參數資料
      型號: EPF10K100EBI356-2DX
      英文描述: ASIC
      中文描述: 專用集成電路
      文件頁數: 40/120頁
      文件大?。?/td> 1901K
      代理商: EPF10K100EBI356-2DX
      26
      Altera Corporation
      FLEX 10KE Embedded Programmable Logic Family Data Sheet
      Asynchronous Clear
      The flipflop can be cleared by either LABCTRL1 or LABCTRL2. In this mode,
      the preset signal is tied to VCC to deactivate it.
      Asynchronous Preset
      An asynchronous preset is implemented as an asynchronous load, or with
      an asynchronous clear. If DATA3 is tied to VCC, asserting LABCTRL1
      asynchronously loads a one into the register. Alternatively, the
      MAX+PLUS II software can provide preset control by using the clear and
      inverting the input and output of the register. Inversion control is
      available for the inputs to both LEs and IOEs. Therefore, if a register is
      preset by only one of the two LABCTRL signals, the DATA3 input is not
      needed and can be used for one of the LE operating modes.
      Asynchronous Preset & Clear
      When implementing asynchronous clear and preset, LABCTRL1 controls
      the preset and LABCTRL2 controls the clear. DATA3 is tied to VCC, so that
      asserting LABCTRL1 asynchronously loads a one into the register,
      effectively presetting the register. Asserting LABCTRL2 clears the register.
      Asynchronous Load with Clear
      When implementing an asynchronous load in conjunction with the clear,
      LABCTRL1
      implements the asynchronous load of DATA3 by controlling the
      register preset and clear. LABCTRL2 implements the clear by controlling
      the register clear; LABCTRL2 does not have to feed the preset circuits.
      Asynchronous Load with Preset
      When implementing an asynchronous load in conjunction with preset, the
      MAX+PLUS II software provides preset control by using the clear and
      inverting the input and output of the register. Asserting LABCTRL2 presets
      the register, while asserting LABCTRL1 loads the register. The
      MAX+PLUS II software inverts the signal that drives DATA3 to account for
      the inversion of the register’s output.
      Asynchronous Load without Preset or Clear
      When implementing an asynchronous load without preset or clear,
      LABCTRL1
      implements the asynchronous load of DATA3 by controlling the
      register preset and clear.
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