Preliminary information
®
AS29F400
Automated on-chip programming algorithm
Write program command sequence
(see below)
Automated on-chip erase algorithm
Write erase command sequence
(see below)
DATA polling or toggle bit
successfully completed
DATA poll device
Erase complete
Chip erase command sequence
×16 mode (address/command):
5555h/AAh
YES
Programming completed
2AAAh/55h
2AAAh/55h
Sector erase command sequence
×16 mode (address/command):
5555h/AAh
Verify byte? NO
Program command sequence
×16 mode (address/command):
5555h/AAh
5555h/80h
5555h/80h
5555h/AAh
5555h/AAh
2AAAh/55h
2AAAh/55h
2AAAh/55h
5555h/A0h
5555h/10h
Sector address/30h
Program address/program data
Optional multiple
sector erase commands
†
Sector address/30h
Sector address/30h
†
The system software should check the status of DQ3 prior to and
following each subsequent sector erase command to ensure command
completion. The device may not have accepted the command if DQ3 is
high on second status check.
9
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
