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    參數(shù)資料
    型號: MC8640DHX1250HE
    廠商: FREESCALE SEMICONDUCTOR INC
    元件分類: 微控制器/微處理器
    英文描述: 32-BIT, 1250 MHz, MICROPROCESSOR, CBGA1023
    封裝: 33 X 33 MM, CERAMIC, FCBGA-1023
    文件頁數(shù): 41/130頁
    文件大?。?/td> 1495K
    代理商: MC8640DHX1250HE
    MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
    18
    Freescale Semiconductor
    RESET Initialization
    Note that at MPX = 400 MHz, cfg_plat_freq = 0 and at MPX > 400 MHz, cfg_plat_freq = 1. Therefore,
    when operating PCI Express in x8 link width, the MPX platform frequency must be 400 MHz with
    cfg_plat_freq = 0 or greater than or equal to 527 MHz with cfg_plat_freq = 1.
    For proper Serial RapidIO operation, the MPX clock frequency must be greater than:
    2 × (0.80) × (Serial RapidIO interface frequency) × (Serial RapidIO link width)
    64
    4.5
    Other Input Clocks
    For information on the input clocks of other functional blocks of the platform such as SerDes, and eTSEC,
    see the specific section of this document.
    5
    RESET Initialization
    This section describes the AC electrical specifications for the RESET initialization timing requirements of
    the MPC8640. Table 11 provides the RESET initialization AC timing specifications.
    Table 12 provides the PLL lock times.
    Table 11. RESET Initialization Timing Specifications
    Parameter
    Min
    Max
    Unit
    Notes
    Required assertion time of HRESET
    100
    μs—
    Minimum assertion time for SRESET_0 & SRESET_1
    3
    SYSCLKs
    1
    Platform PLL input setup time with stable SYSCLK before HRESET
    negation
    100
    μs2
    Input setup time for POR configs (other than PLL config) with respect to
    negation of HRESET
    4
    SYSCLKs
    1
    Input hold time for all POR configs (including PLL config) with respect to
    negation of HRESET
    2
    SYSCLKs
    1
    Maximum valid-to-high impedance time for actively driven POR configs
    with respect to negation of HRESET
    5
    SYSCLKs
    1
    Notes:
    1. SYSCLK is the primary clock input for the MPC8640.
    2 This is related to HRESET assertion time. Stable PLL configuration inputs are required when a stable SYSCLK is applied. See
    the
    MPC8641D Integrated Host Processor Reference Manual for more details on the power-on reset sequence.
    Table 12. PLL Lock Times
    Parameter
    Min
    Max
    Unit
    Notes
    (Platform and E600) PLL lock times
    100
    μs1
    Local bus PLL
    50
    μs—
    Notes:
    1.The PLL lock time for e600 PLLs require an additional 255 MPX_CLK cycles.
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