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    參數(shù)資料
    型號: LFEC3E-3T100I
    廠商: LATTICE SEMICONDUCTOR CORP
    元件分類: FPGA
    英文描述: STANDOFF RND 4-40THR .625L BRS
    中文描述: FPGA, 384 CLBS, 3100 GATES, 420 MHz, PQFP100
    封裝: 14 X 14 MM, TQFP-100
    文件頁數(shù): 22/117頁
    文件大?。?/td> 557K
    代理商: LFEC3E-3T100I
    2-19
    Architecture
    Lattice Semiconductor
    LatticeECP/EC Family Data Sheet
    Table 2-8. An Example of Sign Extension
    OVERFLOW Flag from MAC
    The sysDSP block provides an over
    fl
    ow output to indicate that the accumulator has over
    fl
    owed. When two
    unsigned numbers are added and the result is a smaller number then accumulator roll over is said to occur and
    over
    fl
    ow signal is indicated. When two positive numbers are added with a negative sum and when two negative
    numbers are added with a positive sum, then the accumulator “roll-over” is said to have occurred and an over
    fl
    ow
    signal is indicated. Note when over
    fl
    ow occurs the over
    fl
    ow
    fl
    ag is present for only one cycle. By counting these
    over
    fl
    ow pulses in FPGA logic, larger accumulators can be constructed. The conditions over
    fl
    ow signal for signed
    and unsigned operands are listed in Figure 2-22.
    Figure 2-22. Accumulator Overflow/Underflow Conditions
    ispLEVER Module Manager
    The user can access the sysDSP block via the ispLEVER Module Manager, which has options to con
    fi
    gure each
    DSP module (or group of modules) or through direct HDL instantiation. Additionally Lattice has partnered Math-
    works to support instantiation in the Simulink tool, which is a Graphical Simulation Environment. Simulink works
    with ispLEVER and dramatically shortens the DSP design cycle in Lattice FPGAs.
    Number Unsigned
    +5
    -6
    Unsigned
    9-bit
    000000101
    000000110
    Unsigned
    18-bit
    Signed
    0101
    1010
    Two’s Complement
    Signed 9-Bits
    000000101
    111111010
    Two’s Complement
    Signed 18-bits
    000000000000000101
    111111111111111010
    0101
    0110
    000000000000000101
    000000000000000110
    000000000
    111111111
    000000001
    000000010
    000000011
    111111101
    111111110
    Overflow signal is generated
    for one cycle when this
    boundary is crossed
    0
    +1
    +2
    +3
    -3
    -2
    -1
    Unsigned Operation
    Signed Operation
    0101111111
    0101111110
    0101111101
    0101111100
    1010000010
    1010000001
    1010000000
    255
    254
    253
    252
    254
    255
    256
    000000000
    000000001
    000000010
    000000011
    111111101
    111111110
    111111111
    Carry signal is generated for
    one cycle when this
    boundary is crossed
    0
    1
    2
    3
    509
    510
    511
    0101111111
    1010000000
    0101111110
    0101111101
    0101111100
    1010000010
    1010000001
    255
    256
    254
    253
    252
    258
    257
    相關(guān)PDF資料
    PDF描述
    LFEC3E-3T144C LatticeECP/EC Family Data Sheet
    LFEC3E-3T144I LatticeECP/EC Family Data Sheet
    LFEC3E-4F256C LatticeECP/EC Family Data Sheet
    LFEC3E-4F256I LatticeECP/EC Family Data Sheet
    LFEC3E-4F484C LatticeECP/EC Family Data Sheet
    相關(guān)代理商/技術(shù)參數(shù)
    參數(shù)描述
    LFEC3E-3T100IES 功能描述:FPGA - 現(xiàn)場可編程門陣列 3.1 LUT 67 I/O RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-256
    LFEC3E-3T144C 功能描述:FPGA - 現(xiàn)場可編程門陣列 3.1K LUTs RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-256
    LFEC3E-3T144CES 功能描述:FPGA - 現(xiàn)場可編程門陣列 3.1 LUT 97 I/O RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-256
    LFEC3E-3T144I 功能描述:FPGA - 現(xiàn)場可編程門陣列 3.1K LUTs 97 IO 1.2V -3 Spd I RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-256
    LFEC3E-3T144IES 功能描述:FPGA - 現(xiàn)場可編程門陣列 3.1 LUT 97 I/O RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 柵極數(shù)量: 邏輯塊數(shù)量:943 內(nèi)嵌式塊RAM - EBR:1956 kbit 輸入/輸出端數(shù)量:128 最大工作頻率:800 MHz 工作電源電壓:1.1 V 最大工作溫度:+ 70 C 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-256