about mif file question

[Altera_Forum]

Hello All advanced: 

i created a Block RAM IP from MegaWizard,and addition a XX.mif to RAM for initial value,and gererator XX.pof after compilation   xx.mif content as below: WIDTH=16; DEPTH=1; ADDRESS_RADIX=UNS; DATA_RADIX=HEX; CONTENT BEGIN  0 : 1234; END;     1.i programming XX.pof to EPCS,and restart power,then FPGA working Ok,  and read XX.mif value is 16'h1234(that is correct)  2.i modify XX.mif value as below,and gererator new XX.pof   after re-compilation WIDTH=16; DEPTH=1; ADDRESS_RADIX=UNS; DATA_RADIX=HEX; CONTENT BEGIN  0 : aabb; END;   3.i programming new XX.pof to EPCS,and restart power,then FPGA working Ok,but read XX.mif value is 16'h1234 rather than 16'aabb   so how to solve this problem？

[Altera_Forum]

Perhaps Quartus didn't detect the change. Try deleting your /db and /incremental_db directories, recompile, and program the EPCS. 

 Also I assume you are just testing for now and don't plan on instantiating a single word RAM/ROM (that's a waste of a memory block since you can use a flip flop for that). If you plan one using a single word memory so that you can use the in-system memory editor then you are better off instantiating lpm_constant since you can edit it as well over JTAG.

[Altera_Forum]

hello Badomen: 

very gratitude your answer, i just use a single word for instantiating, actuality, i use memory editor to edit memory content   so delet /db that is to say delet all file from /db directory,is correct？ 

[Altera_Forum]

That's correct, make sure you delete those files with the Quartus project closed though. You can delete both /db and /incremental_db. By doing this you'll force Quartus to recompile everything. 

 If you only need to edit one value you don't need an on-chip memory to do this. If you instantiate the megawizard "lpm_constant" you can use the memory editor to modify it on the fly as well and not waste a memory block in the process. I do this from time to time to inject bits into my hardware.