I found document that states to maintain software autostore disable after power down, you must also issue a software store sequence before power down. I will attempt this and report back.
I can explain about the soft sequence commands:
a) Only 13 address lines matter for the soft sequence commands.
E.g. for the command specified as address location 0x4E38
0100 1110 0011 1000)
4 E 3 8
Only the address lines number (A2-A13) matter and should have the values specified above.
That means that even if a read from another location where A14=0 and A15=1 and A0=1 (i.e 0x8E39 instead of 0x4E38 is treated as a soft sequence initiation command)
1000 1110 0011 1001
8 E 3 9
b) Yes, to disable AutoStore after a sequence for disabling AutoStore is complete, a software store or a HSB store has to be initiated. This saves the state of AutoStore disable and from the next power cycle, Autostore will be disabled.
If SoftwareStore or HSB Store is not done after disabling AutoStore, then from the next power cycle AutoStore will not be disabled.
Thank you ajai for the response. With the correct data input defined I could look elsewhere.
I found that most of my problems were due to HSB pin acidentally droppping low between tests and causing hardware store at wrong time.
Thanks for the help,
No problems, good luck for your design.