L1 A.T = 20ns
M/M A.T = 40ns
L1 Write Time = 40ns
M/M Write Time = 50ns
Write Through Technique: on each write request by CPU, memory will be updated everytime.
In Write Through we use "No Write Allocate" techniqiue, it means if there is a write miss in cache we directly write memory instead of bringing a block first into cache and then write it.
Avg Write Time = .65*max(40,50)ns + .35*50 = 50ns