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microwatt/fpga
Michael Neuling b90a0a2139
Merge pull request #208 from paulusmack/faster
Make the core go faster

Several major improvements in here:
- Simple branch predictor
- Reduced latency for mispredicted branches and interrupts by removing fetch2 stage
- Cache improvements
  o Request critical dword first on refill
  o Handle hits while refilling, including on line being refilled
  o Sizes doubled for both D and I
- Loadstore improvements: can now do one load or store every two cycles in most cases
- Optimized 2-cycle multiplier for Xilinx 7-series parts using DSP slices
- Timing improvements, including:
  o Stash buffer in decode1
  o Reduced width of execute1 result mux
  o Improved SPR decode in decode1
  o Some non-critical operation take a cycle longer so we can break some long combinatorial chains
- Core logging: logs 256 bits of info every cycle into a ring buffer, to help with debugging and performance analysis

This increases the LUT usage for the "synth" + A35 target from 9182 to 10297 = 12%.
4 years ago
..
LICENSE Initial import of microwatt 5 years ago
arty_a7.xdc spi: Add SPI Flash controller 4 years ago
clk_gen_bypass.vhd Fix clk_gen_bypass 5 years ago
clk_gen_mcmm.vhd Improve PLL/MMCM clocks configuration 5 years ago
clk_gen_plle2.vhd Improve PLL/MMCM clocks configuration 5 years ago
cmod_a7-35.xdc Add SPI configuration to Xilinx constraint files 5 years ago
firmware.hex Add a few more FPGA related files 5 years ago
hello_world.hex hello_world: Use new headers and frequency from syscon 5 years ago
main_bram.vhdl Fix some ghdlsynth issues with fpga_bram 5 years ago
nexys-video.xdc spi: Add SPI Flash controller 4 years ago
nexys_a7.xdc Add SPI configuration to Xilinx constraint files 5 years ago
pp_fifo.vhd pp_fifo: Fix full fifo losing all data on simultaneous push & pop 5 years ago
pp_soc_uart.vhd uart: Remove combinational loops on ack and stall signal 4 years ago
pp_utilities.vhd Initial import of microwatt 5 years ago
soc_reset.vhdl soc_reset: Use counters, add synchronizers 5 years ago
soc_reset_tb.vhdl Exit cleanly from testbench on success 5 years ago
top-arty.vhdl Merge pull request #208 from paulusmack/faster 4 years ago
top-generic.vhdl soc: Don't require dram wishbones signals to be wired by toplevel 4 years ago
top-nexys-video.vhdl soc: Rename wb_dram_ctrl to wb_ext_io and rework decoding 4 years ago