 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 year ago |
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bart
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52f2819774
Removed leftover ccache instructions from debugging instability problems. Commented out required ccache instructions for when L1I cache returns in the future.
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1 year ago |
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bart
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9a285550c0
Updated documentation a bit, added newlines to BENCH, removed wrong comments from L2cache.v
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1 year ago |
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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 year ago |
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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 year ago |
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bart
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5af536210d
Fixed instability by adding clear cache instruction during SPI transfer. No idea why this fixed the issue, as the I/O address range is above the limit for cache to work.
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1 year ago |
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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 year ago |
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bart
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7e81e7fa17
Added files missing from last commit (L1I cache).
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1 year ago |
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bart
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3253b1bc2c
Added L1I cache. Added clear cache instruction, which is now added in the UART bootloader and BDOS program loaders. Fixed too fast read part in SPI flasher. Snake userbdos program now sometimes crashes, which needs further investigation.
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1 year ago |
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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 year ago |
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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 year ago |
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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 year ago |
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bart
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240770cb51
Progress on asm for bcc with new architecture. Started on SDRAM testbench for new controller.
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1 year ago |
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bart
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1a2f5e6c55
Added qws Quartus file.
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1 year ago |
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bart
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e1bb01a621
Cleaned and renamed Quartus project.
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1 year ago |
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bart
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d602419429
Added support for negative ints in .dw for python assembler.
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1 year ago |
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bart
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7e822dcae0
Made assembly for rendering mandelbrot program, with other improvements as well.
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2 years ago |
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bart
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19b70deac8
Added support for signed .dw instructions.
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2 years ago |
 Bart
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cf2db3b9cd
Merge pull request #1 from b4rt-dev/PixelEngine
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2 years ago |
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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 years ago |
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bart
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4dd2ff7765
Merged from main.
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2 years ago |
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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 years ago |
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bart
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7b14d2d273
Improved Pixel Engine.
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2 years ago |
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bart
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6dc8fc396f
Added Pixel Engine in simulation.
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2 years ago |
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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 years ago |
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bart
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308cc6a90d
Fixed SDRAM controller by setting phase shift to 180 degrees.
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2 years ago |
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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 years ago |
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b4rt-dev
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8d56c91fea
Added fast (but inaccurate) and accurate (but slow) option for UART flasher.
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2 years ago |
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b4rt-dev
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118fe8b319
Improved new button check in USB keyboard driver of BDOS
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2 years ago |
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b4rt-dev
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c4599a63cc
New documentation structure. Updated some documentation. Added relevant graphics scripts and files from FPGC5 repo.
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2 years ago |
