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EPF10K100 数据表(PDF) 29 Page - Altera Corporation |
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EPF10K100 数据表(HTML) 29 Page - Altera Corporation |
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29 / 128 page  Altera Corporation 29 FLEX 10K Embedded Programmable Logic Device Family Data Sheet I/O Element An I/O element (IOE) contains a bidirectional I/O buffer and a register that can be used either as an input register for external data that requires a fast setup time, or as an output register for data that requires fast clock- to-output performance. In some cases, using an LE register for an input register will result in a faster setup time than using an IOE register. IOEs can be used as input, output, or bidirectional pins. For bidirectional registered I/O implementation, the output register should be in the IOE and, the data input and output enable register should be LE registers placed adjacent to the bidirectional pin. The Compiler uses the programmable inversion option to invert signals from the row and column interconnect automatically where appropriate. Figure 13 shows the bidirectional I/O registers. |
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