MT28F320A18 Micron Technology, MT28F320A18 Datasheet - Page 19

• Manufacturer Part Number: MT28F320A18
• Description: FLASH MEMORY
• Manufacturer: Micron Technology

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DataSheet
Table 8:
2 Meg x 16, 1.8V Enhanced+ Boot Block Flash Memory
MT28F320A18_F.fm – Rev F 08/03 EN
4
STATUS BIT
U
WSMS
.com
SR7
SR6
SR5
SR4
SR3
SR2
SR1
SR0
#
7
WRITE STATE MACHINE STATUS (WSMS)
1 = Ready
0 = Busy
ERASE SUSPEND STATUS (ESS)
1 = BLOCK ERASE Suspended
0 = BLOCK ERASE in Progress/Completed
ERASE STATUS (ES)
1 = Error in Block Erasure
0 = Successful BLOCK ERASE
PROGRAM STATUS (PS)
1 = Error in PROGRAM
0 = Successful PROGRAM
V
1 = V
0 = V
PROGRAM SUSPEND STATUS (PSS)
1 = Program Suspended
0 = Program in Progress/Completed
BLOCK LOCK STATUS (BLS)
1 = PROGRAM/ERASE Attempted on a
Locked Block; Operation Aborted
0 = No operation to locked blocks
RESERVED FOR FUTURE ENHANCEMENTS This bit is reserved for future enhancements.
Status Register Bit Definition
PP
STATUS (V
PP
PP
ESS
6
Low Detect, Operation Abort
= OK
STATUS REGISTER BIT
PP
S)
ES
5
1.8V ENHANCED+ BOOT BLOCK FLASH MEMORY
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PS
4
Check write state machine bit first to determine word program
or block erase completion, before checking program or erase
status bits.
When ERASE SUSPEND is issued, WSM halts execution and sets
both WSMS and ESS bits to “1.” ESS bit remains set to “1” until
an ERASE RESUME command is issued.
When this bit is set to “1,” WSM has applied the maximum
number of erase pulses to the block and is still unable to verify
successful block erasure.
When this bit is set to “1,” WSM has attempted but failed to
program a word.
The V
V
program or erase command sequences have been entered. The
WSM informs the system if V
checked before the PROGRAM/ERASE operation is verified by
the WSM.
When PROGRAM SUSPEND is issued, WSM halts execution and
sets both WSMS and PSS bits to “1.” PSS bit remains set to “1”
until a PROGRAM RESUME command is issued.
If a PROGRAM or ERASE operation is attempted to one of the
locked blocks, this is set by the WSM. The operation specified is
aborted and the device is returned to read status mode.
PP
19
level. The WSM interrogates the V
PP
status bit does not provide continuous indication of the
V
PP
3
S
PSS
DESCRIPTION
2
PP
< 0.9V. The V
PP
BLS
level only after the
1
2 MEG x 16
PP
level is also
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