Woah it’s 36% of my grade
You SHOULD bring a highlighter
You will get an aid sheet
If something was stressed, itll be there Designing based on a story, assume things and design the circuit that solves the story “what is SRAM, what is DRAM, what is ~~“
Review slides are good. But also skim the full slides. But also don’t just go “yeah, i get it” lol
- He doesn’t like to write hard exams. He just wants to make sure you remember the things you can actually apply in the future. It’s a K map you can solve, and demonstrates your understanding of it, for instance.
"The datapath and control stuff might be tricky" (as he said)
Types of questions
- SA’s (1 word answers)
- MC (they seem really easy)
- T/F
Gate Cost (# of ) Gate Cost & Inverter (assuming A bar or B bar isn’t supplied, we add a cost for each inverter)
- For the TWO C bars, we dont need to add two cost; we can optimize!
- Just have C inverted, drive that into the two C bar inputs
- The final answer should be G(Y) = 9 and GN(Y) = 12
- Slides should be updated with correct answer (used to be 9 and 14)
For question 12, its truetodo Gotta review!
Drawing transistor circuits aaaaaa
- We have 3 lines
- Vcc
- Output
- Ground
- We start with pull-down or pull-up network
- For pull-down, we consider when the output is 0 (easy for NAND! That’s when all inputs are all 1)
- NMOS and PMOS
- 3 nmos in series = when A B C are all 1’s, we have true
- For pull-up network, we invert below
- 3 transistors in series ⇒ 3 transistors in parallel
- NMOS ⇒ PMOS
- The triangle at the top (the “arrow”) means Vcc / Logic-1
Knowing the boolean expressions of things like Muxes are useful for questions (slide 19)
Second half
Sequential circuits!
todo We have to include the propagation delay 😨
- We assume we include it, unless explicitly told otherwise
todo diff between write data and write reg? Oh nvm im slow
”Integer value stored in memory at address $s0” = “RAM memory, not instruction or registers!” Why didn’t we use sll? We only do that when we deal with PC
- cuz we know all addresses we mult by 4. But in memory (RAM), it might not be word aligned (i.e. you could be loading a byte for instance!)
- todo important detail there
todo Also gotta review the last lecture (ALUSrcB and its two bits, for instance)
twos complement question
Invert all bits, then add 1. That’s how you do it!
Oh smart, you can do subtraction
sub $a1, $zero, $a0
Know all the pseudo-instructions