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    • 參數(shù)資料
      型號: M4A5-64/32-10JI
      廠商: Lattice Semiconductor Corporation
      文件頁數(shù): 9/62頁
      文件大?。?/td> 0K
      描述: IC CPLD 64MACRO 44PLCC
      標準包裝: 52
      系列: ispMACH® 4A
      可編程類型: 系統(tǒng)內(nèi)可編程
      最大延遲時間 tpd(1): 10.0ns
      電壓電源 - 內(nèi)部: 4.5 V ~ 5.5 V
      宏單元數(shù): 64
      輸入/輸出數(shù): 32
      工作溫度: -40°C ~ 85°C
      安裝類型: 表面貼裝
      封裝/外殼: 44-LCC(J 形引線)
      供應商設備封裝: 44-PLCC(16.58x16.58)
      包裝: 管件
      其它名稱: Q6750325
      ispMACH 4A Family
      17
      I/O Cell
      The I/O cell (Figures 10 and 11) simply consists of a programmable output enable, a feedback path, and
      flip-flop (except ispMACH 4A devices with 1:1 macrocell-I/O cell ratio). An individual output enable
      product term is provided for each I/O cell. The feedback signal drives the input switch matrix.
      The I/O cell (Figure 10) contains a flip-flop, which provides the capability for storing the input in a D-type
      register or latch. The clock can be any of the PAL block clocks. Both the direct and registered versions of
      the input are sent to the input switch matrix. This allows for such functions as “time-domain-multiplexed”
      data comparison, where the first data value is stored, and then the second data value is put on the I/O pin
      and compared with the previous stored value.
      Note that the flip-flop used in the ispMACH 4A I/O cell is independent of the flip-flops in the macrocells.
      It powers up to a logic low.
      Zero-Hold-Time Input Register
      The ispMACH 4A devices have a zero-hold-time (ZHT) fuse which controls the time delay associated with
      loading data into all I/O cell registers and latches. When programmed, the ZHT fuse increases the data path
      setup delays to input storage elements, matching equivalent delays in the clock path. When the fuse is erased,
      the setup time to the input storage element is minimized. This feature facilitates doing worst-case designs
      for which data is loaded from sources which have low (or zero) minimum output propagation delays from
      clock edges.
      D/L
      Q
      Block CLK3
      Block CLK2
      Block CLK1
      Block CLK0
      To Input
      Switch
      Matrix
      Individual
      Output Enable
      Product Term
      From Output
      Switch Matrix
      17466G-017
      17466G-018
      Figure 10. I/O Cell for ispMACH 4A Devices with 2:1
      Macrocell-I/O Cell Ratio
      Figure 11. I/O Cell for ispMACH 4A Devices with 1:1
      Macrocell-I/O Cell Ratio
      To Input
      Switch
      Matrix
      Individual
      Output Enable
      Product Term
      From Output
      Switch Matrix
      Power-up reset
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