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Programmable input/output circuit for FPGA for use in TTL, GTL, GTLP, LVPECL and LVDS circuits
Programmable input/output circuit for FPGA for use in TTL, GTL, GTLP, LVPECL and LVDS circuits
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机译:FPGA的可编程输入/输出电路,用于TTL,GTL,GTLP,LVPECL和LVDS电路
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摘要
A programmable input/output structure comprised of three input circuits and one output circuit coupled to the pin of an FPGA with the input circuits and output circuits being selectively enabled by programming bits so that input signals may be accepted from TTL, GTL, GTLP, LVPECL or LVDS type external circuits. The programming bits can also selectively enable an output driver to simultaneously drive the same pin of the FPGA as an output with signals which are either TTL or GTL or GTLP compatible. Further, the slew rate of the output driver is programmable between slow, medium or fast.
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