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APEX20KC 数据表(PDF) 39 Page - Altera Corporation |
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APEX20KC 数据表(HTML) 39 Page - Altera Corporation |
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39 / 90 page  Altera Corporation 39 APEX 20KC Programmable Logic Device Data Sheet The register in the APEX 20KC IOE can be programmed to power-up high or low after configuration is complete. If it is programmed to power-up low, an asynchronous clear can control the register. If it is programmed to power-up high, an asynchronous preset can control the register. This feature is useful for cases where the APEX 20KC device controls an active- low input or another device; it prevents inadvertent activation of the input upon power-up. Figure 25 shows how fast bidirectional I/O pins are implemented in APEX 20KC devices. This feature is useful for cases where the APEX 20KC device controls an active-low input or another device; it prevents inadvertent activation of the input upon power-up. |
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