Problem $5$: $(10$ points$)$ Specify the register transfer operations in RTL for the following $32-$bit digital system operations $($your answers should be using RTL not microcode$)$:

a$.$ Sub the contents of registers $8$ from $11$ and place the result in register $10.$

b$.$ Set $($which means set to $1)$ the upper byte of register $15--($bits $31$ to $24$ should be $1$s and the rest of register $15$ bits will remain unaltered$).$