M28W160ECT, M28W160ECB
Programming aborts if Reset goes to V
IL
. As data
integrity cannot be guaranteed when the program
operation is aborted, the block containing the
memory location must be erased and repro-
grammed.
See
for the flowchart for using
the Program command.
Double Word Program Command
This feature is offered to improve the programming
throughput, writing a page of two adjacent words
in parallel.The two words must differ only for the
address A0. Programming should not be attempt-
ed when V
PP
is not at V
PPH
. The command can be
executed if V
PP
is below V
PPH
but the result is not
guaranteed.
Three bus write cycles are necessary to issue the
Double Word Program command.
■
The first bus cycle sets up the Double Word
Program Command.
■
The second bus cycle latches the Address and
the Data of the first word to be written.
■
The third bus cycle latches the Address and
the Data of the second word to be written and
starts the Program/Erase Controller.
Read operations output the Status Register con-
tent after the programming has started. Program-
ming aborts if Reset goes to V
IL
. As data integrity
cannot be guaranteed when the program opera-
tion is aborted, the block containing the memory
location must be erased and reprogrammed.
See
for the flow-
chart for using the Double Word Program
command.
Clear Status Register Command
The Clear Status Register command can be used
to reset bits 1, 3, 4 and 5 in the Status Register to
‘0’. One bus write cycle is required to issue the
Clear Status Register command.
The bits in the Status Register do not automatical-
ly return to ‘0’ when a new Program or Erase com-
mand is issued. The error bits in the Status
Register should be cleared before attempting a
new Program or Erase command.
Program/Erase Suspend Command
The Program/Erase Suspend command is used to
pause a Program or Erase operation. One bus
write cycle is required to issue the Program/Erase
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, Block Lock, Block Lock-Down or
Protection Program commands will also be ac-
cepted. The block being erased may be protected
by issuing the Block Protect, Block Lock or Protec-
tion Program commands. When the Program/
Erase Resume 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
IH
. Program/Erase is aborted if
Reset turns to V
IL
.
See
and
for flowcharts for using the Pro-
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-
quent Bus Read operations read the Status Reg-
ister.
See
and
for flowcharts for using the Pro-
gram/Erase Resume command.
Protection Register Program Command
The Protection Register Program command is
used to Program the 64 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.
■
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.
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. Bit 1 of the Pro-
tection Lock Register protects bit 2 of the Protec-
tion Lock Register. Programming bit 2 of the
Protection Lock Register will result in a permanent
protection of the Security Block (see
Attempting to program a previously pro-
tected Protection Register will result in a Status
12/50
NUMONYX [ NUMONYX B.V ]
