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參數資料
| 型號： | M95020-RDW6 |
| 廠商： | 意法半導體 |
| 元件分類： | DRAM |
| 英文描述： | 4Kbit, 2Kbit and 1Kbit Serial SPI Bus EEPROM With High Speed Clock |
| 中文描述： | 4Kbit，2Kbit和1Kbit SPI總線串行EEPROM的高速時鐘 |
| 文件頁數： | 10/37頁 |
| 文件大?。?/td> | 586K |
| 代理商： | M95020-RDW6 |
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M95040, M95020, M95010
10/37
Status Register
Figure 7.
shows the position of the Status Register
in the control logic of the device. This register con-
tains a number of control bits and status bits, as
shown in
Table 3.
.
Bits b7, b6, b5 and b4 are always read as 1.
WIP bit.
The Write In Progress bit is a volatile
read-only bit that is automatically set and reset by
the internal logic of the device. When set to a 1, it
indicates that the memory is busy with a Write cy-
cle.
WEL bit.
The Write Enable Latch bit is a volatile
read-only bit that is set and reset by specific in-
structions. When reset to 0, no WRITE or WRSR
instructions are accepted by the device.
BP1, BP0 bits.
The Block Protect bits are non-
volatile read-write bits. These bits define the area
of memory that is protected against the execution
of Write cycles, as summarized in
Table 4.
.
Table 3. Status Register Format
Data Protection and Protocol Control
To help protect the device from data corruption in
noisy or poorly controlled environments, a number
of safety features have been built in to the device.
The main security measures can be summarized
as follows:
–
The WEL bit is reset at power-up.
–
Chip Select (S) must rise after the eighth clock
count (or multiple thereof) in order to start a
non-volatile Write cycle (in the memory array
or in the Status Register).
–
Accesses to the memory array are ignored
during the non-volatile programming cycle,
and the programming cycle continues
unaffected.
–
Invalid Chip Select (S) and Hold (HOLD)
transitions are ignored.
For any instruction to be accepted and executed,
Chip Select (S) must be driven High after the rising
edge of Serial Clock (C) that latches the last bit of
the instruction, and before the next rising edge of
Serial Clock (C).
For this, “the last bit of the instruction” can be the
eighth bit of the instruction code, or the eighth bit
of a data byte, depending on the instruction (ex-
cept in the case of RDSR and READ instructions).
Moreover, the "next rising edge of CLOCK" might
(or might not) be the next bus transaction for some
other device on the bus.
When a Write cycle is in progress, the device pro-
tects it against external interruption by ignoring
any subsequent READ, WRITE or WRSR instruc-
tion until the present cycle is complete.
Table 4. Write-Protected Block Size
b7
b0
1
1
1
1
BP1
BP0 WEL WIP
Block Protect Bits
Write Enable Latch Bit
Write In Progress Bit
Status Register Bits
Protected Block
Array Addresses Protected
BP1
BP0
M95040
M95020
M95010
0
0
none
none
none
none
0
1
Upper quarter
180h - 1FFh
C0h - FFh
60h - 7Fh
1
0
Upper half
100h - 1FFh
80h - FFh
40h - 7Fh
1
1
Whole memory
000h - 1FFh
00h - FFh
00h - 7Fh
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相關代理商/技術參數 |
參數描述 |
|---|---|
| M95020-RDW6/W | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4Kbit, 2Kbit and 1Kbit Serial SPI Bus EEPROM With High Speed Clock |
| M95020-RDW6G | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4Kbit, 2Kbit and 1Kbit Serial SPI Bus EEPROM With High Speed Clock |
| M95020-RDW6G/W | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4Kbit, 2Kbit and 1Kbit Serial SPI Bus EEPROM With High Speed Clock |
| M95020-RDW6P | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4Kbit, 2Kbit and 1Kbit Serial SPI Bus EEPROM With High Speed Clock |
| M95020-RDW6P/W | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4Kbit, 2Kbit and 1Kbit Serial SPI Bus EEPROM With High Speed Clock |
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