v2.0.0-beta.3

2.0.0-beta.3 - 2026-07-29

Added

• cc_heaviside: Add open-source formal verification and document saturation behavior

Fixed

• Deprecated stream arbiter wrappers: Fix elaboration with Synopsys Fusion Compiler

v2.0.0-beta.2

2.0.0-beta.2 - 2026-07-16

Changed

• README: Update cell names, links, and API documentation for v2

Fixed

• cc_fifo, cc_delta_counter: Use named synchronous clear signals for Synopsys Fusion Compiler compatibility
• cc_binary_to_gray: Fix the lint for the Width == 1 special case
• assertions.svh: Use the built-in XILINX_SIMULATOR macro to disable assertions under Xilinx simulation
• cc_trip_counter: Fix the CounterExceedsBound assertion on trip cycles and document exact-bound behavior

v2.0.0-beta

2.0.0-beta - 2026-07-02

Added

• Add deprecated v1 compatibility wrappers for renamed modules, packages, register macros and formal properties
• Add cc_no_deprecated Bender target for strict v2-only builds
• Add cc_pkg and merge cf_math_pkg, ecc_pkg, and CDC reset-control types into it
• Add cc_delta_counter, cc_majority_vote_filter, cc_serial_deglitch and cc_onehot
• Add formal checks for cc_cdc_reset_ctrlr and cc_lzc
• Add timed CDC test coverage for 2-phase, 4-phase, FIFO, gray FIFO, and clearable CDC paths

Changed

• Move the generic sync cell to tech_cells_generic
• Prefix public RTL modules, interfaces, testbenches, and formal properties with cc_
• Rename ports to _i/_o, parameters to UpperCamelCase, and type parameters to *_t
• Replace string parameters with enums and integer-like parameters with typed int unsigned or bit
• Convert dependent parameters to localparams where they are not part of the public API
• Add synchronous clr_i support to sequential cells and update register macro defaults
• Rename fifo_v3 to cc_fifo and shift_reg to cc_shift_register
• Remove testmode_i from cc_fifo and dependent modules
• Fold stream_arbiter_flushable into cc_stream_arbiter
• Rename the functional clear of cc_serial_deglitch to restart_i
• Restructure CDC implementations with explicit source/destination sides and unify configurable synchronizer parameters
• Extend CI with Bender-based formal runs, Slang, Verible, Verilator, Questa/VCS elaboration, and SpyGlass lint

Fixed

• cc_popcount: Fix output width
• cc_lzc: Fix non-power-of-two widths and add formal coverage
• cc_fifo: Fix usage_o truncation for power-of-two depths
• cc_rr_arb_tree: Fix inconsistent grant behavior for NumIn == 1
• cc_passthrough_stream_fifo: Fix pointer updates under full handshakes
• cc_cdc_reset_ctrlr: Keep async reset-control payloads contained inside the CDC
• cc_cdc_fifo_gray_clearable: Preserve async reset-control timing across sync-stage configurations
• Fix Verilator IMPLICIT, UNOPTFLAT, MULTIDRIVEN, and selected width warnings
• Fix SpyGlass lint findings and improve elaboration/tool compatibility

Removed

• Remove already-deprecated legacy modules that are not part of the v1 compatibility wrapper set
• Remove Travis CI and replace the old lint workflow with the new CI setup

v1.40.0

1.40.0 - 2026-07-02

Fixed

• stream_mux: Fix select width for N_INP == 1
• clk_int_div: Fix SpyGlass W415a lint issue
• cdc_*_tb: Fix mailbox type mismatch
• common_cells.core: Add missing source file
• Bender.yml: Exclude deprecated sram.sv when targeting CVA6
• README: Fix register macro formatting

v1.39.0

1.39.0 - 2025-11-20

Added

• boxcar: Add boxcar function to compose bit masks
• heaviside: Add Heaviside function to compose bit masks
• ring_buffer: Add ring buffer with sequential write and random reads
• trip_counter: Add counter with 'trip' output when reaching threshold value

Changed

• cb_filter, id_queue, lzc, rr_arb_tree: Speed up Verilator simulation
• cdc_fifo_gray*, isochronous_spill_register: Change flip-flops without to flip-flops with reset
• isochronous_spill_register: Remove unnecessary data stability assertions
• addr_decode*: Change assumed integer index to arbitrary type (default remains integer)

Fixed

• id_queue: Fix struct access
• cdc_fifo_gray*: Fix Spyglass linting edge case
• lzc: Fix assertion for degenerate case WIDTH == 0
• Fix Verilator compilation by adding guard statements

v1.38.0

1.38.0 - 2025-02-28

Changed

• Assertions no longer disabled for Verilator. Define ASSERTS_OFF to disable.
• Define ASSERTS_OVERRIDE_ON to override any defines that turn assertions off otherwise.
• id_queue: Parametrize number of compare ports.
• assertions.svh: Add optional argument to assertion macros to display custom error message.
• stream_to_mem: Disable assertions during reset.
• addr_decode_dync, cdc_fifo_gray_clearable, multiaddr_decode, spill_register_flushable: Promote $warning to $error.
• rr_arb_tree, stream_omega_net, stream_xbar: Remove default assertion disable.

Fixed

• delta_counter: Fix inverted reset.
• stream_join_dynamic: Handshake only selected streams.
• Various tool compatibility improvements.

v1.37.0

1.37.0 - 2024-07-18

Added

• credit_counter: Add up/down counter for credit.

Fixed

• mem_to_banks_detailed: Ensure no spurious response after full dead write.

v1.36.0

1.36.0 - 2024-07-08

Fixed

• registers: Fix else statement in FFARNC macro.
• stream_arbiter_flushable: Do not lock priority arbiter.

v1.35.0

1.35.0 - 2024-04-22

Changed

• id_queue: Add parameter to cut a critical path.

v1.34.0

1.34.0 - 2024-04-09

Changed

• stream_xbar: Add payload assertion stability mask.