| Rev |
Log message |
Author |
Age |
Path |
| 32 |
Finished up changes needed to make memory reading actually work.
Push and Pop now work |
earlz |
4408d 16h |
/tinycpu/trunk/ |
| 31 |
Removed the infamous TRData latch from ALU. Now synthesizes (sorta) warning free. No latches are used. |
earlz |
4409d 11h |
/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 |
4409d 12h |
/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 |
4412d 18h |
/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 |
4413d 13h |
/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 |
4413d 19h |
/tinycpu/trunk/ |
| 26 |
Added extra check to make sure fetcher works properly after memory write |
earlz |
4413d 20h |
/tinycpu/trunk/ |
| 25 |
Wait for memory state now works as expected, and opcode `mov [reg], immd` works now |
earlz |
4414d 00h |
/tinycpu/trunk/ |
| 24 |
Good news, mov to IP actually works as expected! |
earlz |
4414d 18h |
/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 |
4414d 18h |
/tinycpu/trunk/ |
| 22 |
Added to process sensitivity list to avoid warning and added ELSE for IR so it doesn't generate a latch |
earlz |
4415d 10h |
/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 |
4415d 10h |
/tinycpu/trunk/ |
| 20 |
fuck it. All sorts of broken, will try to fix it tomorrow |
earlz |
4416d 10h |
/tinycpu/trunk/ |
| 19 |
Got beginning of core/decoder for the CPU |
earlz |
4416d 11h |
/tinycpu/trunk/ |
| 18 |
Finished memory controller |
earlz |
4419d 21h |
/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 |
4420d 10h |
/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 |
4423d 13h |
/tinycpu/trunk/ |
| 15 |
Added README, LICENSE, and the (so far not created) incdec component |
earlz |
4425d 10h |
/tinycpu/trunk/ |
| 14 |
Added ALU with all the operations we'll need. Synthesizes as well trivially |
earlz |
4425d 18h |
/tinycpu/trunk/ |
| 13 |
Forgot about the new library I added |
earlz |
4425d 21h |
/tinycpu/trunk/ |
| 12 |
registerfile has ports for every register now
makefile now uses GHW file format for gtkwave instead of VCD |
earlz |
4425d 22h |
/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 |
4429d 11h |
/tinycpu/trunk/ |
| 10 |
Just committing so I can keep this original that passes simulation, but still synthesizes to LUTs |
earlz |
4429d 12h |
/tinycpu/trunk/ |
| 9 |
Trying to add a byte-enable to the RAM. Used Xilinx's template for it, but ghdl won't pass the testbench |
earlz |
4429d 19h |
/tinycpu/trunk/ |
| 8 |
Added blockram for inferring actual block RAM.
Now we need a memory controller, not a crappy memory emulation thing |
earlz |
4430d 19h |
/tinycpu/trunk/ |
| 7 |
Changed memory to fix bound check error
Decreased size of RAM since 4096 bytes of RAM would require an FPGA with more than 32K flip-flops (mine has ~4000) |
earlz |
4430d 20h |
/tinycpu/trunk/ |
| 6 |
Reworked memory code to hopefully synthesize better |
earlz |
4431d 00h |
/tinycpu/trunk/ |
| 5 |
Modified registerfile to be dual-port for both read and write |
earlz |
4431d 11h |
/tinycpu/trunk/ |
| 4 |
Added internal memory interface
Updated design |
earlz |
4431d 19h |
/tinycpu/trunk/ |
| 3 |
Updated registerfile to have 2 read ports
Added super rough design document mainly just for brainstorming |
earlz |
4432d 11h |
/tinycpu/trunk/ |
