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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

1.26.0 - 2022-08-26

Added

  • Add stream_throttle: restricts the number of outstanding transfers in a stream.

Changed

  • Allow out-of-bounds (i.e. '0) top end address in addr_map of addr_decode module for end of address space.
  • Update CI.

1.25.0 - 2022-08-10

Added

  • Add addr_decode_napot: variant of addr_decode which uses a base address and mask instead of a start and end address.
  • Add stream_fifo_optimal_wrap: instantiates a more optimal spill_register instead of a stream_fifo for depth == 2.

Changed

  • Make stream_register truly stream by replacing internal FIFO with FFs.
  • Avoid using $bits() call in id_queue's parameters.
  • Remove cb_filter and cb_filter_pkg from from Vivado IP packager project sources due to compatibility issues.
  • Use tc_clk_mux as glitch-free muxes in rstgen_bypass to avoid combinational glitches.
  • Avoid program blocks in testbenches for simulator compatibility.

Fixed

  • Update src_files.yml and common_cells.core

1.24.1 - 2022-04-13

Fixed

  • Fix typos in Bender.yml and src_files.yml

1.24.0 - 2022-03-31

Added

  • Add edge_propagator_ack: Edge/pulse propagator with sender-synchronous receive-acknowledge output. edge_propagator is now implemented by instantiating edge_propagator_ack.
  • Add 4phase_cdc: A 4 phase handshaking CDC that allows glitch-free resetting (used internally in the new clearable CDC IPs).
  • Add one-sided clearable and/or async resettable flavors of 2phase CDC (cdc_2phase_clearable) and gray-counting FIFO CDCs (cdc_fifo_gray_clearable).
  • Add reset CDC controller cdc_reset_ctrl that supports reset/synchronous clear sequencing across clock domain crossings (used internally in clearable CDC IPs).
  • Add clk_int_div arbitrary integer clock divider with at-runtime configurable divider selection and glitch-free, 50%duty cycle output clock.
  • Add an assertion to the lzc to verify parameters.

Fixed

  • Correct reset polarity in assertions in isochronous_4phase_handshake and isochronous_spill_register
  • Fix compatibility of sub_per_hash constructs with Verilator

Changed

  • Add dont_touch and async_reg attribute to FFs in sync cell.
  • Improved reset behavior documentation (in module header) of existing CDC IPs.
  • Deprecated flawed clk_div module and add elaboration warning message that will be shown for existing designs (can be disabled with optional instantiation parameter).
  • Add optional Seed parameter to stream_delay module
  • Update tech_cells_generic to 0.2.9

1.23.0 - 2021-09-05

Added

  • Add cc_onehot
  • isochronous_4phase_handshake: Isochronous clock domain crossing cutting all paths using a 4-phase handshake.
  • Changed isochronous_spill_register_tb to isochronous_crossing_tb also covering the isochronous_4phase_handshake module.
  • Make reset value of sync module parameterizable.

Changed

  • id_queue: Allow simultaneous input and output requests in FULL_BW mode

1.22.1 - 2021-06-14

Fixed

  • Remove breaking change of spill_register

1.22.0 - 2021-06-09

Added

  • Add spill_register_flushable

Changed

  • registers.svh: Merge explicit and implicit register variants into `FF and `FFL macros
  • rr_arb_tree: Allow flushing locked decision
  • Improved verific compatibility

1.21.0 - 2021-01-28

Changed

  • Remove timeprecision/timeunit arguments
  • Update common_verification to 0.2.0
  • Update tech_cells_generic to 0.2.3

1.20.1 - 2021-01-21

Changed

  • id_queue: Replace default or reset value of signals that were assigned 'x with '0.
  • id_queue: Use cf_math_pkg::idx_width() for computation of localparams.

Fixed

  • Add XSIM define guard for statements incompatible with xsim.

1.20.0 - 2020-11-04

Added

  • assertions: Assertion include header with macros (from lowrisc)

Changed

  • sram.sv: Deprecated as it has been moved to tech_cells_generic

Fixed

  • stream_register: Fix DATA_WIDTH of instantiated FIFO.
  • stream_xbar: Add missing argument in assertion error string.
  • Lint style fixes
  • stream_omega: Fix parse issue with verible.
  • src_files.yml: Fix compile order and missing modules.

