M28R400CT, M28R400CB
gram/Erase Controller Status bit is High (Program/
Erase Controller inactive). Bit 2 is set within 5µs of
the Program/Erase Suspend command being is-
sued therefore the memory may still complete the
operation rather than entering the Suspend mode.
When a Program/Erase Resume command is is-
sued the Program Suspend Status bit returns Low.
Block Protection Status (Bit 1). The Block Pro-
tection Status bit can be used to identify if a Pro-
gram or Erase operation has tried to modify the
contents of a locked block.
When the Block Protection Status bit is High (set
to ‘1’), a Program or Erase operation has been at-
tempted on a locked block.
Once set High, the Block Protection Status bit can
only be reset Low by a Clear Status Register com-
mand or a hardware reset. If set High it should be
reset before a new command is issued, otherwise
the new command will appear to fail.
Reserved (Bit 0). Bit 0 of the Status Register is
reserved. Its value must be masked.
Note: Refer to APPENDIX C., FLOWCHARTS
AND PSEUDO CODES, for using the Status
Register.
Table 10. Status Register Bits
Bit
Name
Logic Level
Definition
'1'
'0'
'1'
'0'
'1'
'0'
'1'
'0'
'1'
'0'
'1'
'0'
'1'
'0'
Ready
7
P/E.C. Status
Busy
Suspended
6
5
4
3
2
Erase Suspend Status
Erase Status
In progress or Completed
Erase Error
Erase Success
Program Error
Program Status
Program Success
V
V
Invalid, Abort
OK
PP
V
Status
PP
PP
Suspended
Program Suspend Status
In Progress or Completed
Program/Erase on protected Block, Abort
No operation to protected blocks
1
0
Block Protection Status
Reserved
Note: Logic level '1' is High, '0' is Low.
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NUMONYX [ NUMONYX B.V ]
