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Numonyx <strong>Wireless</strong> <strong>Flash</strong> <strong>Memory</strong> (<strong>W30</strong>)<br />
Table 21: Status Register Definitions<br />
DWS ESS ES PS VPPS PSS DPS PWS<br />
7 6 5 4 3 2 1 0<br />
Table 22: Status Register Descriptions<br />
Bit Name State Description<br />
7<br />
6<br />
5<br />
4<br />
3<br />
2<br />
1<br />
0<br />
DWS<br />
Device WSM Status<br />
ESS<br />
Erase Suspend Status<br />
ES<br />
Erase Status<br />
PS<br />
Program Status<br />
VPPS<br />
VPP Status<br />
PSS<br />
Program Suspend<br />
Status<br />
DPS<br />
Device Protect Status<br />
PWS<br />
Partition Write Status<br />
0 = Device WSM is Busy<br />
1 = Device WSM is Ready<br />
0 = Erase in progress/completed<br />
1 = Erase suspended<br />
0 = Erase successful<br />
1 = Erase error<br />
0 = Program successful<br />
1 = Program error<br />
0 = V PP OK<br />
1 = V PP low detect, operation aborted<br />
0 = Program in progress/completed<br />
1 = Program suspended<br />
0 = Unlocked<br />
1 = Aborted erase/program attempt on<br />
a locked block<br />
0 = This partition is busy, but only if<br />
SR[7]=0<br />
1 = Another partition is busy, but only<br />
if SR[7]=0<br />
• SR[7] indicates erase or program completion in<br />
the flash device.<br />
• SR[6:1] are invalid while SR[7] = 0.<br />
See Table 23 for valid SR[7] and SR[0]<br />
combinations.<br />
After issuing an Erase Suspend command, the WSM<br />
halts and sets SR[7] and SR[6]. SR[6] remains set<br />
until the flash device receives an Erase Resume<br />
command.<br />
• SR[5] is set if an attempted erase failed.<br />
• A Command Sequence Error is indicated when<br />
SR[7,5:4] are set.<br />
SR[4] is set if the WSM failed to program a word.<br />
The WSM indicates the V PP level after program or erase<br />
completes.<br />
SR[3] does not provide continuous V PP feedback and is<br />
not guaranteed when V PP ≠V PPL /V PPH<br />
After receiving a Program Suspend command, the<br />
WSM halts execution and sets SR[7] and SR[2]. These<br />
bits remain set until a Resume command is received.<br />
If an erase or program operation is attempted to a<br />
locked block (if WP# = V IL ), the WSM sets SR[1] and<br />
aborts the operation.<br />
The addressed partition is erasing or programming. In<br />
EFP mode, SR[0] indicates that a data-stream word<br />
has finished programming or verifying, depending on<br />
the particular EFP phase.<br />
See Table 23 for valid SR[7] and SR[0]<br />
combinations.<br />
Table 23: Status Register Device WSM and Partition Write Status Description<br />
DWS<br />
(SR[7])<br />
PWS<br />
(SR[0])<br />
0 0<br />
0 1<br />
1 0<br />
1 1<br />
Description<br />
The addressed partition is performing a program/erase operation.<br />
EFP: the flash device has finished programming or verifying data, or is ready for data.<br />
A partition other than the one currently addressed is performing a program/erase operation.<br />
EFP: the flash device is either programming or verifying data.<br />
No program/erase operation is in progress in any partition. Erase and Program suspend bits (SR[6,2])<br />
indicate whether other partitions are suspended.<br />
EFP: the flash device has exited EFP mode.<br />
Does not occur in standard program or erase modes.<br />
EFP: this combination does not occur.<br />
November 2007 Datasheet<br />
Order Number: 290702-13 57
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