Numonyx™ Wireless Flash Memory (W18)
Table 26: Status Register Descriptions
Bit
7
Name
DWS
Device WSM Status
ESS
Erase Suspend Status
ES
Erase Status
PS
Program Status
VPPS
VPP Status
PSS
Program Suspend
Status
DPS
Device Protect Status
State
0 = Device WSM is Busy
1 = Device WSM is Ready
0 = Erase in progress/completed
1 = Erase suspended
0 = Erase successful
1 = Erase error
0 = Program successful
1 = Program error
0 = V
PP
OK
1 = V
PP
low detect, operation aborted
0 = Program in progress/completed
1 = Program suspended
0 = Unlocked
1 = Aborted erase/program attempt on
locked block
0 = This partition is busy, but only if
SR[7]=0
1 = Another partition is busy, but only
if SR[7]=0
Description
SR[7] indicates erase or program completion in the
device. SR[6:1] are invalid while SR[7] = 0. See
for valid SR[7] and SR[0] combinations.
After issuing an Erase Suspend command, the WSM
halts and sets SR[7] and SR[6]. SR[6] remains set
until the device receives an Erase Resume command.
SR[5] is set if an attempted erase failed. A Command
Sequence Error is indicated when SR[7,5:4] are set.
SR[4] is set if the WSM failed to program a word.
The WSM indicates the V
PP
level after program or erase
completes. SR[3] does not provide continuous V
PP
feedback and isn’t guaranteed when V
PP
≠
V
PP1/2
.
After receiving a Program Suspend command, the
WSM halts execution and sets SR[7] and SR[2]. They
remain set until a Resume command is received.
If an erase or program operation is attempted to a
locked block (if WP# = V
IL
), the WSM sets SR[1] and
aborts the operation.
Addressed partition is erasing or programming. In EFP
mode, SR[0] indicates that a data-stream word has
finished programming or verifying depending on the
particular EFP phase. See
for valid SR[7]
and SR[0] combinations.
6
5
4
3
2
1
0
PWS
Partition Write Status
Table 27: Status Register Device WSM and Partition Write Status Description
DWS
(SR[7])
0
0
PWS
(SR[0])
0
1
Description
The addressed partition is performing a program/erase operation.
EFP: device has finished programming or verifying data, or is ready for data.
A partition other than the one currently addressed is performing a program/erase operation.
EFP: the device is either programming or verifying data.
No program/erase operation is in progress in any partition. Erase and Program suspend bits (SR[6,2])
indicate whether other partitions are suspended.
EFP: the device has exited EFP mode.
Won’t occur in standard program or erase modes.
EFP: this combination does not occur.
1
0
1
1
10.7
Clear Status Register
The Clear Status Register command clears the Status Register and leaves all partition
output states unchanged. The WSM can set all Status Register bits and clear bits
SR[7:6,2,0]. Because bits SR[5,4,3,1] indicate various error conditions, they can only
be cleared by the Clear Status Register command. By allowing system software to reset
these bits, several operations (such as cumulatively programming several addresses or
erasing multiple blocks in sequence) can be performed before reading the Status
Register to determine error occurrence. If an error is detected, the Status Register
must be cleared before beginning another command or sequence. Device reset (RST#
= V
IL
) also clears the Status Register. This command functions independently of V
PP.
Datasheet
58
November 2007
Order Number: 290701-18
NUMONYX [ NUMONYX B.V ]
