| 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 |
4355d 02h |
/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 |
4357d 02h |
/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 |
4358d 01h |
/tinycpu/trunk/ |
| 38 |
Made it synthesize without latches |
earlz |
4358d 03h |
/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 |
4360d 01h |
/tinycpu/trunk/ |
| 36 |
Assembler actually has a real opcode now |
earlz |
4360d 03h |
/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 |
4360d 12h |
/tinycpu/trunk/ |
| 34 |
Implemented load and store instructions (`mov reg, [reg]` and `mov [reg], reg` respectively) |
earlz |
4361d 02h |
/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 |
4361d 06h |
/tinycpu/trunk/ |
| 32 |
Finished up changes needed to make memory reading actually work.
Push and Pop now work |
earlz |
4361d 07h |
/tinycpu/trunk/ |
| 31 |
Removed the infamous TRData latch from ALU. Now synthesizes (sorta) warning free. No latches are used. |
earlz |
4362d 02h |
/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 |
4362d 03h |
/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 |
4365d 09h |
/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 |
4366d 04h |
/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 |
4366d 10h |
/tinycpu/trunk/ |
| 26 |
Added extra check to make sure fetcher works properly after memory write |
earlz |
4366d 11h |
/tinycpu/trunk/ |
| 25 |
Wait for memory state now works as expected, and opcode `mov [reg], immd` works now |
earlz |
4366d 15h |
/tinycpu/trunk/ |
| 24 |
Good news, mov to IP actually works as expected! |
earlz |
4367d 09h |
/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 |
4367d 09h |
/tinycpu/trunk/ |
| 22 |
Added to process sensitivity list to avoid warning and added ELSE for IR so it doesn't generate a latch |
earlz |
4368d 01h |
/tinycpu/trunk/ |
