about:MaxII UFM SPI Mode

[Altera_Forum]

//****** My first queation ****** 

//****** It has been solved by Joe D in# 2*****  Hi,  In MaxII Device Handbook, in Chapter 9, about the UFM, it talks about writing to or reading from the UFM. SPI has two modes: Base Mode and Extended Mode. How can i confirm which mode the cpld uses? Is there any data that should be write into the cpld to make sure which mode i use?   Thanks.  :) //****** My second question ******  So, if i choose Extended Mode, can i do like this?  1. Read State Register, if bit0 == 0 , go to step 2 2. Enable write to UFM (make bit1 <= 1) 3. Set BP0 and BP1 (<=0) 4. Sector Erase  5. Read State Register, if bit0 == 0, go to step6 6. Read From UFM  My puzzle: 1. After finishing these 6 steps above, can i get (FFFF)H from the address which i just indicated in Sector Erase Step?  2. The step sequence is right? Or i miss some stpes? 3. Can i write data to UFM after finishing first 5 steps?  Thanks:)

[Altera_Forum]

See page 9-47, you select it in the megawizard options for the altufm megafunction that is instantiated in your design. Its not programmable real-time but programmable from the wizard configuration you create. base mode is 8-bit data/address and extended mode is 16-bit data/address.

[Altera_Forum]

I get it. Thank you very much:)

[Altera_Forum]

So, if i choose Extended Mode, i can do like this? 

 1. Read State Register, if bit0 == 0 , go to step 2 2. Enable write to UFM (make bit1 <= 1) 3. Set BP0 and BP1 (<=0) 4. Sector Erase  5. Read State Register, if bit0 == 0, go to step6 6. Read From UFM  My puzzle: 1. After finishing these 6 steps above, can i get (FFFF)H from the address which i just indicated in Sector Erase Step?  2. The step sequence is right? Or i miss some stpes? 3. Can i write data to UFM after finishing first 5 steps?  Thanks:)

[Altera_Forum]

Your steps look fine. Yes, you should get all '1's in the addresses you have erased. You can write data to the flash after step 5.