| Rev |
Log message |
Author |
Age |
Path |
| 30 |
After a long weekend of thinking how to do this.. I've decided instead to not strive for a single-cycle computer.
Now, instead, ALU operations will be 2 cycle along with memory operations, and data movement operations are still 1 cycle |
earlz |
4401d 09h |
/tinycpu/trunk/ |
| 29 |
Well, added a testcase for testing the ALU bitwise operations and found a very large problem.
I'm pretty sure that the decoder needs to be partially unclocked because it essentially makes the ALU clocked how it is now, which is very bad. |
earlz |
4404d 16h |
/tinycpu/trunk/ |
| 28 |
Ok now registerfile is correct. Only using rising_edge. Now DataOut is the same as DataIn when WriteEnable is asserted.
Some of my tests had to be changed because I was expecting the DataOut to be updated 1 clock cycle after the instruction rather than on the same clock cycle.
Now it's truly single-cycle and without all the weird regIn stuff on the carryovers |
earlz |
4405d 11h |
/tinycpu/trunk/ |
| 27 |
Added a few ALU opcodes and came across a weird propogation delay issue with my registerfile.
As a workaround, I'm trying to use falling_edge instead of rising_edge. We shall see if I regret this later |
earlz |
4405d 17h |
/tinycpu/trunk/ |
| 26 |
Added extra check to make sure fetcher works properly after memory write |
earlz |
4405d 18h |
/tinycpu/trunk/ |
| 25 |
Wait for memory state now works as expected, and opcode `mov [reg], immd` works now |
earlz |
4405d 22h |
/tinycpu/trunk/ |
| 24 |
Good news, mov to IP actually works as expected! |
earlz |
4406d 15h |
/tinycpu/trunk/ |
| 23 |
Added top module for testing how our memory and cpu will work together. (hint: success)
Messing around with a small timing issue in core |
earlz |
4406d 16h |
/tinycpu/trunk/ |
| 22 |
Added to process sensitivity list to avoid warning and added ELSE for IR so it doesn't generate a latch |
earlz |
4407d 08h |
/tinycpu/trunk/ |
| 21 |
The core_tb testbench finally passes. It probably doesn't synthesize, or even pass other testbenches, but it passes that one damn it. |
earlz |
4407d 08h |
/tinycpu/trunk/ |
| 20 |
fuck it. All sorts of broken, will try to fix it tomorrow |
earlz |
4408d 08h |
/tinycpu/trunk/ |
| 19 |
Got beginning of core/decoder for the CPU |
earlz |
4408d 09h |
/tinycpu/trunk/ |
| 18 |
Finished memory controller |
earlz |
4411d 19h |
/tinycpu/trunk/ |
| 17 |
Added fetch component for fetching from memory to instruction register
Added additional testing for carryover to make sure it's correct |
earlz |
4412d 08h |
/tinycpu/trunk/ |
| 16 |
Renamed incdec to carryover (see design for why).
carryover should be done, though may change the "straight through on disable" behavior to instead leaving it floating depending on how things go later with coding. |
earlz |
4415d 11h |
/tinycpu/trunk/ |
| 15 |
Added README, LICENSE, and the (so far not created) incdec component |
earlz |
4417d 08h |
/tinycpu/trunk/ |
| 14 |
Added ALU with all the operations we'll need. Synthesizes as well trivially |
earlz |
4417d 16h |
/tinycpu/trunk/ |
| 13 |
Forgot about the new library I added |
earlz |
4417d 19h |
/tinycpu/trunk/ |
| 12 |
registerfile has ports for every register now
makefile now uses GHW file format for gtkwave instead of VCD |
earlz |
4417d 20h |
/tinycpu/trunk/ |
| 11 |
Finally, it synthesizes to BRAM.. Possibly need to fix how the DataOut syncs with WriteEnable and Address though if I plan to both read and write on the same clock edge |
earlz |
4421d 09h |
/tinycpu/trunk/ |
