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  • 參數(shù)資料
    型號: S25FL002D0FMFI003
    廠商: SPANSION LLC
    元件分類: DRAM
    英文描述: 2 Megabit, 1 Megabit CMOS 3.0 Volt Flash Memory with 25 MHz SPI Bus Interface
    中文描述: 2M X 1 SPI BUS SERIAL EEPROM, PDSO8
    封裝: 0.150 INCH, LEAD FREE, PLASTIC, MS-012AA, SO-8
    文件頁數(shù): 9/38頁
    文件大?。?/td> 892K
    代理商: S25FL002D0FMFI003
    June 9, 2004 30167A+1
    S25FL Family (Serial Peripheral Interface)
    9
    P r e l i m i n a r y I n f o r m a t i o n
    Operating Features
    All data into and out of the device is shifted in 8-bit chunks.
    Page Programming
    To program one data byte, two instructions are required: Write Enable (WREN),
    which is one byte, and a Page Program (PP) sequence, which consists of four
    bytes plus data. This is followed by the internal Program cycle. To spread this
    overhead, the Page Program (PP) instruction allows up to 256 bytes to be pro-
    grammed at a time (changing bits from 1 to 0), provided that they lie in
    consecutive addresses on the same page of memory.
    Sector Erase, or Bulk Erase
    The Page Program (PP) instruction allows bits to be programmed from 1 to 0. Be-
    fore this can be applied, the bytes of the memory need to be first erased to all
    1’s (FFh) before any programming. This can be achieved in two ways: 1) a sector
    at a time using the Sector Erase (SE) instruction, or 2) throughout the entire
    memory, using the Bulk Erase (BE) instruction.
    Polling During a Write, Program, or Erase Cycle
    A further improvement in the time to Write Status Register (WRSR), Program (PP)
    or Erase (SE or BE) can be achieved by not waiting for the worst-case delay. The
    Write in Progress (WIP) bit is provided in the Status Register so that the applica-
    tion program can monitor its value, polling it to establish when the previous Write
    cycle, Program cycle, or Erase cycle is complete.
    Active Power and Standby Power Modes
    When Chip Select (CS#) is Low, the device is enabled, and in the Active Power
    mode. When Chip Select (CS#) is High, the device is disabled, but could remain
    in the Active Power mode until all internal cycles have completed (Program,
    Erase, Write Status Register). The device then goes into the Standby Power
    mode. The device consumption drops to I
    SB
    . This can be used as an extra soft-
    ware protection mechanism, when the device is not in active use, to protect the
    device from inadvertent Write, Program, or Erase instructions.
    Status Register
    The Status Register contains a number of status and control bits, as shown in
    Fig-
    ure 7
    , that can be read or set (as appropriate) by specific instructions
    WIP bit:
    The Write In Progress (WIP) bit indicates whether the memory is
    busy with a Write Status Register, Program or Erase cycle.
    WEL bit:
    The Write Enable Latch (WEL) bit indicates the status of the internal
    Write Enable Latch.
    BP1, BP0 bits:
    The Block Protect (BP1, BP0) bits are non-volatile. They de-
    fine the size of the area to be software protected against Program and Erase
    instructions.
    SRWD bit:
    The Status Register Write Disable (SRWD) bit is operated in con-
    junction with the Write Protect (W#) signal. The Status Register Write Disable
    (SRWD) bit and Write Protect (W#) signal allow the device to be put in the
    Hardware Protected mode. In this mode, the non-volatile bits of the Status
    Register (SRWD, BP1, BP0) become read-only bits.
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