M28W320FSU STMICROELECTRONICS [STMicroelectronics], M28W320FSU Datasheet - Page 14

• Manufacturer Part Number: M28W320FSU
• Description: 32Mbit (2Mb x16) and 64Mbit (4Mb x16) 3V Supply, Uniform Block, Secure Flash Memories
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M28W320FSU, M28W640FSU
command and pause the Program/Erase control-
ler.
During Program/Erase Suspend the Command In-
terface will accept the Program/Erase Resume,
Read Array, Read Status Register, Read Electron-
ic Signature and Read CFI Query commands. Ad-
ditionally, if the suspend operation was Erase then
the Program, Double Word Program, Quadruple
Word Program, Block Lock, or Protection Program
commands will also be accepted. The block being
erased may be protected by issuing the Block Pro-
tect, Block Lock or Protection Program com-
mands.
command is issued the operation will complete.
Only the blocks not being erased may be read or
programmed correctly.
During a Program/Erase Suspend, the device can
be placed in a pseudo-standby mode by taking
Chip Enable to V
Reset turns to V
See
& Resume Flowchart and Pseudo
ure 19., Erase Suspend & Resume Flowchart and
Pseudo
gram/Erase Suspend command.
Program/Erase Resume Command
The Program/Erase Resume command can be
used to restart the Program/Erase Controller after
a Program/Erase Suspend operation has paused
it. One Bus Write cycle is required to issue the
command. Once the command is issued subse-
14/49
APPENDIX
Code, for flowcharts for using the Pro-
When
IL
C.,
.
IH
the
. Program/Erase is aborted if
Figure 17., Program Suspend
Program/Erase
Code, and
Resume
Fig-
quent Bus Read operations read the Status Reg-
ister.
See
& Resume Flowchart and Pseudo
ure 19., Erase Suspend & Resume Flowchart and
Pseudo
gram/Erase Resume command.
Protection Register Program Command
The Protection Register Program command is
used to Program the 128 bit user One-Time-Pro-
grammable (OTP) segment of the Protection Reg-
ister. The segment is programmed 16 bits at a
time. When shipped all bits in the segment are set
to ‘1’. The user can only program the bits to ‘0’.
Two write cycles are required to issue the Protec-
tion Register Program command.
Read operations output the Status Register con-
tent after the programming has started.
The segment can be protected by programming bit
1 of the Protection Lock Register (see
6., Protection Register Memory
to program a previously protected Protection Reg-
ister will result in a Status Register error. The pro-
tection of the Protection Register is not reversible.
The Protection Register Program cannot be sus-
pended.
The first bus cycle sets up the Protection
Register Program command.
The second latches the Address and the Data
to be written to the Protection Register and
starts the Program/Erase Controller.
APPENDIX
Code, for flowcharts for using the Pro-
C.,
Figure 17., Program Suspend
Map). Attempting
Code, and
Figure
Fig-