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    參數(shù)資料
    型號(hào): 20-101-0405
    廠商: Rabbit Semiconductor
    文件頁(yè)數(shù): 46/80頁(yè)
    文件大小: 0K
    描述: MODULE RABBITCORE RCM2010
    標(biāo)準(zhǔn)包裝: 1
    系列: RabbitCore®
    模塊/板類(lèi)型: MPU 核心模塊
    適用于相關(guān)產(chǎn)品: RCM2010
    產(chǎn)品目錄頁(yè)面: 620 (CN2011-ZH PDF)
    其它名稱(chēng): 316-1084
    46
    RabbitCore RCM2000
    A.2 Bus Loading
    You must pay careful attention to bus loading when designing an interface to the RCM2000.
    This
    section provides bus loading for external devices.
    Table A-2 lists the capacitance for the various RCM2000 I/O ports.
    Table A-3 lists the external capacitive bus loading for the various Rabbit 2000 output
    ports. Be sure to add the loads for the devices you are using in your custom system and
    verify that they do not exceed the values in Table A-3.
    Table A-2. Capacitance of RCM2000 I/O Ports
    I/O Ports
    Input Capacitance
    (pF)
    Output Capacitance
    (pF)
    Typ.
    Max.
    Typ.
    Max.
    Parallel Ports A to E
    6 pF
    12 pF
    10 pF
    14 pF
    Data Lines D0–D7
    16 pF
    30 pF
    24 pF
    32 pF
    Address Lines A0–A12
    24 pF
    32 pF
    Table A-3. External Capacitive Bus Loading -40°C to +85°C
    Output Port
    Clock Speed
    (MHz)
    Maximum External
    Capacitive Loading (pF)
    A[12:1]
    D[7:1]
    25.8
    50
    A[12:1]
    D[7:1]
    18.4
    55 for 90 ns flash
    100 for 55 ns flash*
    * The RCM2020 operating at 18.4 MHz will typically come with a
    flash EPROM whose access time is 55 ns. Because of the volatil-
    ity of the memory market, a 90 ns flash EPROM could be used on
    the RCM2020.
    A0
    D0
    25.8, 18.4
    100
    PD[3:0]
    25.8, 18.4,
    100
    PA[7:0]
    PB[7,6]
    PC[6,4,2,0]
    PD[7:4]
    PE[7:0]
    25.8, 18.4
    90
    All data, address, and I/O
    lines with clock doubler
    disabled
    12.9, 9.2
    100
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