Quiz submission record for quiz6-2-2 at Thu Jul 29 10:24:54 2004:

Your Answer for Question 1:
EPC is a register used to hold affected instructions in expections.
The cause register is used to record the casue of the exception.

The mfco command is used


Your Answer for Question 2:
Imprecise exceptions are exceptions that are imprecise association of exceptions with the correct instruction in pipelined computers.

Your Answer for Question 3:
A drawback of polling is the fact that processors are a lot faster than I/I devices and as such much time is wasted when the process to read a register many times to find a device has not yet completed an I/O operation.

Your Answer for Question 4:
Memory mapped IO mean that a portion of the address space is assigned to I/O device.

assume receiver control at $a0 and receiver data at $a1.

Loop:
andi $t0,a1,0x00000001
beq $t0, $0, end
lbu $v0,0(a1)
j Loop

End: 


Your unique submission ID is quiz6-2-2-cs61c-ba-1091121894-2168.