 bart
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69d109e653
Added hardware signed and unsigned integer division and modulo. Created simple integer calculator to test. Updated several programs and BDOS to use new division hardware while keeping software calculation as legacy functions.
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преди 1 година |
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bart
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f3f3a43044
Added fixed-point signed divider to MU. Integrated into FPCALC.
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преди 1 година |
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bart
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3af9eecaa9
Added signed fixed point multiplication to ALU.
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преди 1 година |
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bart
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9294ee0605
Removed unused PLLs from quartus design. Replaced main PLL with Cyclone V PLL.
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преди 1 година |
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bart
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f78729ea77
Fixed L2 cache state machine issue which was only present in the previous commit.
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преди 1 година |
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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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преди 1 година |
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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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преди 1 година |
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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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преди 1 година |
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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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преди 1 година |
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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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преди 1 година |
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bart
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7e81e7fa17
Added files missing from last commit (L1I cache).
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преди 1 година |
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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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преди 1 година |
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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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преди 1 година |
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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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преди 1 година |
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bart
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e1bb01a621
Cleaned and renamed Quartus project.
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преди 1 година |
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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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преди 2 години |
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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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преди 2 години |
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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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преди 2 години |
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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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преди 2 години |
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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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преди 2 години |
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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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преди 2 години |
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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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преди 2 години |
