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PM25LD512 数据表(PDF) 7 Page - List of Unclassifed Manufacturers

部件名 PM25LD512
功能描述  512Kbit/1 Mbit / 2 Mbit Single Operating Voltage Serial Flash Memory With 100 MHz Dual-Output SPI Bus
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制造商  ETC2 [List of Unclassifed Manufacturers]
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标志 ETC2 - List of Unclassifed Manufacturers

PM25LD512 数据表(HTML) 7 Page - List of Unclassifed Manufacturers

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Pm25LD512/010/ 020
Confidential information
Chingis Technology Corp.
7
DRAFT Date: August, 2010, Rev:0.4
REGISTERS (CONTINUED)
STATUS REGISTER
Refer to Tables 5 and 6 for Status Register Format and
Status Register Bit Definitions.
The BP0, BP1, BP2, and SRWD are volatile memory
cells that can be written by a Write Status Register
(WRSR) instruction. The default value of the BP2, BP1,
BP0 were set to “0” and SRWD bits was set to “0” at
factory. Once a “0” or “1”is written, it will not be
changed by device power-up or power-down, and can
only be altered by the next WRSR instruction. The
Status Register can be read by the Read Status
Register (RDSR). Refer to Table 10 for Instruction Set.
The function of Status Register bits are described as
follows:
WIP bit: The Write In Progress (WIP) bit is read-only,
and can be used to detect the progress or completion
of a program or erase operation. When the WIP bit is
“0”, the device is ready for a write status register,
program or erase operation. When the WIP bit is “1”,
the device is busy.
WEL bit: The Write Enable Latch (WEL) bit indicates
the status of the internal write enable latch. When the
WEL is “0”, the write enable latch is disabled, and all
write operations, including write status register, page
program, sector erase, block and chip erase operations
are inhibited. When the WEL bit is “1”, write operations
are allowed. The WEL bit is set by a Write Enable
(WREN) instruction. Each write register, program and
erase instruction must be preceded by a WREN
instruction. The WEL bit can be reset by a Write
Disable (WRDI) instruction. It will automatically be the
reset after the completion of a write instruction.
BP2, BP1, BP0 bits: The Block Protection (BP2, BP1,
BP0) bits are used to define the portion of the memory
area to be protected. Refer to Tables 7, 8 and 9 for the
Block Write Protection bit settings. When a defined
combination of BP2, BP1 and BP0 bits are set, the
corresponding memory area is protected. Any program
or erase operation to that area will be inhibited. Note:
a Chip Erase (CHIP_ER) instruction is executed
successfully only if all the Block Protection Bits are set
as “0”s.
SRWD bit: The Status Register Write Disable (SRWD)
bit operates in conjunction with the Write Protection
(WP#) signal to provide a Hardware Protection Mode.
When the SRWD is set to “0”, the Status Register is
not write-protected. When the SRWD is set to “1” and
the WP# is pulled low (VIL), the volatile bits of Status
Register (SRWD, BP2, BP1, BP0) become read-only,
and a WRSR instruction will be ignored. If the SRWD is
set to “1” and WP# is pulled high (VIH), the Status
Register can be changed by a WRSR instruction.
Table 5. Status Register Format
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
SRWD1
Reserved
BP2
BP1
BP0
WEL
WIP
Default (flash bit)
0
0
0
0
0
0
0


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