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## Project Change Log
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## Project Change Log
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The most recent **NEORV32** project version can be found on top of this list.
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The most recent **NEORV32** project version can be found on top of this list.
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"Officially released" versions are linked and highlighted (:rocket:).
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"Officially released" versions are linked and highlighted :rocket:.
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The latest release is [](https://github.com/stnolting/neorv32/releases).
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The latest release is [](https://github.com/stnolting/neorv32/releases).
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A list of all releases can be found [here](https://github.com/stnolting/neorv32/releases). The most recent version of the *NEORV32 data sheet*
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A list of all releases can be found [here](https://github.com/stnolting/neorv32/releases). The most recent version of the *NEORV32 data sheet*
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can be found [here](https://raw.githubusercontent.com/stnolting/neorv32/master/docs/NEORV32.pdf) (pdf).
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can be found [here](https://raw.githubusercontent.com/stnolting/neorv32/master/docs/NEORV32.pdf) (pdf).
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The processor can determine its version from the `mimpid` CSR (at CSR address 0xf13). A 2x4-bit decimal-coded representation is used. Leading
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:information_source: To see a list of all commits
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between release run `git log v1.4.7.0..v1.4.8.0` (example to to see commits between v1.4.7.0 and v1.4.8.0).
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The processor can determine its version from the `mimpid` CSR (at CSR address 0xf13). A 8x4-bit BCD representation is used. Leading
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zeros are optional. Example: `CSR(mimpid) = 0x01040312 => 01.04.03.12 = Version 01.04.03.12 = v1.4.3.12`
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zeros are optional. Example: `CSR(mimpid) = 0x01040312 => 01.04.03.12 = Version 01.04.03.12 = v1.4.3.12`
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For the HDL sources the version number is globally defined by the `hw_version_c` constant in the main VHDL package file
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For the HDL sources the version number is globally defined by the `hw_version_c` constant in the main VHDL package file
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[`rtl/core/neorv32_package.vhd`](https://github.com/stnolting/neorv32/blob/master/rtl/core/neorv32_package.vhd).
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[`rtl/core/neorv32_package.vhd`](https://github.com/stnolting/neorv32/blob/master/rtl/core/neorv32_package.vhd).
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| Date (*dd.mm.yyyy*) | Version | Comment |
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| Date (*dd.mm.yyyy*) | Version | Comment |
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|:----------:|:-------:|:--------|
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|:----------:|:-------:|:--------|
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| 19.12.2020 | 1.4.9.0 | Testbench: added memory-mapped triggers to trigger core's "machine software & external interrupts"; `sw/example/cpu_test`: removed CFU tests, added `MEI` and `MSI` tests; added **RISC-V-Compliance Test Framework** to repository (`riscv-compliance/`), core passes all `rv32` tests (riscv-compliance v2.1) |
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| 26.12.2020 | 1.4.9.4 | removed `zicnt_en` option (was used to discard the standard RISC-V counters and timers from implementation); added missing `mcounteren` CSR (to allow read-access from user-level code to `cycle[h]` / `time[h]` / `[m]instret[h]` CSRs); available bits: 0: `CY`, 1: `TM`, 2: `IR`; added missing `mcountinhibit` CSR (to disable auto-increment of `[m]cycle[h]` / `[m]instret[h]` CSRs); available bits: 0: `CY`, 2: `IR` |
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| 25.12.2020 | 1.4.9.3 | Added missing `UBE` flag to `mstatus` CSR, indicates Endianness for load/stores in user mode (always set indicating BIG-endian mode), is a copy of `mstatush.mbe` |
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| 23.12.2020 | 1.4.9.2 | :sparkles: added processor-internal instruction cache `rtl/core/neorv32_cache.vhd` (direct mapped); new configuration generics: `ICACHE_USE` (implement cache), `ICACHE_BLOCK_SIZE` (cache block/page/line size), `ICACHE_NUM_BLOCKS` (number of cache blocks); added `SYSINFO_CACHE` register to SYSINFO to check cache configuration by software |
