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Home > FPGA Technical Tutorials > Design Recipes for FPGAs Using Verilog and VHDL > PS/2 Mouse Interface > PS/2 Mouse with Wheel

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PS/2 Mouse with Wheel

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A mouse that has a wheel is defined as a separate type of device and so it has a different device id 0x03. In this case, after reset, the mouse sends the ID and in the case of a wheel mouse, the data packet is now 4 bytes long and there is an extra byte to provide the wheel movement. This byte only uses the least significant bits in a 2s-complement form and therefore has a range of −8 to +7. 

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