1.19.0 - 2020-05-25

Added

  • stream_to_mem: Allows to use memories with flow control (req/gnt) for requests but without flow control for output data to be used in streams.
  • isochronous_spill_register: Isochronous clock domain crossing cutting all paths.
  • rr_arb_tree_tb: Systemverilog testbench for rr_arb_tree, which checks for fair throughput.
  • cf_math_pkg::idx_width: Constant function for defining the binary representation width of an index signal.

Changed

  • addr_decode: Use cf_math_pkg::idx_width for computing the index width, inline documentation.
  • lzc: Use cf_math_pkg::idx_width for computing the index width, inline documentation.
  • Bender: Change levels of modules affected by depending on cf_math_pkg::idx_width().
  • stream_xbar: Fully connected stream bassed interconnect with variable number of inputs and outputs.
  • stream_xbar: Fully connected stream-bassed interconnect with a variable number of inputs and outputs.
  • stream_omega_net: Stream-based network implementing an omega topology. Variable number of inputs, outputs and radix. Topology is isomorphic to a butterfly network.

Fixed

  • Improve tool compatibility.
  • rr_arb_tree: Properly degenerate rr_i and idx_o signals.
  • rr_arb_tree: Add parameter FairArb to distribute throughput of input requests evenly when not all inputs have requests active.
  • stream_demux: Properly degenerate inp_sel_i signal.

1.18.0 - 2020-04-15

Added

  • stream_fork_dynamic: Wrapper around stream_fork for partial forking.
  • stream_join: Join multiple Ready/Valid handshakes to one common handshake.
  • SECDED (Single Error Correction, Double Error Detection) encoder and decoder
  • SECDED Verilator-based testbench
  • Travis build for SECDED module

1.17.0 - 2020-04-09

Added

  • stream_fifo: Ready/Valid handshake wrapper around fifo_v3

1.16.4 - 2020-03-02

Fixed

  • id_queue: Fix generation of head_tail_q registers

1.16.3 - 2020-02-11

Fixed

  • Handle degenerated addr_decode with NoIndices == 1, change default parameters to 32'd0

1.16.2 - 2020-02-04

Fixed

  • Fix author section in Bender.yml

1.16.1 - 2020-02-03

Fixed

  • rr_arb_tree: Add guard SVA statement for Verilator
  • Added missing sources in Bender.yml and src_files.yml

1.16.0 - 2020-01-13

Fixed

  • Handle degenerated onehot_to_bin with ONEHOT_WIDTH == 1
  • Handle degenerated id_queue with CAPACITY == 1 or HT_CAPACITY == 1
  • Fix cdc_fifo_gray to be a safe clock domain crossing (CDC)

1.15.0 - 2019-12-09

Added

  • Added address map decoder module

Fixed

  • Handle degenerated lzc with WIDTH == 1

1.14.0 - 2019-10-08

Added

  • Added spubstitution-permutation hash function module
  • Added couning-bloom-filter module
  • spill_register: Added Bypass parameter
  • counter: Added sticky overflow
  • Added counter with variable delta
  • Added counter that tracks its maximum value

Changed

  • Added formal testbench for fifo and fall_through_regsiter

1.13.1 - 2019-06-01

Changed

  • Fix path in src_files.yml for stream_arbiter and stream_arbiter_flushable

1.13.0 - 2019-05-29

Added

  • Added exponential backoff window module
  • Added parametric Galois LFSR module with optional whitening feature
  • Added cf_math_pkg: Constant Function implementations of mathematical functions for HDL elaboration

Changed

  • Parametric payload data type for rr_arb_tree

Deprecated

  • The following arbiter implementations are deprecated and superseded by rr_arb_tree:
  • Priority arbiter prioarbiter
  • Round-robin arbiter rrarbiter

Fixed

1.12.0 - 2019-04-09

Added

  • Add priority arbiter
  • Add Pseudo Least Recently Used tree
  • Add round robin arbiter mux tree

Changed

  • Add selectable arbiter implementation for stream_arbiter and stream_arbiter_flushable. One can choose between priority (prio) and round-robin arbitration (rr).
  • Add $onehot0 assertion in one-hot to bin
  • Rework rrarbiter unit (uses rr_arb_tree implementation underneath)

1.11.0 - 2019-03-20

Added

  • Add stream fork
  • Add fall-through register
  • Add stream filter
  • Add ID queue

Changed

  • sync_wedge use existing synchronizer. This defines a single place where a tech-specific synchronizer can be defined.

