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n3rdx

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  1. n3rdx

    Type 6 Expanded?

    Wishful thinking: just curious if the PMOD standards team can consider for 2021 the possibility of using high density pin connectors (there are umpteen options, pick one) if many GPIO (who doesn't need more than a few) I/O is desired, or mixed signal (analog/digital/differential) interfaces are desired. Perhaps a 20~30 pin multiple-row connector (or finer pitch connector) could be considered which would allow independent VARs to produce adapter cables (e.g., high density PMOD to standard PMOD) adapter cables for sale. .... It would save board space! But if that option can be discussed (please), then i would also ask why not float the concept of a FMC-very-light adapter standard where an I2C (or IIC) (or whatever-bus) chip with I/O banks could be supported as PMOD I/O fanout - save pins on the FPGA (good) and fan them out at the connector (excellent) and allow different operating voltages, or direct connections to opto-couplers. Yes, this could be a different product series - perhaps very useful for the industrial/academic applications of Digilent products. I ran across recently products from a vendor Diodes, Inc., with a fairly low cost IO expanders - one of them allows 64 I/O on a two-wire dedicated bus (I2C/SMbus) at speed of upto 400 kHz.. What I am suggesting is that the PMOD adapter connector be utilized as multiple I2C bus (say, on a 6x2 conn. you would get about 5 such bus plus VCC, GND), each supporting 64 I/O in a mux/demux arrangement) interface to a captive I/O bus expander. Slight need for a software mux/demux but almost any code to read/write 16/32 bits at a time could be used.
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