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    參數(shù)資料
    型號: XC4005E-4PQ100C
    廠商: Xilinx Inc
    文件頁數(shù): 37/68頁
    文件大?。?/td> 0K
    描述: IC FPGA C-TEMP 5V 4-SPD 100-PQFP
    產(chǎn)品變化通告: Product Discontinuation 28/Jul/2010
    標(biāo)準(zhǔn)包裝: 66
    系列: XC4000E/X
    LAB/CLB數(shù): 196
    邏輯元件/單元數(shù): 466
    RAM 位總計: 6272
    輸入/輸出數(shù): 77
    門數(shù): 5000
    電源電壓: 4.75 V ~ 5.25 V
    安裝類型: 表面貼裝
    工作溫度: 0°C ~ 85°C
    封裝/外殼: 100-BQFP
    供應(yīng)商設(shè)備封裝: 100-QFP(14x20)
    R
    XC4000E and XC4000X Series Field Programmable Gate Arrays
    6-46
    May 14, 1999 (Version 1.6)
    Conguration Modes
    XC4000E devices have six conguration modes. XC4000X
    devices have the same six modes, plus an additional con-
    guration mode. These modes are selected by a 3-bit input
    code applied to the M2, M1, and M0 inputs. There are three
    self-loading Master modes, two Peripheral modes, and a
    Serial
    Slave
    mode,
    which
    is
    used
    primarily
    for
    daisy-chained devices. The coding for mode selection is
    shown in Table 18.
    A detailed description of each conguration mode, with tim-
    ing information, is included later in this data sheet. During
    conguration, some of the I/O pins are used temporarily for
    the conguration process. All pins used during congura-
    tion are shown in Table 22 on page 58.
    Master Modes
    The three Master modes use an internal oscillator to gener-
    ate a Conguration Clock (CCLK) for driving potential slave
    devices. They also generate address and timing for exter-
    nal PROM(s) containing the conguration data.
    Master Parallel (Up or Down) modes generate the CCLK
    signal and PROM addresses and receive byte parallel data.
    The data is internally serialized into the FPGA data-frame
    format. The up and down selection generates starting
    addresses at either zero or 3FFFF (3FFFFF when 22
    address lines are used), for compatibility with different
    microprocessor addressing conventions. The Master Serial
    mode generates CCLK and receives the conguration data
    in serial form from a Xilinx serial-conguration PROM.
    CCLK speed is selectable as either 1 MHz (default) or 8
    MHz. Conguration always starts at the default slow fre-
    quency, then can switch to the higher frequency during the
    rst frame. Frequency tolerance is -50% to +25%.
    Additional Address lines in XC4000 devices
    The XC4000X devices have additional address lines
    (A18-A21) allowing the additional address space required
    to daisy-chain several large devices.
    The extra address lines are programmable in XC4000EX
    devices. By default these address lines are not activated. In
    the default mode, the devices are compatible with existing
    XC4000 and XC4000E products. If desired, the extra
    address lines can be used by specifying the address lines
    option in bitgen as 22 (bitgen -g AddressLines:22). The
    lines (A18-A21) are driven when a master device detects,
    via the bitstream, that it should be using all 22 address
    lines. Because these pins will initially be pulled high by
    internal pull-ups, designers using Master Parallel Up mode
    should use external pull down resistors on pins A18-A21. If
    Master Parallel Down mode is used external resistors are
    not necessary.
    All 22 address lines are always active in Master Parallel
    modes with XC4000XL devices. The additional address
    lines behave identically to the lower order address lines. If
    the Address Lines option in bitgen is set to 18, it will be
    ignored by the XC4000XL device.
    The additional address lines (A18-A21) are not available in
    the PC84 package.
    Peripheral Modes
    The two Peripheral modes accept byte-wide data from a
    bus. A RDY/BUSY status is available as a handshake sig-
    nal. In Asynchronous Peripheral mode, the internal oscilla-
    tor generates a CCLK burst signal that serializes the
    byte-wide data. CCLK can also drive slave devices. In the
    synchronous mode, an externally supplied clock input to
    CCLK serializes the data.
    Slave Serial Mode
    In Slave Serial mode, the FPGA receives serial congura-
    tion data on the rising edge of CCLK and, after loading its
    conguration, passes additional data out, resynchronized
    on the next falling edge of CCLK.
    Multiple slave devices with identical congurations can be
    wired with parallel DIN inputs. In this way, multiple devices
    can be congured simultaneously.
    Serial Daisy Chain
    Multiple devices with different congurations can be con-
    nected together in a “daisy chain,” and a single combined
    bitstream used to congure the chain of slave devices.
    To congure a daisy chain of devices, wire the CCLK pins
    of all devices in parallel, as shown in Figure 51 on page
    60. Connect the DOUT of each device to the DIN of the
    next. The lead or master FPGA and following slaves each
    passes resynchronized conguration data coming from a
    single source. The header data, including the length count,
    Table 18: Conguration Modes
    Mode
    M2
    M1
    M0
    CCLK
    Data
    Master Serial
    0
    output
    Bit-Serial
    Slave Serial
    1
    input
    Bit-Serial
    Master
    Parallel Up
    1
    0
    output
    Byte-Wide,
    increment
    from 00000
    Master
    Parallel Down
    1
    0
    output
    Byte-Wide,
    decrement
    from 3FFFF
    Peripheral
    Synchronous*
    0
    1
    input
    Byte-Wide
    Peripheral
    Asynchronous
    1
    0
    1
    output
    Byte-Wide
    Reserved
    0
    1
    0
    Reserved
    0
    1
    * Can be considered byte-wide Slave Parallel
    Product Obsolete or Under Obsolescence
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