參數(shù)資料
    型號: MC28U512HACA-0QC00
    廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
    英文描述: MultiMediaCard Specification
    中文描述: 多媒體卡規(guī)格
    文件頁數(shù): 44/66頁
    文件大?。?/td> 1422K
    代理商: MC28U512HACA-0QC00
    MultiMediaCard
    TM
    44
    3 = stby
    4 = tran
    5 = data
    6 = rcv
    7 = prg
    8 = dis
    9–15 = reserved
    ‘0’ = not ready
    ‘1’ = ready
    Permanently 0
    ‘0’ = disabled
    ‘1’ = enabled
    8
    EADY_FOR_DATA
    SX
    corresponds to buffer empty signaling on
    the bus
    A
    7:6
    5
    reserved
    APP_CMD
    SR
    The card will expect ACMD or indication
    that the command has been interpreted
    as ACMD.
    C
    4
    3:2
    1:0
    4.9.8 Command Response Timings
    All timing diagrams use the following schematics and abbreviations:
    S
    Start bit (= ‘0’)
    T
    Transmitter bit (Host = ‘1’, Card = ‘0’)
    P
    One-cycle pull-up (= ‘1’)
    E
    End bit (=1)
    Z
    High impedance state (-> = ‘1’)
    D
    Data bits
    *
    Repetition
    CRC
    Cyclic redundancy check bits (7 bits for command or
    response, 16 bits for block data)
    Card active
    Host active
    The difference between the P-bit and Z-bit is that a P-bit is actively driven to HIGH by the card
    respectively host output driver, while Z-bit is driven to (respectively kept) HIGH by the pull-up resistors
    R
    CMD
    respectively R
    DAT
    . Actively driven P-bits are less sensitive to noise superposition.
    Timing Values
    Min
    Max
    NCR
    2
    64
    NID
    5
    5
    10*(TAAC*Fop+1
    00*NSAC)
    NRC
    8
    --
    NCC
    8
    --
    NWR
    2
    --
    NST
    2
    2
    The host command and the card response are clocked out with the rising edge of the host clock. The
    delay between host command and card response is NCR clock cycles. The following timing diagram is
    relevant for host command CMD3 :
    reserved
    reserved for application specific commands
    reserved for manufacturer test mode
    Permanently 0
    Unit
    Clock cycles
    Clock cycles
    NAC
    2
    Clock cycles
    Clock cycles
    Clock cycles
    Clock cycles
    Clock cycles
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