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| 20.12.2020 | 1.4.9.1 | :bug: fixed bug in CPU's instruction fetch engine (alignment_errros/bus_errors were not acknowledged correctly); added `BUS_TIMEOUT` generic to CPU (defines the amount of cycles after which an *unacknowledged* bus access will get terminated and raises a bus access fault exception) |
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| 19.12.2020 | [**:rocket:1.4.9.0**](https://github.com/stnolting/neorv32/releases/tag/v1.4.9.0) | Testbench: added memory-mapped triggers to trigger core's "machine software & external interrupts"; `sw/example/cpu_test`: removed CFU tests, added `MEI` and `MSI` tests; added **RISC-V-Compliance Test Framework** to repository (`riscv-compliance/`), core passes all `rv32` tests (riscv-compliance v2.1) |
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| 18.12.2020 | 1.4.8.13 | Added additional simulation files: simulation-optimized IMEM-ROM (so far, this is only relevant for the *new* NEORV32 RISC-V Compliance test framework v2.0); **:sparkles: Processor now passes all `rv32` tests of the new [RISC-V Compliance Test Framework v2.0](https://github.com/riscv/riscv-compliance/releases/tag/v2.0) :sparkles:** |
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| 18.12.2020 | 1.4.8.13 | Added additional simulation files: simulation-optimized IMEM-ROM (so far, this is only relevant for the *new* NEORV32 RISC-V Compliance test framework v2.0); **:sparkles: Processor now passes all `rv32` tests of the new [RISC-V Compliance Test Framework v2.0](https://github.com/riscv/riscv-compliance/releases/tag/v2.0) :sparkles:** |
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| 16.12.2020 | 1.4.8.12 | :warning: fixed (another) bug in `mtval` CSR generation (wrong value for "breakpoint" trap); updated `mtval` value table in data sheet; fixed bug in load/store operation (intoroduced in version 1.4.8.10) |
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| 16.12.2020 | 1.4.8.12 | :warning: fixed (another) bug in `mtval` CSR generation (wrong value for "breakpoint" trap); updated `mtval` value table in data sheet; fixed bug in load/store operation (intoroduced in version 1.4.8.10) |
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| 16.12.2020 | 1.4.8.11 | :warning: fixed bug in `mtval` CSR generation (wrong values for some traps); fixed bug in `mip` CSR (writing zero to implemented bits now actually clears pending interrupts); fixed bug in IRQ priority encoding (machine software interrupt `MSI` comes before machine timer interrupt `MTI`) |
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| 16.12.2020 | 1.4.8.11 | :warning: fixed bug in `mtval` CSR generation (wrong values for some traps); fixed bug in `mip` CSR (writing zero to implemented bits now actually clears pending interrupts); fixed bug in IRQ priority encoding (machine software interrupt `MSI` comes before machine timer interrupt `MTI`) |
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| 12.12.2020 | 1.4.8.10 | :warning: fixed wrong `trap_reset_c` encoding (in it's expanded form it should be 0x80000000) and reset logic: hardware `mcause` register is now set to `trap_reset_c` after a hardware reset; crt0.S start-up code now sets `mcause` to `trap_reset_c` after finishing hardware setup |
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| 12.12.2020 | 1.4.8.10 | :warning: fixed wrong `trap_reset_c` encoding (in it's expanded form it should be 0x80000000) and reset logic: hardware `mcause` register is now set to `trap_reset_c` after a hardware reset; crt0.S start-up code now sets `mcause` to `trap_reset_c` after finishing hardware setup |
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| 11.12.2020 | 1.4.8.9 | Added option to exclude standard RISC-V performance counters (`[m]cycle[h]` and `[m]instret[h]`) for size-constrained implementations; disabled by setting VHDL package's `zicnt_en_c` constant to false; software can determine state of `zicnt_en_c` via `mzext` CSR's `CPU_MZEXT_ZICNT` bit; added new signal to processor top entity: `mtime_i`, this signal is used for updateting the `time[h]` CSRs if the processor-internal MTIME unit is disabled (via `IO_MTIME_USE` = `false`) |
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| 11.12.2020 | 1.4.8.9 | Added option to exclude standard RISC-V performance counters (`[m]cycle[h]` and `[m]instret[h]`) for size-constrained implementations; disabled by setting VHDL package's `zicnt_en_c` constant to false; software can determine state of `zicnt_en_c` via `mzext` CSR's `CPU_MZEXT_ZICNT` bit; added new signal to processor top entity: `mtime_i`, this signal is used for updateting the `time[h]` CSRs if the processor-internal MTIME unit is disabled (via `IO_MTIME_USE` = `false`) |
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