I2C Controller IP – Slave, Parameterized FIFO, AXI Master Interface (I2C2AXI)

The DB-I2C-S-AXI-BRIDGE is an I2C Slave Controller IP Core focused on low VLSI footprint ASIC / ASSP designs not requiring internal configuration & control registers (and thus no local host CPU required), and an AXI Master interface for read/write to user system. The DB-I2C-S-AXI-BRIDGE processes the I2C protocol & physical layers, and receives & transmits bytes with respect to the I2C payload via the bridge AXI Master Interface to user registers or memory.

The DB-I2C-S-AXI-BRIDGE runs off the AXI Master external clock input within the ASIC / ASSP, providing a synchronous design while offering I2C spike filtering of SDA and SCL.

The DB-I2C-S-AXI-BRIDGE is a member of Digital Blocks DB-I2C Controller IP Core family, which includes I2C Master/Slave, I2C Master-only, and I2C Slave-only configurations.

Figure 1 depicts the DB-I2C-S-AXI-BRIDGE Core system view. The IP is configured by internal pre-synthesis parameters and post-synthesis top-level input signals, receives input clock and reset, and performs I2C Slave-Receiver transfers (for writing data to the AXI via its AXI Master Interface) and Slave-Transmitter transfers (for reading data from the AXI via the AXI Master Interface).

• I2C Slave Controller - Implements Slave-only protocol for smaller VLSI footprint, for applications requiring Slave–Receiver and Slave–Transmitter capability
• AXI Master Interface – bridging the I2C Bus to the AXI Bus
  • AXI4, AXI4-Lite, and AXI3 releases
  • AXI Master Read and write Channels
• Autonomous I2C Slave Controller:
  • No local CPU host required
  • No configuring of control/status registers
• Slave I2C Controller Modes:
  • Slave – Transmitter
  • Slave – Receiver
• Supports five I2C bus speeds:
  • Standard Mode (100 Kb/s)
  • Fast Mode (400 Kb/s)
  • Fast Mode plus (1 Mbit/s)
  • Ultra fast mode (5 Mbit/s)
  • Hs-mode (3.4 Mbit/s)
• 7- or 10-bit I2C Slave ID addressing, SCL Low Wait States
• Digital filter for the received SDA and SCL lines
• Compliance with I2C specifications:
  • Philips – The I2C-Bus Specification, Version 2.1, January 2000
  • NXP Rev 7.0 October 1, 2021
• Fully-synchronous, synthesizable Verilog RTL core, with rising-edge clocking, no gated clocks, and no internal tri-states, for easy integration into FPGA or ASICdesign flows.

• Verilog RTL Source or technology-specific netlist.
• Comprehensive testbench suite with expected results.
• Synthesis scripts.
• Installation & Implementation Guide.
• Technical Reference Manual.