參數(shù)資料
型號(hào)： M28R400CTB90ZB6T
廠商： 意法半導(dǎo)體
英文描述： 4 Mbit (256Kb x16, Boot Block) 1.8V Supply Flash Memory
中文描述： 4兆位（256Kb的x16插槽，引導(dǎo)塊）1.8V電源快閃記憶體
文件頁(yè)數(shù)： 3/50頁(yè)
文件大?。?/td> 755K
代理商： M28R400CTB90ZB6T
11/50
During the erase operation the memory will only
accept the Read Status Register command. All
other commands will be ignored, including the
Erase Suspend command. It is not possible to is-
sue any command to abort the operation.
Chip Erase commands should be limited to a max-
imum of 100 Program/Erase cycles. After 100 Pro-
gram/Erase cycles the internal algorithm will still
operate properly but some degradation in perfor-
mance may occur.
Typical chip erase times are given in Table 7.
Program Command
The memory array can be programmed word-by-
word. Two bus write cycles are required to issue
the Program Command.
s
The first bus cycle sets up the Program
command.
s
The second latches the Address and the Data to
be written and starts the Program/Erase
Controller.
During Program operations the memory will ac-
cept the Read Status Register command and the
Program/Erase Suspend command. Typical Pro-
gram times are given in Table 7, Program, Erase
Times and Program/Erase Endurance Cycles.
Programming aborts if Reset goes to VIL. 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 Appendix C, Figure 15, Program Flowchart
and Pseudo Code, 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 VPP is not at VPPH. The command can be
executed if VPP is below VPPH but the result is not
guaranteed.
Three bus write cycles are necessary to issue the
Double Word Program command.
s
The first bus cycle sets up the Double Word
Program Command.
s
The second bus cycle latches the Address and
the Data of the first word to be written.
s
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 VIL. 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 Appendix C, Figure 16, Double Word Pro-
gram Flowchart and Pseudo Code, 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 VIH. Program/Erase is aborted if
Reset turns to VIL.
See Appendix C, Figure 17, Program Suspend &
Resume Flowchart and Pseudo Code, and Figure
19, Erase Suspend & Resume Flowchart and
Pseudo Code for flowcharts for using the Program/
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 Appendix C, Figure 17, Program Suspend &
Resume Flowchart and Pseudo Code, and Figure
19, Erase Suspend & Resume Flowchart and
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