MIPS Pipelining Help: Filling the Timeline w/ & w/o Forwarding

[jdoe10]

Homework Statement

Assembly Code:
LW R1, 0(R2)
add R4, R3, R1
add R3, R1, R4
What are the dependencies
Fill the pipelining timeline if:
a. There is forwarding
b. There is no forwarding

Homework Equations

N/A

The Attempt at a Solution

With forwarding attempt:

Without forwarding attempt:

Am I filling the pipelining timeline correctly?

 

[Mark44]

Homework Statement

Assembly Code:
LW R1, 0(R2)
add R4, R3, R1
add R3, R1, R4
What are the dependencies
Fill the pipelining timeline if:
a. There is forwarding
b. There is no forwarding

Homework Equations

N/A

The Attempt at a Solution

With forwarding attempt:

Without forwarding attempt:

Am I filling the pipelining timeline correctly?

Are you working from a textbook? There are only two that I am aware of: "MIPS Assembly language Programming," by Robert Britton, and "Computer Organization and Design: The Hardware/Software Interface," by Patterson and Hennessey. Chapter 10 in the Britton book, which I have, discusses pipelined implementations. I don't have the other book, so can't comment on it.
As far as your question, I'm in the process of learning MIPS programming, but I'm not up to speed on the forwarding business just yet.