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    參數(shù)資料
    

    


    


    
型號(hào)：
XCS05XL-5PC84C

    

    
英文描述：
Field Programmable Gate Array (FPGA)

    

    
中文描述：
現(xiàn)場(chǎng)可編程門陣列（FPGA）

    

    
文件頁(yè)數(shù)：
8/66頁(yè)

    

    
文件大?。?/td>
809K

    

    
代理商：
XCS05XL-5PC84C


    

    

    

	
    
    
    

    
    
	
    R
    Spartan and Spartan-XL Families Field Programmable Gate Arrays
    4-8
    DS060 (v1.5) March 2, 2000
    When configured as a multiplexer, this feature allows two
    output signals to time-share the same output pad, effec-
    tively doubling the number of device outputs without requir-
    ing a larger, more expensive package. The select input is
    the pin used for the output flip-flop clock, OK.
    When the multiplexer is configured as a 2-input function
    generator, logic can be implemented within the IOB itself.
    Combined with a Global buffer, this arrangement allows
    very high-speed gating of a single signal. For example, a
    wide decoder can be implemented in CLBs, and its output
    gated with a Read or Write Strobe driven by a global buffer.
    The user can specify that the IOB function generator be
    used by placing special library symbols beginning with the
    letter "O." For example, a 2-input AND gate in the IOB func-
    tion generator is called OAND2. Use the symbol input pin
    labeled "F" for the signal on the critical path. This signal is
    placed on the OK pin 
    —
     the IOB input with the shortest
    delay to the function generator. Two examples are shown in
    Figure 7
    .
    Output Buffer
    An active High 3-state signal can be used to place the out-
    put buffer in a high-impedance state, implementing 3-state
    outputs or bidirectional I/O. Under configuration control, the
    output (O) and output 3-state (T) signals can be inverted.
    The polarity of these signals is independently configured for
    each IOB (see 
    Figure 5 on page 6
    ). An output can be con-
    figured as open-drain (open-collector) by tying the 3-state
    pin (T) to the output signal, and the input pin (I) to Ground.
    By default, a 5V Spartan device output buffer pull-up struc-
    ture is configured as a TTL-like totem-pole. The High driver
    is an n-channel pull-up transistor, pulling to a voltage one
    transistor threshold below V
    CC
    . Alternatively, the outputs
    can be globally configured as CMOS drivers, with addi-
    tional p-channel pull-up transistors pulling to V
    CC
    . This
    option, applied using the bitstream generation software,
    applies to all outputs on the device. It is not individually pro-
    grammable. 
    All Spartan-XL device outputs are configured as CMOS
    drivers, therefore driving rail-to-rail. The Spartan-XL out-
    puts are individually programmable for 12 mA or 24 mA out-
    put drive.
    Any 5V Spartan device with its outputs configured in TTL
    mode can drive the inputs of any typical 3.3V device. Sup-
    ported destinations for Spartan/XL device outputs are
    shown in 
    Table 7
    .
    Three-State Register (Spartan-XL Only)
    Spartan-XL devices incorporate an optional register con-
    trolling the three-state enable in the IOBs. The use of the
    three-state control register can significantly improve output
    enable and disable time.
    Output Slew Rate
    The slew rate of each output buffer is, by default, reduced,
    to minimize power bus transients when switching non-criti-
    cal signals. For critical signals, attach a FAST attribute or
    property to the output buffer or flip-flop.
    Spartan/XL devices have a feature called "Soft Start-up,"
    designed to reduce ground bounce when all outputs are
    turned on simultaneously at the end of configuration.
    When the configuration process is finished and the device
    starts up, the first activation of the outputs is automatically
    slew-rate limited. Immediately following the initial activation
    of the I/O, the slew rate of the individual outputs is deter-
    mined by the individual configuration option for each IOB. 
    Pull-up and Pull-down Network
    Programmable pull-up and pull-down resistors are used for
    tying unused pins to V
    CC
     or Ground to minimize power con-
    sumption and reduce noise sensitivity. The configurable
    pull-up resistor is a p-channel transistor that pulls to V
    CC
    .
    The configurable pull-down resistor is an n-channel transis-
    tor that pulls to Ground. The value of these resistors is typ-
    ically 20 k
     
     100 k
     
    (
    See 
    “
    Spartan DC Characteristics
    Over Operating Conditions
    ”
     on page 36.
    ). This high value
    makes them unsuitable as wired-AND pull-up resistors.
    OAND2
    F
    X6598
    D0
    S0
    D1
    O
    OMUX2
    X6599
    Figure 7:   AND & MUX Symbols in Spartan-XL IOB 
    Table 7: Supported Destinations for Spartan/XL 
    Outputs
    Destination
    Spartan-XL 
    Outputs
    3.3V,
    CMOS
    √
    Spartan
    Outputs
    5V,
    TTL
    √
    5V, 
    CMOS
    Some
    1
    Any device, V
    CC
     = 3.3V, 
    CMOS-threshold inputs
    Any device, V
    CC
     = 5V, 
    TTL-threshold inputs 
    Any device, V
    CC
     = 5V, 
    CMOS-threshold inputs
    1.
     Only if destination device has 5V tolerant inputs
    √
    √
    √
    Unreliable 
    Data
    √
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    相關(guān)PDF資料
    		

    PDF描述
    		

    
    

    
XCS05-3PC84
Spartan and Spartan-XL Families Field Programmable Gate Arrays

    

    
XCS05
Spartan and Spartan-XL Families Field Programmable Gate Arrays

    

    
XCS05-3BG240C
Spartan and Spartan-XL Families Field Programmable Gate Arrays

    

    
XCS05-3BG240I
Spartan and Spartan-XL Families Field Programmable Gate Arrays

    

    
XCS05-3PQ100I
Spartan and Spartan-XL Families Field Programmable Gate Arrays

    

    

    

    


    


    

    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
XCS05XL-5PC84I
 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays

    

    
XCS05XL-5PQ100C
 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays

    

    
XCS05XL-5PQ100I
 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays

    

    
XCS05XL-5PQ144C
 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays

    

    
XCS05XL-5PQ144I
 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays

    

    
    
    
    
	
    	
    
    
     
     
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