Tagged Questions
3
votes
1answer
117 views
Is there such a thing as a circuit that outputs 1 if the input is high-impedance, and 0 otherwise?
I am trying to design a circuit that outputs a logical 1 if the input is high-impedance, and a 0 otherwise.
Any idea how I might implement this? I would prefer to use off-the-shelf parts (no ...
1
vote
2answers
280 views
Properly simulating a NAND gate? (I'm building a computer in my computer)
I am about to embark on a project, enspired by Nand2Tetris (http://www.nand2tetris.org/), to fully simulate a computer, building the entire thing up from NAND gates.
I want to simulate everything ...
0
votes
2answers
120 views
Verilog modules: estimating power consumption before physical design
What can a designer do to get an idea of how much power a various module with consume? It seems like there should exist some decent heuristics to go about doing this, else we would have to wait until ...
4
votes
1answer
163 views
Processor design: turning blocks on/off dynamically to save power?
I was wondering if this is possible and if it is done in current designs. Seemed like an interesting enough idea to me. Here's a little diagram I made to help try and explain:
So let's say I'm ...
0
votes
1answer
266 views
graphical circuit simulator like logisim
I wanted to make a CPU and then somehow measure its efficiency/ speed. Logisim is a little buggy, and I don't think it allows you to do any sort of testing/ measurement. Does a tool like this exist?
5
votes
1answer
206 views
One-clock increment operation in a three-bus CPU architecture
In his chapter on CPU design, Edward Bosworth introduces the following three-bus architecture:
One of the main design aims of this circuit is to be able to increment the program counter PC in a ...
0
votes
1answer
131 views
single-cycle design using and shared memory for both data and instruction
This is not really a question on electronics , it's more a question on logical design.
I hope this is the right place to ask.
How come it is not possible two use a single-cycle design
and have a ...
1
vote
3answers
540 views
SRAM memory cell - what kind of flip-flop
There is a classic 6T SRAM cell (image from wikipedia):
It looks like (two inverters in opposite directions and interconnected in and out) and works like some flip-flop.
But what kind of flipflop ...
3
votes
2answers
285 views
How many transistors is a transistor connected to in a CPU?
On average, how many transistors is a transistor connected to in a CPU?
What is the average fan-out of a gate in a CPU?
What is the average fan-in of a gate in a CPU?
(I'm guessing these numbers ...
6
votes
3answers
446 views
Is there a name for “chips out of which one can build a CPU”?
Some people enjoy building "homebrew" CPUs out of simpler ICs.
Is there a name for "chips out of which one can build a CPU, if you have enough of them"?
Is there a name for the other chips, "chips ...
