$3.[20]$ Assume a particular $4$Gb DDR$4-3600$ chip organized as $512$M x $8$ uses $15-15-15$ timing.

a$.[10]$ Assuming the device is in the pre$-$charged state, how long $($in nanoseconds$)$ will it take to

complete the read of a byte of data? Show your work.

b$.[10]$ Assuming the device is in the pre$-$charged state, how long $($in nanoseconds$)$ will it take to

read a burst of data? Show your work