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  • 參數(shù)資料
    型號: SPC5200CVR400
    廠商: Freescale Semiconductor
    文件頁數(shù): 14/80頁
    文件大?。?/td> 0K
    描述: IC MPU 32BIT 400MHZ 272-PBGA
    標準包裝: 40
    系列: MPC52xx
    處理器類型: 32-位 MPC52xx PowerPC
    速度: 400MHz
    電壓: 1.5V
    安裝類型: 表面貼裝
    封裝/外殼: 272-BBGA
    供應商設備封裝: 272-PBGA(27x27)
    包裝: 托盤
    Electrical and Thermal Characteristics
    MPC5200 Data Sheet, Rev. 4
    Freescale Semiconductor
    21
    Figure 6. Timing Diagram—Standard SDRAM Memory Write Timing
    3.3.5.3
    Memory Interface Timing-DDR SDRAM Read Command
    The SDRAM Memory Controller uses an internally skewed clock for reading DDR memory. The
    programmable bits in the Reset Configuration Register used to account for unknown board delays are in
    the CDM module. The internal read clock can be delayed up to 3 ns under worst operating conditions in
    32 increments of 95 ps, (1.4 ns in 45 ps increments under best case operating conditions) by programming
    the CDM Reset Configuration Register tap delay bits. Note: These bits in the CDM Reset Configuration
    register are not ‘reset configured’ but have a hard coded reset value and are writable during operation.
    Table 19. Standard SDRAM Write Timing
    Sym
    Description
    Min
    Max
    Units
    SpecID
    tmem_clk
    MEM_CLK period
    7.5
    ns
    A5.8
    tvalid
    Control Signals, Address and MBA Valid
    after rising edge of MEM_CLK
    —tmem_clk*0.5+0.4
    ns
    A5.9
    thold
    Control Signals, Address and MBA Hold after
    rising edge of MEM_CLK
    tmem_clk*0.5
    ns
    A5.10
    DMvalid
    DQM valid after rising edge of MEM_CLK
    tmem_clk*0.25+0.4
    ns
    A5.11
    DMhold
    DQM hold after rising edge of Mem_clk
    tmem_clk*0.25-0.7
    ns
    A5.12
    datavalid
    MDQ valid after rising edge of MEM_CLK
    tmem_clk*0.75+0.4
    ns
    A5.13
    datahold
    MDQ hold after rising edge of MEM_CLK
    tmem_clk*0.75-0.7
    ns
    A5.14
    MEM_CLK
    Control Signals
    MDQ (Data)
    MA (Address)
    NOTE: Control Signals are composed of RAS, CAS, MEM_WE, MEM_CS, MEM_CS1 and CLK_EN
    Active
    NOP
    WRITE
    NOP
    thold
    Row
    Column
    MBA (Bank Selects)
    datahold
    datavalid
    tvalid
    thold
    tvalid
    thold
    tvalid
    DQM (Data Mask)
    DMvalid
    DMhold
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