The first thing to do after power up is to issue an "FF" reset command. Please observe the datasheet timing and chech the R/B# line behavior to make sure that you initialize correctly. Then, you can issue a Read ID command and check that it is correct. From there, you can do your other operations.
Just wondering - what version of the NAND LLD are you using - and where did you download it from? I noticed the Spansion file download section seems to have moved; and the only LLD's are from 2013 that I can find - quite ancient in software years.