| Rev |
Log message |
Author |
Age |
Path |
| 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 |
4393d 05h |
/tinycpu/trunk/docs/design.md.txt |
| 34 |
Implemented load and store instructions (`mov reg, [reg]` and `mov [reg], reg` respectively) |
earlz |
4396d 06h |
/tinycpu/trunk/docs/design.md.txt |
| 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 |
4396d 10h |
/tinycpu/trunk/docs/design.md.txt |
| 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 |
4397d 07h |
/tinycpu/trunk/docs/design.md.txt |
| 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 |
4400d 14h |
/tinycpu/trunk/docs/design.md.txt |
| 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 |
4401d 14h |
/tinycpu/trunk/docs/design.md.txt |
| 25 |
Wait for memory state now works as expected, and opcode `mov [reg], immd` works now |
earlz |
4401d 20h |
/tinycpu/trunk/docs/design.md.txt |
| 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 |
4403d 06h |
/tinycpu/trunk/docs/design.md.txt |
| 19 |
Got beginning of core/decoder for the CPU |
earlz |
4404d 07h |
/tinycpu/trunk/docs/design.md.txt |
| 17 |
Added fetch component for fetching from memory to instruction register
Added additional testing for carryover to make sure it's correct |
earlz |
4408d 06h |
/tinycpu/trunk/docs/design.md.txt |
| 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 |
4411d 09h |
/tinycpu/trunk/docs/design.md.txt |
| 14 |
Added ALU with all the operations we'll need. Synthesizes as well trivially |
earlz |
4413d 14h |
/tinycpu/trunk/docs/design.md.txt |
| 5 |
Modified registerfile to be dual-port for both read and write |
earlz |
4419d 07h |
/tinycpu/trunk/docs/design.md.txt |
| 4 |
Added internal memory interface
Updated design |
earlz |
4419d 15h |
/tinycpu/trunk/docs/design.md.txt |
| 3 |
Updated registerfile to have 2 read ports
Added super rough design document mainly just for brainstorming |
earlz |
4420d 07h |
/tinycpu/trunk/docs/design.md.txt |
