pulp-platform/common_cells v1.24.0

on GitHub

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