RM Assemble Language On Xilinx Vitis Sample

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Use three 8-bit PWM circuits to control the color of one of the on-board RGB’s. Set the Red LED brightness using the voltage generated by the on-board potentiometer (by reading a value from the ADC); set the Green LED using a value read from eight slide switches; and set the Blue LED using an 8-bit value sent via UART (your program should send a prompt to the terminal, and then wait for you to type and send a value). For all LEDs, the 8-bit value should set the duty cycle directly, with 0x00 being fully off and 0xFF being fully on. 

Oral answer: The provided PWM circuit uses a 100MHz clock to drive the period and duty cycle counters. If the 8 LSB’s are used to define duty cycle, pulse widths from 10ns to 2550ns can be defined. These pulse widths may be too short to fully turn on the LED, resulting in poor brightness control (especially on the low end). Keeping in mind you can’t change the 100Mhz source clock, briefly discuss how you can configure the PWM system to generate pulse widths that range from 2.55us to about 653us. Be specific.