| Rev |
Log message |
Author |
Age |
Path |
| 38 |
Made it synthesize without latches |
earlz |
4429d 11h |
/tinycpu |
| 37 |
Worked on the assembler more
Added a memory mapped port to memory.vhd. This change causes a lot of latches to be inferred in synthesis however, so this will have to change some |
earlz |
4431d 09h |
/tinycpu |
| 36 |
Assembler actually has a real opcode now |
earlz |
4431d 11h |
/tinycpu |
| 35 |
Added a little assembler ruby script. Basically, I plan on levaraging the power of Ruby as a DSL to very easily create an assembler, rather than having to parse everything myself. |
earlz |
4431d 19h |
/tinycpu |
| 34 |
Implemented load and store instructions (`mov reg, [reg]` and `mov [reg], reg` respectively) |
earlz |
4432d 10h |
/tinycpu |
| 33 |
Added more test cases for push/pop. More are still needed though
Fixed SP increment/decrementing
Added new opcode `mov reg,reg` so debugging isn't such a pain |
earlz |
4432d 13h |
/tinycpu |
| 32 |
Finished up changes needed to make memory reading actually work.
Push and Pop now work |
earlz |
4432d 15h |
/tinycpu |
| 31 |
Removed the infamous TRData latch from ALU. Now synthesizes (sorta) warning free. No latches are used. |
earlz |
4433d 10h |
/tinycpu |
| 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 |
4433d 11h |
/tinycpu |
| 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 |
4436d 17h |
/tinycpu |
| 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 |
4437d 12h |
/tinycpu |
| 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 |
4437d 18h |
/tinycpu |
| 26 |
Added extra check to make sure fetcher works properly after memory write |
earlz |
4437d 19h |
/tinycpu |
| 25 |
Wait for memory state now works as expected, and opcode `mov [reg], immd` works now |
earlz |
4437d 23h |
/tinycpu |
| 24 |
Good news, mov to IP actually works as expected! |
earlz |
4438d 17h |
/tinycpu |
| 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 |
4438d 17h |
/tinycpu |
| 22 |
Added to process sensitivity list to avoid warning and added ELSE for IR so it doesn't generate a latch |
earlz |
4439d 09h |
/tinycpu |
| 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 |
4439d 09h |
/tinycpu |
| 20 |
fuck it. All sorts of broken, will try to fix it tomorrow |
earlz |
4440d 09h |
/tinycpu |
| 19 |
Got beginning of core/decoder for the CPU |
earlz |
4440d 10h |
/tinycpu |
| 18 |
Finished memory controller |
earlz |
4443d 20h |
/tinycpu |
| 17 |
Added fetch component for fetching from memory to instruction register
Added additional testing for carryover to make sure it's correct |
earlz |
4444d 09h |
/tinycpu |
| 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 |
4447d 12h |
/tinycpu |
| 15 |
Added README, LICENSE, and the (so far not created) incdec component |
earlz |
4449d 09h |
/tinycpu |
| 14 |
Added ALU with all the operations we'll need. Synthesizes as well trivially |
earlz |
4449d 17h |
/tinycpu |
| 13 |
Forgot about the new library I added |
earlz |
4449d 20h |
/tinycpu |
| 12 |
registerfile has ports for every register now
makefile now uses GHW file format for gtkwave instead of VCD |
earlz |
4449d 21h |
/tinycpu |
| 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 |
4453d 10h |
/tinycpu |
| 10 |
Just committing so I can keep this original that passes simulation, but still synthesizes to LUTs |
earlz |
4453d 10h |
/tinycpu |
| 9 |
Trying to add a byte-enable to the RAM. Used Xilinx's template for it, but ghdl won't pass the testbench |
earlz |
4453d 18h |
/tinycpu |
