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    • 參數(shù)資料
      型號: ZPSD512B1-12LI
      英文描述: Field-Programmable Peripheral
      中文描述: 現(xiàn)場可編程外圍
      文件頁數(shù): 23/153頁
      文件大?。?/td> 1036K
      代理商: ZPSD512B1-12LI
      PSD5XX Famly
      20
      9.1.2.2 Port B Macrocell Structure
      Figure 8 shows the PB Macrocell block, which consists of 8 identical macrocells. Each
      macrocell output can be connected to its own I/O pin on Port B. The two inputs, CLKIN and
      MACRO-RST, are used as clock and clear inputs to all the macrocells. The CLKIN comes
      directly from the CLKIN input pin. The MACRO-RST is the same as the Reset input pin
      except it is user configurable.
      The circuit of a PB Macrocell is shown in Figure 9. There are 10 product terms from the
      GPLD’s AND ARRAY as inputs to the macrocell. Users can select the polarity of the output,
      and configure the macrocell to operate as:
      J
      Registered Output
      Select output from D flip flop.
      J
      Combinatorial Output
      Select output from OR gate.
      J
      GPLD Input
      Use Port B pin as dedicated input.
      J
      GPLD Output
      Use Port B pin as dedicated output.
      J
      GPLD I/O
      Use Port B pin as bidirectional pin.
      J
      Macrocell Feedback
      Register feedback for state machine implementations or expander feedback
      from the combinatorial output, to possibly expand the number of product terms
      available to another macrocell.
      In case of "Buried Feedback", where the output of the macrocell is not
      connected to a Port B pin, Port B can be configured to perform other user
      defined I/O functions.
      Each D flip flop in the macrocells has its own dedicated asynchronous clear, preset and
      clock input. The signals are defined as follow:
      J
      PRESET
      Active only if defined by a product term (PBx.PR)
      J
      CLEAR
      Two selectable inputs: Reset input or user defined product term (PBx.RE)
      J
      CLK
      Two selectable inputs – CLKIN input or user defined product term (PBx.CLK).
      The macrocell is operated in Synchronous Mode if the clock input is CLKIN, and is in
      Asynchronous Mode if the clock is a product-term clock defined by the user.
      The PSD5XX
      Architecture
      (cont.)
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