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    參數(shù)資料
    型號(hào): CY37384VP256-200BAXC
    廠商: Cypress Semiconductor Corp.
    英文描述: 5V, 3.3V, ISRTM High-Performance CPLDs
    中文描述: 為5V,3.3V,ISRTM高性能的CPLD
    文件頁數(shù): 6/64頁
    文件大?。?/td> 1792K
    代理商: CY37384VP256-200BAXC
    Ultra37000 CPLD Family
    Document #: 38-03007 Rev. *D
    Page 6 of 64
    Clockin g
    Each I/O and buried macrocell has access to four synchronous
    clocks (CLK0, CLK1, CLK2 and CLK3) as well as an
    asynchronous product term clock PTCLK. Each input
    macrocell has access to all four synchronous clocks.
    Dedicated Inputs/Clocks
    Five pins on each member of the Ultra37000 family are desig-
    nated as input-only. There are two types of dedicated inputs
    on Ultra37000 devices: input pins and input/clock pins.
    Figure 3
    illustrates the architecture for input pins. Four input
    options are available for the user: combinatorial, registered,
    double-registered, or latched. If a registered or latched option
    is selected, any one of the input clocks can be selected for
    control.
    Figure 4
    illustrates the architecture for the input/clock pins.
    Like the input pins, input/clock pins can be combinatorial,
    registered, double-registered, or latched. In addition, these
    pins feed the clocking structures throughout the device. The
    clock path at the input has user-configurable polarity.
    Product Term Clocking
    In addition to the four synchronous clocks, the Ultra37000
    family also has a product term clock for asynchronous
    clocking. Each logic block has an independent product term
    clock which is available to all 16 macrocells. Each product term
    clock also supports user configurable polarity selection.
    Timing Model
    One of the most important features of the Ultra37000 family is
    the simplicity of its timing. All delays are worst case and
    system performance is unaffected by the features used.
    Figure
    5
    illustrates the true timing model for the 167-MHz devices in
    high speed mode. For combinatorial paths, any input to any
    output incurs a 6.5-ns worst-case delay regardless of the
    amount of logic used. For synchronous systems, the input
    set-up time to the output macrocells for any input is 3.5 ns and
    the clock to output time is also 4.0 ns. These measurements
    are for any output and synchronous clock, regardless of the
    logic used.
    The Ultra37000 features:
    No fanout delays
    No expander delays
    No dedicated vs. I/O pin delays
    No additional delay through PIM
    No penalty for using 0–16 product terms
    No added delay for steering product terms
    No added delay for sharing product terms
    No routing delays
    No output bypass delays
    The simple timing model of the Ultra37000 family eliminates
    unexpected performance penalties.
    Figure 4. Input/Clock Macrocell
    Figure 3. Input Macrocell
    0
    1
    2
    3
    O
    C10C11
    TO PIM
    D
    Q
    D
    Q
    D
    Q
    LE
    INPUT/CLOCK PIN
    0
    1
    2
    3
    O
    FROM CLOCK
    POLARITY INPUT
    CLOCK PINS
    0
    1
    O
    C12
    TO CLOCK MUX ON
    ALL INPUT MACROCELLS
    TO CLOCK MUX
    IN EACH
    0
    1
    CLOCK POLARITY MUX
    ONE PER LOGIC BLOCK
    FOR EACH CLOCK INPUT
    C8 C9
    C13, C14, C15
    OR C16
    O
    0
    1
    2
    3
    O
    C12 C13
    TO PIM
    D
    Q
    D
    Q
    D
    Q
    LE
    INPUT PIN
    0
    1
    2
    3
    O
    C10
    FROM CLOCK
    POLARITY MUXES
    C11
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