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    參數(shù)資料
    型號: MPC8572ECVTAULE
    廠商: Freescale Semiconductor
    文件頁數(shù): 33/138頁
    文件大小: 0K
    描述: MPU POWERQUICC III 1023FCPBGA
    標(biāo)準(zhǔn)包裝: 1
    系列: MPC85xx
    處理器類型: 32-位 MPC85xx PowerQUICC III
    速度: 1.333GHz
    電壓: 1.1V
    安裝類型: 表面貼裝
    封裝/外殼: 1023-BBGA,F(xiàn)CBGA
    供應(yīng)商設(shè)備封裝: 1023-FCPBGA(33x33)
    包裝: 托盤
    MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
    128
    Freescale Semiconductor
    System Design Information
    Table 85 summarizes the signal impedance targets. The driver impedances are targeted at minimum VDD,
    nominal OVDD, 105°C.
    21.8
    Configuration Pin Muxing
    The MPC8572E provides the user with power-on configuration options which can be set through the use
    of external pull-up or pull-down resistors of 4.7 k
    Ω on certain output pins (see customer visible
    configuration pins). These pins are generally used as output only pins in normal operation.
    While HRESET is asserted however, these pins are treated as inputs. The value presented on these pins
    while HRESET is asserted, is latched when HRESET deasserts, at which time the input receiver is disabled
    and the I/O circuit takes on its normal function. Most of these sampled configuration pins are equipped
    with an on-chip gated resistor of approximately 20 k
    Ω. This value should permit the 4.7-kΩ resistor to pull
    the configuration pin to a valid logic low level. The pull-up resistor is enabled only during HRESET (and
    for platform /system clocks after HRESET deassertion to ensure capture of the reset value). When the input
    receiver is disabled the pull-up is also, thus allowing functional operation of the pin as an output with
    minimal signal quality or delay disruption. The default value for all configuration bits treated this way has
    been encoded such that a high voltage level puts the device into the default state and external resistors are
    needed only when non-default settings are required by the user.
    Careful board layout with stubless connections to these pull-down resistors coupled with the large value
    of the pull-down resistor should minimize the disruption of signal quality or speed for output pins thus
    configured.
    The platform PLL ratio, DDR complex PLL and e500 PLL ratio configuration pins are not equipped with
    these default pull-up devices.
    21.9
    JTAG Configuration Signals
    Correct operation of the JTAG interface requires configuration of a group of system control pins as
    demonstrated in Figure 66. Care must be taken to ensure that these pins are maintained at a valid deasserted
    state under normal operating conditions as most have asynchronous behavior and spurious assertion gives
    unpredictable results.
    Boundary-scan testing is enabled through the JTAG interface signals. The TRST signal is optional in the
    IEEE Std 1149.1 specification, but it is provided on all processors built on Power Architecture technology.
    The device requires TRST to be asserted during power-on reset flow to ensure that the JTAG boundary
    logic does not interfere with normal chip operation. While the TAP controller can be forced to the reset
    Table 85. Impedance Characteristics
    Impedance
    Local Bus, Ethernet, DUART,
    Control, Configuration, Power
    Management
    DDR DRAM
    Symbol
    Unit
    RN
    45 Target
    18 Target (full strength mode)
    36 Target (half strength mode)
    Z0
    Ω
    RP
    45 Target
    18 Target (full strength mode)
    36 Target (half strength mode)
    Z0
    Ω
    Note: Nominal supply voltages. See Table 1, Tj = 105°C.
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