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    參數(shù)資料
    型號: XCS20XL-4PQG208C
    廠商: Xilinx Inc
    文件頁數(shù): 17/83頁
    文件大?。?/td> 0K
    描述: IC SPARTAN-XL FPGA 20K 208-PQFP
    產(chǎn)品變化通告: Product Discontinuation 26/Oct/2011
    標(biāo)準(zhǔn)包裝: 24
    系列: Spartan®-XL
    LAB/CLB數(shù): 400
    邏輯元件/單元數(shù): 950
    RAM 位總計(jì): 12800
    輸入/輸出數(shù): 160
    門數(shù): 20000
    電源電壓: 3 V ~ 3.6 V
    安裝類型: 表面貼裝
    工作溫度: 0°C ~ 85°C
    封裝/外殼: 208-BFQFP
    供應(yīng)商設(shè)備封裝: 208-PQFP(28x28)
    其它名稱: 122-1292
    Spartan and Spartan-XL FPGA Families Data Sheet
    24
    DS060 (v2.0) March 1, 2013
    Product Specification
    R
    Product Obsolete/Under Obsolescence
    Even if the boundary scan symbol is used in a design, the
    input pins TMS, TCK, and TDI can still be used as inputs to
    be routed to internal logic. Care must be taken not to force
    the chip into an undesired boundary scan state by inadver-
    tently applying boundary scan input patterns to these pins.
    The simplest way to prevent this is to keep TMS High, and
    then apply whatever signal is desired to TDI and TCK.
    Avoiding Inadvertent Boundary Scan
    If TMS or TCK is used as user I/O, care must be taken to
    ensure that at least one of these pins is held constant during
    configuration. In some applications, a situation may occur
    where TMS or TCK is driven during configuration. This may
    cause the device to go into boundary scan mode and dis-
    rupt the configuration process.
    To prevent activation of boundary scan during configuration,
    do either of the following:
    TMS: Tie High to put the Test Access Port controller
    in a benign RESET state.
    TCK: Tie High or Low—do not toggle this clock input.
    For more information regarding boundary scan, refer to the
    Xilinx Application Note, "Boundary Scan in FPGA Devices. "
    Boundary Scan Enhancements (Spartan-XL Family
    Only)
    Spartan-XL devices have improved boundary scan func-
    tionality and performance in the following areas:
    IDCODE: The IDCODE register is supported. By using the
    IDCODE, the device connected to the JTAG port can be
    determined. The use of the IDCODE enables selective con-
    figuration dependent on the FPGA found.
    The IDCODE register has the following binary format:
    vvvv:ffff:fffa:aaaa:aaaa:cccc:cccc:ccc1
    where
    c = the company code (49h for Xilinx)
    a = the array dimension in CLBs (ranges from 0Ah for
    XCS05XL to 1Ch for XCS40XL)
    f = the family code (02h for Spartan-XL family)
    v = the die version number
    Configuration State: The configuration state is available to
    JTAG controllers.
    Configuration Disable: The JTAG port can be prevented
    from configuring the FPGA.
    TCK Startup: TCK can now be used to clock the start-up
    block in addition to other user clocks.
    CCLK Holdoff: Changed the requirement for Boundary
    Scan Configure or EXTEST to be issued prior to the release
    of INIT pin and CCLK cycling.
    Reissue Configure: The Boundary Scan Configure can be
    reissued to recover from an unfinished attempt to configure
    the device.
    Bypass FF: Bypass FF and IOB is modified to provide
    DRCLOCK only during BYPASS for the bypass flip-flop, and
    during EXTEST or SAMPLE/PRELOAD for the IOB register.
    Power-Down (Spartan-XL Family Only)
    All Spartan/XL devices use a combination of efficient seg-
    mented routing and advanced process technology to pro-
    vide low power consumption under all conditions. The 3.3V
    Spartan-XL family adds a dedicated active Low power-down
    pin (PWRDWN) to reduce supply current to 100
    μA typical.
    The PWRDWN pin takes advantage of one of the unused
    No Connect locations on the 5V Spartan device. The user
    must de-select the "5V Tolerant I/Os" option in the Configu-
    ration Options to achieve the specified Power Down current.
    The PWRDWN pin has a default internal pull-up resistor,
    allowing it to be left unconnected if unused.
    VCC must continue to be supplied during Power-down, and
    configuration data is maintained. When the PWRDWN pin is
    pulled Low, the input and output buffers are disabled. The
    inputs are internally forced to a logic Low level, including the
    MODE pins, DONE, CCLK, and TDO, and all internal
    pull-up resistors are turned off. The PROGRAM pin is not
    affected by Power Down. The GSR net is asserted during
    Power Down, initializing all the flip-flops to their start-up
    state.
    PWRDWN has a minimum pulse width of 50 ns (Figure 23).
    On entering the Power-down state, the inputs will be dis-
    abled and the flip-flops set/reset, and then the outputs are
    disabled about 10 ns later. The user may prefer to assert the
    GTS or GSR signals before PWRDWN to affect the order of
    events. When the PWRDWN signal is returned High, the
    inputs will be enabled first, followed immediately by the
    release of the GSR signal initializing the flip-flops. About 10
    ns later, the outputs will be enabled. Allow 50 ns after the
    release of PWRDWN before using the device.
    Table 13: IDCODEs Assigned to Spartan-XL FPGAs
    FPGA
    IDCODE
    XCS05XL
    0040A093h
    XCS10XL
    0040E093h
    XCS20XL
    00414093h
    XCS30XL
    00418093h
    XCS40XL
    0041C093h
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