| Rev |
Log message |
Author |
Age |
Path |
| 41 |
Well, finally got ports to work properly without latches. Had to reimplement a specific more complex form of RAM basically. The code is horrid, but testcases pass |
earlz |
4375d 05h |
/tinycpu/trunk/ |
| 40 |
Design doesn't pass synthesis right now. Not for sure why.
Fixed bug with encoding of second opcode byte in assembler
Added testcase for toggle program |
earlz |
4377d 05h |
/tinycpu/trunk/ |
| 39 |
A lot of work in the assembler. It now supports nearly every opcode implemented and is a lot cleaner
Added a bootrom. There isn't really a point in testbenching this.. I'm not for sure how I would, and it will change so much in these early days that it'll be pointless I think
Everything should be ready to go for a test on actual hardware now! |
earlz |
4378d 04h |
/tinycpu/trunk/ |
| 38 |
Made it synthesize without latches |
earlz |
4378d 06h |
/tinycpu/trunk/ |
| 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 |
4380d 04h |
/tinycpu/trunk/ |
| 36 |
Assembler actually has a real opcode now |
earlz |
4380d 06h |
/tinycpu/trunk/ |
| 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 |
4380d 14h |
/tinycpu/trunk/ |
| 34 |
Implemented load and store instructions (`mov reg, [reg]` and `mov [reg], reg` respectively) |
earlz |
4381d 05h |
/tinycpu/trunk/ |
| 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 |
4381d 09h |
/tinycpu/trunk/ |
| 32 |
Finished up changes needed to make memory reading actually work.
Push and Pop now work |
earlz |
4381d 10h |
/tinycpu/trunk/ |
| 31 |
Removed the infamous TRData latch from ALU. Now synthesizes (sorta) warning free. No latches are used. |
earlz |
4382d 05h |
/tinycpu/trunk/ |
| 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 |
4382d 06h |
/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 |
4385d 12h |
/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 |
4386d 07h |
/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 |
4386d 13h |
/tinycpu/trunk/ |
| 26 |
Added extra check to make sure fetcher works properly after memory write |
earlz |
4386d 14h |
/tinycpu/trunk/ |
| 25 |
Wait for memory state now works as expected, and opcode `mov [reg], immd` works now |
earlz |
4386d 18h |
/tinycpu/trunk/ |
| 24 |
Good news, mov to IP actually works as expected! |
earlz |
4387d 12h |
/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 |
4387d 12h |
/tinycpu/trunk/ |
| 22 |
Added to process sensitivity list to avoid warning and added ELSE for IR so it doesn't generate a latch |
earlz |
4388d 04h |
/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 |
4388d 04h |
/tinycpu/trunk/ |
| 20 |
fuck it. All sorts of broken, will try to fix it tomorrow |
earlz |
4389d 04h |
/tinycpu/trunk/ |
| 19 |
Got beginning of core/decoder for the CPU |
earlz |
4389d 05h |
/tinycpu/trunk/ |
| 18 |
Finished memory controller |
earlz |
4392d 15h |
/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 |
4393d 05h |
/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 |
4396d 07h |
/tinycpu/trunk/ |
| 15 |
Added README, LICENSE, and the (so far not created) incdec component |
earlz |
4398d 04h |
/tinycpu/trunk/ |
| 14 |
Added ALU with all the operations we'll need. Synthesizes as well trivially |
earlz |
4398d 12h |
/tinycpu/trunk/ |
| 13 |
Forgot about the new library I added |
earlz |
4398d 15h |
/tinycpu/trunk/ |
| 12 |
registerfile has ports for every register now
makefile now uses GHW file format for gtkwave instead of VCD |
earlz |
4398d 16h |
/tinycpu/trunk/ |
