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    參數(shù)資料
    型號(hào): MPC180LMB
    廠(chǎng)商: FREESCALE SEMICONDUCTOR INC
    元件分類(lèi): 微控制器/微處理器
    英文描述: MICROPROCESSOR, PQFP100
    封裝: LQFP-100
    文件頁(yè)數(shù): 3/28頁(yè)
    文件大?。?/td> 356K
    代理商: MPC180LMB
    MOTOROLA
    MPC180 Hardware Reference Manual
    11
    PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
    Electrical and Thermal Characteristics
    6.5
    IEEE 1149.1 AC Timing Specication
    6.6 MPC180 and MPC8xx Timing Diagrams
    A write cycle is dened as a transfer of data to the MPC180 from the host processor and a read cycle is
    dened as a transfer of data from the MPC180 to the host processor. The processor initiates all data transfers,
    acting as the bus master, and the MPC180 always acts as the bus slave. Data transfer is synchronous to the
    main clock input and begins on the rising edge that TS and CS are asserted. At this time, the R/W signal
    indicates whether the transaction is a read or a write and the address bus is decoded to select the destination
    within the MPC180. The MPC180 holds the TA line high to signal the appropriate number of wait states and
    then drives the signal low to indicate that valid data is on the bus. If TA is driven low during a read cycle,
    the MPC180 is driving valid data; if TA is driven low during a write cycle, the MPC180 has captured valid
    data.
    Figure 4 shows a typical read cycle when the MPC180 interfaces to an MPC850 or MPC860 and Figure 5
    shows a typical write cycle for the same interface.
    Table 7. JTAG AC Timing Specications
    Condition
    Name
    Min
    Max
    Units
    TCK Cycle Time
    tTHTH
    60
    nS
    TCK Clock High Time
    tTH
    25
    nS
    TCK Clock Low Time
    tTL
    25
    nS
    TDO Access Time
    tTLQV
    110
    nS
    TRST pulse width
    tTSRT
    40
    nS
    Setup TImes
    Capture
    TDI
    TMS
    tCS
    tDVTH
    tMVTH
    5
    —nS
    Hold TImes
    Capture
    TDI
    TMS
    tCH
    tTHDX
    tTHMX
    13
    14
    —nS
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