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Found 2 results

  1. Hi Digilent staff, and fellow forum members, Just wondering if you guys had considered making a USB HID -> PS/2 PMOD board? I was thinking of something like the circuit on the Nexys 3,4 boards which uses a PIC to convert a USB keyboard to PS/2 compatible signals. Would be handy for using newer USB keyboards/mice on PMOD socket equipped FPGA boards. PS/2 devices are becoming harder to find brand new. I (for one) would be interested in a few. Kind regards, Leslie
  2. Hi! I'm working with porting an FPGA design with a soft core CPU to the Nexys A7 100T board. The CPU's SW is polling a PS/2 keyboard each 16ms by releasing the PS2_CLK (changing the pin 0->Z, i.e. inhibit release) during ~100µs. This works fine on the earlier design that uses a real PS/2 keyboard, but it fails with using the USB -> PS/2 emulation on the Nexys A7 board. A deeper investigation shows that real PS/2 keyboard responses with lowering the PS2_CLK signal 25-35µs after the CPU has change the PS2_CLK pin 0->Z, while the Nexys PS/2 emulation seems to require up to 420µs before it responses. What is the specified max response time after inhibit for the PS/2 emulation implementation? Would it be possible to have a FW update that lowers this time? I also noted that the link to the Release page under "Demo Setup" on points to the wrong URL (I assume that the correct URL should be and the demo shows the keyboard code on the 7-segment display, not via the serial port. Best regards, Per-Olof