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本帖最后由 超級狗 于 2013-8-14 15:53 编辑 - A2 p# g8 E$ I" Q3 g% I+ E
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Device Output-Enable Pin7 k# H0 M6 ^+ q/ ?0 w
The MAX II device has a chip-wide output-enable pin (DEV_OE) to control the output enable for all output pins in your design. This allows bus-sharing in your system where you can disable the MAX II output so that other devices can drive the bus. If you use this option, all outputs on the chip operate normally when DEV_OE is asserted. When the pin is deasserted, all outputs are tri-stated. The DEV_OE pin functions as a normal user I/O pin if the option is not used.
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发表于 2013-8-14 12:15
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发表于 2013-8-14 15:12
