Question

Control signal regwrite must be 0 when memtoreg is 0 because wd3 can (in this cycle) otherwise get the wrong value. (True/False)

Answer 1

The statement is true. When memtoreg is 0, regwrite should be 0 to avoid writing the wrong value.

Step-by-step explanation:

The statement is True. The regwrite control signal determines whether data from the write data register, wd3, should be written back to the register file. When memtoreg is 0 (indicating that the result of the current operation is not being written back from memory), it is necessary to set regwrite to 0 as well to avoid writing the wrong value to the register file. This is because the value in wd3 could be from a previous memory read operation and may not be the correct value to be written back.