參數資料
    型號: LFECP15E-4F484I
    廠商: LATTICE SEMICONDUCTOR CORP
    元件分類: FPGA
    英文描述: LatticeECP/EC Family Data Sheet
    中文描述: FPGA, 1920 CLBS, 15400 GATES, 420 MHz, PBGA484
    封裝: 23 X 23 MM, FPBGA-484
    文件頁數: 6/117頁
    文件大?。?/td> 557K
    代理商: LFECP15E-4F484I
    2-3
    Architecture
    Lattice Semiconductor
    LatticeECP/EC Family Data Sheet
    PFU and PFF Blocks
    The core of the LatticeECP/EC devices consists of PFU and PFF blocks. The PFUs can be programmed to perform
    Logic, Arithmetic, Distributed RAM and Distributed ROM functions. PFF blocks can be programmed to perform
    Logic, Arithmetic and ROM functions. Except where necessary, the remainder of the data sheet will use the term
    PFU to refer to both PFU and PFF blocks.
    Each PFU block consists of four interconnected slices, numbered 0-3 as shown in Figure 2-3. All the interconnec-
    tions to and from PFU blocks are from routing. There are 53 inputs and 25 outputs associated with each PFU block.
    Figure 2-3. PFU Diagram
    Slice
    Each slice contains two LUT4 lookup tables feeding two registers (programmed to be in FF or Latch mode), and
    some associated logic that allows the LUTs to be combined to perform functions such as LUT5, LUT6, LUT7 and
    LUT8. There is control logic to perform set/reset functions (programmable as synchronous/asynchronous), clock
    select, chip-select and wider RAM/ROM functions. Figure 2-4 shows an overview of the internal logic of the slice.
    The registers in the slice can be con
    fi
    gured for positive/negative and edge/level clocks.
    There are 14 input signals: 13 signals from routing and one from the carry-chain (from adjacent slice or PFU).
    There are 7 outputs: 6 to routing and one to carry-chain (to adjacent PFU). Table 2-1 lists the signals associated
    with each slice.
    Slice 0
    LUT4 &
    CARRY
    LUT4 &
    CARRY
    FF/
    Latch
    D
    FF/
    Latch
    D
    Slice 1
    LUT4 &
    CARRY
    LUT4 &
    CARRY
    Slice 2
    LUT4 &
    CARRY
    LUT4 &
    CARRY
    From
    Routing
    To
    Routing
    Slice 3
    LUT4 &
    CARRY
    LUT4 &
    CARRY
    FF/
    Latch
    D
    FF/
    Latch
    D
    FF/
    Latch
    D
    FF/
    Latch
    D
    FF/
    Latch
    D
    FF/
    Latch
    D
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