Programmable input/output circuit for fpga for use in ttl,...

Details Programmable input/output circuit for fpga for use in ttl,... Programmable input/output circuit for fpga for use in ttl,...

H - Electricity

03

K

H03K 19/0175 (2006.01) H03K 19/00 (2006.01) H03K 19/173 (2006.01) H03K 19/177 (2006.01)

Patent

CA 2255107

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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