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    參數(shù)資料
    型號: OR2C12A-6T352
    廠商: Electronic Theatre Controls, Inc.
    元件分類: FPGA
    英文描述: Field-Programmable Gate Arrays
    中文描述: 現(xiàn)場可編程門陣列
    文件頁數(shù): 160/192頁
    文件大?。?/td> 3148K
    代理商: OR2C12A-6T352
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    Lucent Technologies Inc.
    7
    Data Sheet
    June 1999
    ORCA Series 2 FPGAs
    Programmable Logic Cells (continued)
    Table 3 lists the basic operating modes of the LUT. The
    operating mode affects the functionality of the PFU
    input and output ports and internal PFU routing. For
    example, in some operating modes, the WD[3:0] inputs
    are direct data inputs to the PFU latches/FFs. In the
    dual 16 x 2 memory mode, the same WD[3:0] inputs
    are used as a 4-bit data input bus into LUT memory.
    The PFU is used in a variety of modes, as illustrated in
    Figures 4 through 11, and it is these specific modes
    that are most relevant to PFU functionality.
    PFU Control Inputs
    The four control inputs to the PFU are clock (CK), local
    set/reset (LSR), clock enable (CE), and C0. The CK,
    CE, and LSR inputs control the operation of all four
    latches in the PFU. An active-low global set/reset
    (GSRN) signal is also available to the latches/FFs in
    every PFU. Their operation is discussed briefly here,
    and in more detail in the Latches/Flip-Flops section.
    The polarity of the control inputs can be inverted.
    The CK input is distributed to each PFU from a vertical
    or horizontal net. The CE input inhibits the latches/FFs
    from responding to data inputs. The CE input can be
    disabled, always enabling the clock. Each latch/FF can
    be independently programmed to be set or reset by the
    LSR and the global set/reset (GSRN) signals. Each
    PFU’s LSR input can be configured as synchronous or
    asynchronous. The GSRN signal is always asynchro-
    nous. The LSR signal applies to all four latches/FFs in
    a PFU. The LSR input can be disabled (the default).
    The asynchronous set/reset is dominant over clocked
    inputs.
    The C0 input is used as an input into the special PFU
    gates for wide functions in combinatorial logic mode.
    In the memory modes, this input is also used as the
    write-port enable input. The C0 input can be disabled
    (the default).
    Look-Up Table Operating Modes
    The look-up table (LUT) can be configured to operate
    in one of three general modes:
    s
    Combinatorial logic mode
    s
    Ripple mode
    s
    Memory mode
    The combinatorial logic mode uses a 64-bit look-up
    table to implement Boolean functions. The two 5-bit
    logic inputs, A[4:0] and B[4:0], and the C0 input are
    used as LUT inputs. The use of these ports changes
    based on the PFU operating mode.
    The functionality of the LUT is determined by its operat-
    ing mode. The entries in Table 3 show the basic modes
    of operation for combinatorial logic, ripple, and memory
    functions in the LUT. Depending on the operating
    mode, the LUT can be divided into sub-LUTs. The LUT
    is comprised of two 32-bit half look-up tables, HLUTA
    and HLUTB. Each half look-up table (HLUT) is com-
    prised of two quarter look-up tables (QLUTs). HLUTA
    consists of QLUT2 and QLUT3, while HLUTB consists
    of QLUT0 and QLUT1. The outputs of QLUT0, QLUT1,
    QLUT2, and QLUT3 are F0, F1, F2, and F3, respec-
    tively.
    Table 3. Look-Up Table Operating Modes
    For combinatorial logic, the LUT can be used to do any
    single function of six inputs, any two functions of five
    inputs, or four functions of four inputs (with some inputs
    shared), and three special functions based on the two
    five-input functions and C0.
    Mode
    Function
    F4A
    Two functions of four inputs, some inputs
    shared (QLUT2/QLUT3)
    F4B
    Two functions of four inputs, some inputs
    shared (QLUT0/QLUT1)
    F5A
    One function of five inputs (HLUTA)
    F5B
    One function of five inputs (HLUTB)
    R
    4-bit ripple (LUT)
    MA
    16 x 2 asynchronous memory (HLUTA)
    MB
    16 x 2 asynchronous memory (HLUTB)
    SSPM 16 x 4 synchronous single-port memory
    SDPM 16 x 2 synchronous dual-port memory
    相關(guān)PDF資料
    PDF描述
    OR2C12A-6T352I Field-Programmable Gate Arrays
    OR2C12A-6T84I Field-Programmable Gate Arrays
    OR2C12A-7BA208 Field-Programmable Gate Arrays
    OR2C12A-7J352 Field-Programmable Gate Arrays
    OR2C12A-7J352I Field-Programmable Gate Arrays
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