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    參數(shù)資料
    型號: XC5206-6PQ160I
    英文描述: Field Programmable Gate Array (FPGA)
    中文描述: 現(xiàn)場可編程門陣列(FPGA)
    文件頁數(shù): 30/73頁
    文件大?。?/td> 598K
    代理商: XC5206-6PQ160I
    R
    XC5200 Series Field Programmable Gate Arrays
    7-112
    November 5, 1998 (Version 5.2)
    DONE High to active user I/O is controlled by an option to
    the bitstream generation software.
    Release of Global Reset After DONE Goes High
    By default, Global Reset (GR) is released two CCLK cycles
    after the DONE pin goes High. If CCLK is not clocked twice
    after DONE goes High, all flip-flops are held in their initial
    reset state. The delay from DONE High to GR inactive is
    controlled by an option to the bitstream generation soft-
    ware.
    Configuration Complete After DONE Goes High
    Three full CCLK cycles are required after the DONE pin
    goes High, as shown in
    Figure 25 on page 109
    . If CCLK is
    not clocked three times after DONE goes High, readback
    cannot be initiated and most boundary scan instructions
    cannot be used.
    Configuration Through the Boundary Scan
    Pins
    XC5200-Series devices can be configured through the
    boundary scan pins.
    For detailed information, refer to the Xilinx application note
    XAPP017, “
    Boundary Scan in XC4000 and XC5200
    Devices
    .”
    Readback
    The user can read back the content of configuration mem-
    ory and the level of certain internal nodes without interfer-
    ing with the normal operation of the device.
    Readback not only reports the downloaded configuration
    bits, but can also include the present state of the device,
    represented by the content of all flip-flops and latches in
    CLBs.
    DONE
    *
    *
    *
    *
    *
    *
    Q
    S
    R
    1
    0
    0
    1
    1
    0
    1
    0
    1
    0
    0
    1
    GR ENABLE
    STARTUP.GR
    STARTUP.GTS
    GTS INVERT
    GTS ENABLE
    CONTROLLED BY STARTUP SYMBOL
    IN THE USER SCHEMATIC (SEE
    LIBRARIES GUIDE)
    GLOBAL RESET OF
    ALL CLB FLIP-FLOPS/LATCHES
    IOBs OPERATIONAL PER CONFIGURATION
    GLOBAL 3-STATE OF ALL IOBs
    Q2
    Q3
    Q1/Q4
    DONE
    IN
    STARTUP
    Q0
    Q1
    Q2
    Q3
    Q4
    M
    M
    " FINISHED "
    ENABLES BOUNDARY
    SCAN, READBACK AND
    CONTROLS THE OSCILLATOR
    K
    S
    Q
    K
    D
    Q
    K
    D
    Q
    K
    D
    Q
    K
    D
    Q
    FULL
    LENGTH COUNT
    CLEAR MEMORY
    CCLK
    STARTUP.CLK
    USER NET
    CONFIGURATION BIT OPTIONS SELECTED BY USER
    X9002
    Figure 26: Start-up Logic
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