Very-large-scale integration (VLSI) Interview Question:

Explain the difference between write through and write back cache?

Submitted by: Administrator

Write Through. After writing in cache memory, main memory is
updated too inmediatly to mantain reliability

Write Back After writing in cache memory a flag bit called
dirty bit is set. When this value need to be replaced that
bit is check, if it is set then the value is taken to main
memory
Submitted by: Administrator