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Hi all, I am trying to interface a ps2 keyboard to the Xilinx Spartan2 FPGA I have. I have connected the keyboard to the Digilab DIO1 board and see no activity on the PS2D and PS2C pins when I use a logic analyser, and even when I pick inputs from the relevent FPGA pins and try to drive LEDs with those inputs. Anyone tried this? Comments will be deeply appreciated. Thanks Animesh |
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Help on interfacing PS2 keyboard on spartan2.
Started by ●April 9, 2004
Reply by ●April 10, 20042004-04-10
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Animesh: Who's PS/2 keyboard code are you using ? I'm not familiar with the Digilab DIO1. What size Spartan 2 is it ? I converted the open cores PS/2 keyboard code from verilog to VHDL and implemented it on my System09 using a XC2S300e. I changed the time constants for the 49.125 MHz clock to those required for a 12.5MHz, which is the clock speed of my CPU. The open cores code needs a wrapper to interface to the microcomputer bus to provide a bi-directional data register and a command / status register. The original code has provisions for a scan code output as well as the ASCII code equivalent. I only implemented the ASCII code interface. It seemed to work fine. Using a micro in the FPGA gives you a way to examine registers to see what the keyboard is receiving. You might like to use the XR16, but I have not used it yet so I'm not sure what is involved. http://members.optushome.com.au/jekent/system09/index.html John. Animesh Pathak wrote: >Hi all, >I am trying to interface a ps2 keyboard to the Xilinx Spartan2 FPGA I >have. >I have connected the keyboard to the Digilab DIO1 board and see no >activity on the PS2D and PS2C pins when I use a logic analyser, and >even when I pick inputs from the relevent FPGA pins and try to drive >LEDs with those inputs. >Anyone tried this? >Comments will be deeply appreciated. >Thanks >Animesh > -- http://members.optushome.com.au/jekent |
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Reply by ●April 14, 20042004-04-14
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Hi John, Thanks for the pointers. I am not 'coding' this. I am using ePD, the innoveda tool. The Hardware is Spartan2. Xc2s30. TQ144 If anyone has used this, please let me know. Thanks Animesh --- In , John Kent <jekent@o...> wrote: > Animesh: > > Who's PS/2 keyboard code are you using ? > I'm not familiar with the Digilab DIO1. What size Spartan 2 is it ? > > I converted the open cores PS/2 keyboard code from verilog to VHDL > and implemented it on my System09 using a XC2S300e. > > I changed the time constants for the 49.125 MHz clock to those > required for a 12.5MHz, which is the clock speed of my CPU. > > The open cores code needs a wrapper to interface to the microcomputer > bus to provide a bi-directional data register and a command / status > register. > The original code has provisions for a scan code output as well as the > ASCII code equivalent. I only implemented the ASCII code interface. > > It seemed to work fine. > > Using a micro in the FPGA gives you a way to examine registers to > see what the keyboard is receiving. You might like to use the XR16, > but I have not used it yet so I'm not sure what is involved. > > http://members.optushome.com.au/jekent/system09/index.html > > John. > .com.au/jekent |
