Numonyx™ Wireless Flash Memory (W18)
Figure 29: Erase Suspend / Resume Flowchart
ERASE SUSPEND / RESUME PROCEDURE
Start
Erase
Suspend
Bus
Command
Operation
Write
Erase
Suspend
Read
Status
Comments
Data = B0h
Addr = Any address
Data = 70h
Addr = Same partition
Status register data. Toggle CE# or
OE# to update Status register
Addr = Same partition
Check SR.7
1 = WSM ready
0 = WSM busy
Check SR.6
1 = Erase suspended
0 = Erase completed
Write B0h
Any Address
Read
Status
Write
Write 70h
Same Partition
Read
Read Status
Register
Standby
SR.7 =
1
0
0
Standby
Erase
Completed
Write
Read or
Write
Write
Program
Resume
SR.6 =
1
Read Array Data = FFh or 40h
or Program Addr = Block to program or read
Read array or program data from/to
block other than the one being erased
Data = D0h
Addr = Any address
Read
Read or
Program?
No
Program
Read Array
Data
Program
Loop
Done?
Erase
Yes
Resume
Read
Array
If the suspended partition was placed in
Read Array mode or a Program Loop:
Write
Read
Status
Return partition to Status mode:
Data = 70h
Addr = Same partition
Write D0h
Any Address
Write FFh
Erased Partition
Read Array
Data
Erase Resumed
Read
Status
Write 70h
Same Partition
ERAS_SUS.WMF
12.2
Block Erase
The 2-cycle block erase command sequence, consisting of Erase Setup (20h) and Erase
Confirm (D0h), initiates one block erase at the addressed block. Only one partition can
be in an erase mode at a time; other partitions must be in a read mode. The Erase
Confirm command internally latches the address of the block to be erased. Erase forces
all bits within the block to 1. SR[7] is cleared while the erase executes.
After writing the Erase Confirm command, the selected partition is placed in read
Status Register mode and reads performed to that partition return the current status
data. The address given during the Erase Confirm command does not need to be the
same address used in the Erase Setup command. So, if the Erase Confirm command is
given to partition B, then the selected block in partition B will be erased even if the
Erase Setup command was to partition A.
November 2007
Order Number: 290701-18
Datasheet
67
NUMONYX [ NUMONYX B.V ]
