 bart
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f78729ea77
Fixed L2 cache state machine issue which was only present in the previous commit.
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1 سال پیش |
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bart
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da2bff2ea2
Removed/disabled NTSC from design, as the tiny HDMI monitor is practically always used. Also greatly increased L2 cache size, although no performance benefits for the relatively small programs I currently use for benchmarking.
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1 سال پیش |
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bart
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2fe0518bb3
Improved interrupt timing/alignment, fixing bug where interrupts are not allowed during the UART bootloader.
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1 سال پیش |
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bart
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88681ec5d0
New arbiter that further improves performance by removing latency for instruction memory access. Created instability again, which I found to be caused by bad interrupt timings. Fixed by changing the interruptValid wire to use branch_MEM for alignment. I do not know why this fixed all problems as it is very hard to simulate this issue. L1 cache should be possible again!
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1 سال پیش |
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bart
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add43b75da
L2 cache at 100MHz now greatly increases performance. Attempted to create l1i and l1d cache, but becomes unstable and the issue is difficult to similate/replicate. Therefore, all l1 cache is now bypassed and the code can be found in l1cacheUnstable.v. As no l1 cache anymore, I removed some ccache statements to increase performance as this instruction currently does nothing.
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1 سال پیش |
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bart
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9a6bf3cd52
Improved reset for cache. Disabled l2 cache as it currently reduces performance. Added more CCache instructions to code, although likely not needed. Still instability issues when L1I cache is enabled.
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1 سال پیش |
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bart
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7e81e7fa17
Added files missing from last commit (L1I cache).
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1 سال پیش |
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bart
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dfb3bbb48e
Added L1D cache. Currently only works stable when valid bit is set 0 on WRITE. Valid bit 1 after cache miss read works fine for some reason.
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1 سال پیش |
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bart
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b6831c4209
Added L2 cache (no L1 for now) between CPU and SDRAM controller. No noticable performance difference, can likely be optimized further to reduce cache hit latency.
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1 سال پیش |
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bart
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28bcde6466
New SDRAM controller that uses both SDRAM chips. Now separate bus from MU for better performance, as controller runs at 100MHz. Also updated some debug code as debugging was needed. Tested working in hardware. 2x performance boost in some cases.
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1 سال پیش |
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bart
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e1bb01a621
Cleaned and renamed Quartus project.
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2 سال پیش |
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bart
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01b9bb8f29
Added signed right shift operation to CPU, assembler, compiler, code and documentation.
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2 سال پیش |
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bart
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6e3cd7cd9c
PixelEngine now works in hardware with both HDMI and NTSC. Added pxtest and mandelbrot test programs.
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2 سال پیش |
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bart
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442d51ba85
Added images to documentation, HDMI is working without lvds, init of new sdram controller done.
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2 سال پیش |
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bart
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a76905443f
Ported Quartus to 5CEA5 FPGA. SDRAM does not seem to work.
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2 سال پیش |
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bart
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9f74a9565f
Fixed more MU I/O bugs. Updated everything from BCC except the ASM to work on new CPU. Added back flasher programs. Fixed LOAD/HI bug by using unsigned const16 instead. Updated assembler including hotfix for FPGC jumping to addr3 after UART bootloader is done. FPGC6 now basically fully works again!
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2 سال پیش |
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bart
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207413dd90
Assembler only needs Int: function, fixed position of program lenght. Ported ROM and UART bootloader over from FPGC5. Updated documentation on interrupts. Added resets. Fixed bug in MU. Increased stack size. Tested everything in hardware. Probably some other fixes and things I forgot.
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2 سال پیش |
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bart
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b74702c915
Created full FPGC6 verilog simulation, added Quartus code from FPGC5 with CPU from FPGC6. Works in hardware, but has combination loop somewhere at the arbiter and the registerbank and stack are not using block ram
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2 سال پیش |
