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  • 參數(shù)資料
    型號: X76F041AE
    英文描述: PASS TM SecureFlash
    中文描述: 密碼商標(biāo)SecureFlash
    文件頁數(shù): 8/21頁
    文件大?。?/td> 107K
    代理商: X76F041AE
    X76F041
    8
    ACK Polling
    Once a stop condition is issued to indicate the end of the
    host’s write sequence, the X76F041 initiates the internal
    nonvolatile write cycle. In order to take advantage of the
    typical 5ms write cycle, ACK polling can be initiated
    immediately. This involves issuing the Start condition fol-
    lowed by the new command code of eight bits (1st byte of
    the protocol). If the X76F041 is still busy with the nonvol-
    atile write operation, it will issue a “no ACK” in response.
    If the nonvolatile write operation has completed, an
    “ACK” will be returned and the host can then proceed
    with the rest of the protocol. Refer to the following flow:
    ACK Polling Sequence
    7002 ILL F12A
    WRITE SEQUENCE
    COMPLETED
    ENTER ACK POLLING
    ISSUE
    A START
    ISSUE NEW
    COMMAND CODE
    (1ST BYTE)
    ACK
    RETURNED
    PROCEED
    NO ACK (SDA HIGH)
    YES (SDA LOW)
    After a password sequence, there is always a nonvolatile
    write cycle. In order to continue the transaction, the
    X76F041 requires the master to perform an ACK polling
    with the specific code of C0h. As with regular acknowl-
    edge polling the user can either time out for 10ms, and
    then issue the ACK polling once, or continuously loop as
    described in the flow.
    As with regular acknowledge polling, if the user chooses
    to loop, then as long as the nonvolatile write cycle is
    active, a no ACK will be issued in response to each poll-
    ing cycle.
    If the password that was inserted was correct, then an
    “ACK” will be returned once the nonvolatile write cycle is
    over, in response to the ACK polling cycle immediately
    following it.
    If the password that was inserted was incorrect, then a
    “no ACK” will be returned even if the nonvolatile write
    cycle is over. Therefore, the user cannot be certain that
    the password is incorrect until the 10ms write cycle time
    has elapsed.
    Figure 7. Acknowledge Polling
    SCL
    SDA
    8th clk.
    of 8th
    pwd. byte
    ‘ACK’
    clk
    8th
    clk
    ACK
    clk
    8th
    bit
    ‘ACK’
    ACK or
    no ACK
    START
    condition
    7002 ILL F11
    相關(guān)PDF資料
    PDF描述
    X76F041H PASS TM SecureFlash
    X76F041H-3 PASS TM SecureFlash
    X76F041HE PASS TM SecureFlash
    X76F041P PASS TM SecureFlash
    X76F041P-3 PASS TM SecureFlash
    相關(guān)代理商/技術(shù)參數(shù)
    參數(shù)描述
    X76F041AE-3 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:PASS TM SecureFlash
    X76F041H 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:PASS TM SecureFlash
    X76F041H-3 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:PASS TM SecureFlash
    X76F041HE 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:PASS TM SecureFlash
    X76F041HE-3 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:PASS TM SecureFlash