參數(shù)資料
型號： M29W320DB7AN6
廠商： NUMONYX
元件分類： PROM
英文描述： 2M X 16 FLASH 3V PROM, 70 ns, PDSO48
封裝： 12 X 20 MM, PLASTIC, TSOP-48
文件頁數(shù)： 43/56頁
文件大?。?/td> 1125K
代理商： M29W320DB7AN6
Block Protection
M29W320DT, M29W320DB
48/56
Appendix C
Block Protection
Block protection can be used to prevent any operation from modifying the data stored in the
Flash. Each Block can be protected individually. Once protected, Program and Erase
operations on the block fail to change the data.
There are three techniques that can be used to control Block Protection, these are the
Programmer technique, the In-System technique and Temporary Unprotection. Temporary
Unprotection is controlled by the Reset/Block Temporary Unprotection pin, RP; this is
described in the Signal Descriptions section.
Unlike the Command Interface of the Program/Erase Controller, the techniques for
protecting and unprotecting blocks change between different Flash memory suppliers. For
example, the techniques for AMD parts will not work on Numonyx parts. Care should be
taken when changing drivers for one part to work on another.
C.1
Programmer Technique
The Programmer technique uses high (VID) voltage levels on some of the bus pins. These
cannot be achieved using a standard microprocessor bus, therefore the technique is
recommended only for use in Programming Equipment.
To protect a block follow the flowchart in Figure 16: Programmer Equipment Block Protect
. To unprotect the whole chip it is necessary to protect all of the blocks first, then
all blocks can be unprotected at the same time. To unprotect the chip follow Figure 17:
, gives a summary of each operation.
The timing on these flowcharts is critical. Care should be taken to ensure that, where a
pause is specified, it is followed as closely as possible. Do not abort the procedure before
reaching the end. Chip Unprotect can take several seconds and a user message should be
provided to show that the operation is progressing.
C.2
In-System Technique
The In-System technique requires a high voltage level on the Reset/Blocks Temporary
Unprotect pin, RP. This can be achieved without violating the maximum ratings of the
components on the microprocessor bus, therefore this technique is suitable for use after the
Flash has been fitted to the system.
To protect a block follow the flowchart in Figure 18: In-System Equipment Block Protect
. To unprotect the whole chip it is necessary to protect all of the blocks first, then
all the blocks can be unprotected at the same time. To unprotect the chip follow Figure
The timing on these flowcharts is critical. Care should be taken to ensure that, where a
pause is specified, it is followed as closely as possible. Do not allow the microprocessor to
service interrupts that will upset the timing and do not abort the procedure before reaching
the end. Chip Unprotect can take several seconds and a user message should be provided
to show that the operation is progressing.
相關PDF資料
PDF描述
M30L40C-E3/4W 15 A, 40 V, SILICON, RECTIFIER DIODE, TO-220AB
M31012ABMNFREQ VCXO, CLOCK, 150 MHz - 1400 MHz, CMOS OUTPUT
M31002ABPNFREQ VCXO, CLOCK, 150 MHz - 1400 MHz, PECL OUTPUT
M31002BSLNFREQ VCXO, CLOCK, 150 MHz - 1400 MHz, LVDS OUTPUT
M31022AGPNFREQ VCXO, CLOCK, 150 MHz - 1400 MHz, PECL OUTPUT
相關代理商/技術參數(shù)
參數(shù)描述
M29W320DB7AN6E 制造商:Micron Technology Inc 功能描述:AUTOMOTIVE - Trays 制造商:Micron Technology Inc 功能描述:IC FLASH 32MBIT 70NS 48TSOP
M29W320DB7AN6F 制造商:Micron Technology Inc 功能描述:AUTOMOTIVE - Tape and Reel
M29W320DB7AN6F TR 制造商:Micron Technology Inc 功能描述:IC FLASH 32MBIT 70NS 48TSOP
M29W320DB7AZA3F 制造商:Micron Technology Inc 功能描述:AUTOMOTIVE - Tape and Reel
M29W320DB7AZA6E 制造商:Micron Technology Inc 功能描述:32MB 2MX16 NOR FLASH PLASTIC IND TEMP BOTTOM PBF TFBGA 3.0V - Trays 制造商:Micron Technology Inc 功能描述:IC FLASH 32MBIT 70NS 63TFBGA
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