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    參數(shù)資料
    型號: A40MX04-2VQ80I
    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): 11/116頁
    文件大小: 3110K
    代理商: A40MX04-2VQ80I
    v5.0
    11
    40MX and 42MX FPGA Families
    When a device is operating in BST mode, four I/O pins are
    used for the TDI, TDO, TMS, and TCK signals. An active
    reset (nTRST) pin is not supported; however, the 42MX
    device contain power-on circuitry that resets the boundary
    scan circuitry upon power-up.
    Table 1
    summarizes the
    functions of the IEEE 1149.1 BST signals.
    JTAG
    All SX-A devices are IEEE 1149.1 (JTAG) compliant. SX-A
    devices offer superior diagnostic and testing capabilities by
    providing JTAG and probing capabilites. These functions
    are controlled through the special JTAG pins in conjunction
    with the program fuse.
    JTAG fuse programmed:
    TCK must be terminated
    logical high or low doesn
    t
    matter (to avoid floating input)
    TDI, TMS may float or at logical high (internal pull-up is
    present)
    TDO may float or connect to TDI of another device (it
    s an
    output)
    JTAG fuse not programmed:
    TCK, TDI, TDO, TMS are user I/O. If not used, they will be
    configured as tristated output.
    BST Instructions
    Boundary scan testing within the 42MX devices is controlled
    by a Test Access Port (TAP) state machine. The TAP
    controller drives the three-bit instruction register, a bypass
    register, and the boundary scan data registers within the
    device. The TAP controller uses the TMS signal to control
    the testing of the device. The BST mode is determined by
    the bitstream entered on the TMS pin.
    Table 2
    describes the
    test instructions supported by the 42MX devices.
    Reset
    The TMS pin is equipped with an internal pull-up resistor.
    This allows the TAP controller to remain in or return to the
    Test-Logic-Reset state when there is no input or when a
    logical 1 is on the TMS pin. To reset the controller, TMS
    must be HIGH for at least five TCK cycles.
    Figure 11
    42MX IEEE 1149.1 Boundary Scan Circuitry
    JPROBE Register
    Boundary Scan Register
    Instruction
    Decode
    Control Logic
    TAP Controller
    Instruction
    Register
    Bypass
    Register
    TMS
    TCK
    TDI
    Output
    MUX
    TDO
    JTAG
    JTAG
    Table 1
    IEEE 1149.1 BST Signals
    Signal
    Name
    Function
    TDI
    Test Data In
    Serial data input for BST
    instructions and data. Data is
    shifted in on the rising edge of
    TCK.
    TDO
    Test Data
    Out
    Serial data output for BST
    instructions and test data.
    TMS
    Test Mode
    Select
    Serial data input for BST mode.
    Data is shifted in on the rising
    edge of TCK.
    TCK
    Test Clock
    Clock signal to shift the BST
    data into the device.
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