參數(shù)資料
    型號(hào): OR3C804BA352-DB
    廠商: LATTICE SEMICONDUCTOR CORP
    元件分類: FPGA
    英文描述: FPGA, 484 CLBS, 116000 GATES, PBGA352
    封裝: PLASTIC, BGA-352
    文件頁數(shù): 24/203頁
    文件大?。?/td> 1368K
    代理商: OR3C804BA352-DB
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    12
    Lattice Semiconductor
    Data Sheet
    November 2006
    ORCA Series 3C and 3T FPGAs
    Programmable Logic Cells (continued)
    Table 4. Control Input Functionality
    Mode
    CLK
    LSR
    CE
    ASWE
    SEL
    Logic
    CLK to all latches/
    FFs
    LSR to all latches/
    FFs, enabled per nib-
    ble and for ninth FF
    CE to all latches/FFs,
    selectable per nibble
    and for ninth FF
    CE to all latches/FFs,
    selectable per nibble
    and for ninth FF
    Select between LUT
    input and direct input
    for eight latches/FFs
    Half Logic/
    Half Ripple
    CLK to all latches/
    FFs
    LSR to all latches/FF,
    enabled per nibble
    and for ninth FF
    CE to all latches/FFs,
    selectable per nibble
    and for ninth FF
    Ripple logic control
    input
    Select between LUT
    input and direct input
    for eight latches/FFs
    Ripple
    CLK to all latches/
    FFs
    LSR to all latches/
    FFs, enabled per nib-
    ble and for ninth FF
    CE to all latches/FFs,
    selectable per nibble
    and for ninth FF
    Ripple logic control
    input
    Select between LUT
    input and direct input
    for eight latches/FFs
    Memory
    (RAM)
    CLK to RAM
    Port enable 2
    Port enable 1
    Write enable
    Not used
    Memory
    (ROM)
    Optional for sync.
    outputs
    Not used
    Logic Mode
    The PFU diagram of Figure 3 represents the logic
    mode of operation. In logic mode, the eight LUTs are
    used individually or in exible groups to implement user
    logic functions. The latches/FFs may be used in con-
    junction with the LUTs or separately with the direct
    PFU data inputs. There are three basic submodes of
    LUT operation in PFU logic mode: F4 mode, F5 mode,
    and softwired LUT (SWL) mode. Combinations of these
    submodes are possible in each PFU.
    F4 mode, shown simplied in Figure 4, illustrates the
    uses of the basic 4-input LUTs in the PFU. The output
    of an F4 LUT can be passed out of the PFU, captured
    at the LUTs associated latch/FF, or multiplexed with the
    adjacent F4 LUT output using one of the F5[A:D] inputs
    to the PFU. Only adjacent LUT pairs (K0 and K1, K2
    and K3, K4 and K5, K6 and K7) can be multiplexed, and
    the output always goes to the even-numbered output of
    the pair.
    The F5 submode of the LUT operation, shown simpli-
    ed in Figure 4, indicates the use of 5-input LUTs to
    implement logic. 5-input LUTs are created from two
    4-input LUTs and a multiplexer. The F5 LUT is the
    same as the multiplexing of two F4 LUTs described
    previously with the constraint that the inputs to the F4
    LUTs be the same. The F5[A:D] input is then used as
    the fth LUT input. The equations for the two F4 LUTs
    will differ by the assumed value for the F5[A:D] input,
    one F4 LUT assuming that the F5[A:D] input is zero,
    and the other assuming it is a one. The selection of the
    appropriate F4 LUT output in the F5 MUX by the
    F5[A:D] signal creates a 5-input LUT. Any combination
    of F4 and F5 LUTs is allowed per PFU using the eight
    16-bit LUTs. Examples are eight F4 LUTs, four F5
    LUTs, and a combination of four F4 plus two F5 LUTs.
    5-5970(F)
    Figure 4. Simplied F4 and F5 Logic Modes
    K7
    F7
    K7
    F6
    K6
    F5D
    K6
    F6
    K5
    F5
    K5
    F4
    K4
    F5C
    K4
    F4
    K3
    F3
    K3
    F2
    K2
    F5B
    K2
    F2
    K1
    F1
    K1
    F0
    K0
    F5A
    K0
    F0
    K7/K6
    F6
    K5/K4
    F4
    K3/K2
    F2
    K1/K0
    F0
    F5 MODE
    MULTIPLEXED F4 MODE
    F4 MODE
    Select
    devices
    have
    been
    discontinued.
    See
    Ordering
    Information
    section
    for
    product
    status.
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