Fixed

  • Fix FIFO push and pop signals in stream_register to observe interface prerequisites.
  • In fifo_v3, fix data output when pushing into empty fall-through FIFO. Previously, the data output of an empty fall-through FIFO with data at its input (and push_i=1) depended on pop_i: When pop_i=0, old, invalid data were visible at the output (even though empty_o=0, indicating that the data output is valid). Only when pop_i=1, the data from the input fell through. One consequence of this bug was that data_o of the fall_through_register could change while valid_o=1, violating the basic stream specification.

1.10.0 - 2018-12-18

Added

  • Add fifo_v3 with generic fill count
  • Add 16 bit LFSR
  • Add stream delayer
  • Add stream arbiter
  • Add register macros for RTL
  • Add shift register

Changed

  • Make number of registers of rstgen_bypass a parameter.

Fixed

  • Fix valid_i and grant_i guarantees in generic_fifo for backward compatibility.
  • LZC: Synthesis of streaming operators in ternary operators
  • Add missing entry for popcount to Bender.yml.
  • Add default values for parameters to improve compatibility with Synopsys DC and Vivado.

1.9.0 - 2018-11-02

Added

  • Add popcount circuit popcount

1.8.0 - 2018-10-15

Added

  • Add lock feature to the rrarbiter. This prevents the arbiter to change the decision when we have pending requests that remain unaknowledged for several cycles.
  • Add deglitching circuit
  • Add generic clock divider
  • Add edge detecter as alias to sync_wedge (name is more expressive)
  • Add generic counter
  • Add moving deglitcher

1.7.6 - 2018-09-27

Added

  • Add reset synchronizer with explicit reset bypass in testmode

1.7.5 - 2018-09-06

Fixed

  • Fix incompatibility with verilator
  • Fix dependency to open-source repo

1.7.4 - 2018-09-06

  • Fix assertions in fifo_v2 (write on full / read on empty did not trigger properly)

1.7.3 - 2018-08-27

Fixed

  • Use proper fifo_v2 in generic_fifo module.

1.7.2 - 2018-08-27

Added

  • Almost full/empty flags to FIFO, as fifo_v2.

Changed

  • FIFO moved to fifo_v1 and instantiates fifo_v2.

1.7.1 - 2018-08-27

Fixed

  • Revert breaking changes to fifo.

1.7.0 - 2018-08-24

Added

  • Add stream register (stream_register).
  • Add stream multiplexer and demultiplexer (stream_mux, stream_demux).
  • Add round robin arbiter (rrarbiter).
  • Add leading zero counter (lzc).

Changed

  • Deprecate find_first_one in favor of lzc.

1.6.0 - 2018-04-03

Added

  • Add binary to Gray code converter.
  • Add Gray code to binary converter.
  • Add Gray code testbench.
  • Add CDC FIFO based on Gray counters. This is a faster alternative to the 2-phase FIFO which also works if a domain's clock has stopped.

Changed

  • Rename cdc_fifo to cdc_fifo_2phase.
  • Adjust CDC FIFO testbench to cover both implementations.

1.5.4 - 2018-03-31

Changed

  • Replace explicit clock gate in fifo with implicit one.

1.5.3 - 2018-03-16

Changed

  • Remove duplicate deprecated modules.

1.5.2 - 2018-03-16

Changed

  • Remove deprecated rstgen and fix interface.

1.5.1 - 2018-03-16

Changed

  • Remove deprecated onehot_to_bin.

1.5.0 - 2018-03-14

Added

  • Add behavioural SRAM model

1.4.0 - 2018-03-14

Added

  • Clock domain crossing FIFO

Changed

  • Re-name new sync modules to resolve namespace collisions

1.3.0 - 2018-03-12

Added

  • 2-phase clock domain crossing
  • Add old common cells as deprecated legacy modules

1.2.3 - 2018-03-09

Added

  • Backwards compatibility wrapper for generic_LFSR_8bit

1.2.2 - 2018-03-09

Added

  • Backwards compatibility wrapper for generic_fifo

1.2.1 - 2018-03-09

Fixed

  • Fix an issue in the spill register which causes transactions to be lost

1.2.0 - 2018-03-09

Added

  • Add spill register

1.1.0 - 2018-03-06

Added

  • Find first zero

1.0.0 - 2018-03-02

Added

  • Re-implementation of the generic FIFO supporting all kinds of use-cases
  • Testbench for FIFO

Changed

  • Re-formatting and artistic code clean-up

0.1.0 - 2018-02-23

Added

  • Fork of PULP common cells repository