr_write <= '1';

slavmm_csr_addr <= '1';

slv32avmm_csr_writedata <= X"F7FFFFFF";

end if;

when ST_ERASE_UNPROTECT =>

stFlashEraseState <= ST_ERASE_START;

slavmm_csr_write <= '1';

slavmm_csr_addr <= '1';

slv32avmm_csr_writedata <= X"F7FFFFFF";

when ST_ERASE_START =>

stFlashEraseState <= ST_ERASE_WAIT;

slavmm_csr_write <= '1';

slavmm_csr_addr <= '1';

slv32avmm_csr_writedata <= X"F7DFFFFF";

when ST_ERASE_WAIT =>

stFlashEraseState <= ST_ERASE_WAIT;

slavmm_csr_write <= '0';

slavmm_csr_read <= '1';

slavmm_csr_addr <= '0';

if slv32avmm_csr_readdata(1 downto 0) = B"00" and slv32avmm_csr_readdata(3) = '1' then

stFlashEraseState <= ST_ERASE_IDLE;

slavmm_csr_read <= '0';

slavmm_csr_write <= '1';

slavmm_csr_addr <= '1';

slv32avmm_csr_writedata <= X"FFFFFFFF";

slEraseOK <= '1';

end if;

​

when others =>

null;

end case;

end if;

end process FlashErase;