$$Register read$$ is the time needed after the rising clock edge for the new register value to appear on the output. This value applies to the PC only. $$Shift left $2$ takes $2$ single gates$$ time.

$($a$)$ What is the latency of an R$-$type instruction $($i$.$e$.,$ how long must the clock period be to ensure that this instruction works correctly$)?$

$($b$)$ What is the latency of LDUR? $($Check your answer carefully. Many students place extra muxes on the critical path.$)$

$($c$)$ What is the latency of STUR? $($Check your answer carefully. Many students place extra muxes on the critical path.$)$

$($d$)$ What is the latency of B$?$

$($e$)$What is the minimum clock period for this CPU?