fpga-exper - FPGA experiments

Age	Commit message (Collapse)	Author
22 hours	eater: PC inc included, decode on negedgemain	uvok
	Some cycles can be saved. As previously (wrongly) committed, the PC can be incremented early, but the decoder needs to do this "early", so as now implemented, on the falling clock adge already.
22 hours	Get rid of JMP_NOP	uvok

23 hours	Implement JMP	uvok
	and get rid of arbitrary run limitation.
23 hours	Implement LDI	uvok

23 hours	Implement STA	uvok

23 hours	Put instructions into std::vector	uvok

23 hours	Implement sub instruction	uvok

46 hours	Document SUB command	uvok

46 hours	remove missing include	uvok

46 hours	eater: Use correct opcodes	uvok
	I was off-by-one?
46 hours	Explain separate PC++ state	uvok
	need to get correct next state, once INS is loaded.
46 hours	Revert "eater: Combine counting in prev. state"	uvok
	This reverts commit 1f0fc1edcea04e5c1f04803f0bdda337c2245f09.
4 days	Add halt state and flag	uvok

4 days	eater: Combine counting in prev. state	uvok
	save 1 cycle, as explained in video. also, only print lo->hi clk states to term.
4 days	eater: Add subtract flag	uvok

4 days	eater: Print most control signals	uvok

4 days	eater,sim: Make decoder state actually public-flar	uvok

4 days	eater,sim: Reformat and extract func	uvok

4 days	eater: Add verilator/cmake project	uvok

4 days	eater: Implement leftover states and state transitions	uvok

4 days	eater: Add logic to switch between manual and automatic flags	uvok

4 days	eater: Use control flag struct in computer	uvok

4 days	Add instruction decoder with FSM	uvok

4 days	Fix eater_types for Icarus	uvok

4 days	Add typer, preparation for SM	uvok

5 days	eater: update docs	uvok

5 days	eater: Add simpc makefile snippet	uvok

5 days	eater: Make ALUresult verilator-public	uvok

5 days	eater: Make bs a tri0	uvok
	because eater_computer has pull-downs on bus
5 days	eater: Add OUT reg	uvok

5 days	eater: document	uvok

5 days	eater: Test more signals	uvok

5 days	eater:PC clock runs on neg clock	uvok

5 days	eater: Use separate "zbuffer" module	uvok
	keeps code a bit cleaner
5 days	Add zbuffer spec	uvok
	remove "debug_bus"
6 days	eater: Add PC, fix signals for MEM/ADR, add readme	uvok

7 days	Add RAM and RAM_ADR register	uvok

7 days	eater: Connect RAM	uvok

7 days	eater: Include RAM	uvok

7 days	(System)Verilog: Be explicit about wire/logic	uvok

7 days	eater: Use "actual -" for alu	uvok
	better synthesis?
7 days	eater: Extract computer testbench	uvok

7 days	eater_alu: Use 2complneg instead of subtract	uvok

7 days	eater: Add ALU	uvok
	while doing so, add always_out port for regs
7 days	Better tb for eater cpu	uvok

8 days	Add instruction register	uvok

8 days	eater: reg data out en is async	uvok

8 days	Add 1st sketch of eater cpu	uvok