I2C Target IP Core

Bus Interface for I2C Protocol

I2C (Inter-Integrated Circuit) bus is a simple, low-bandwidth, short-distance protocol. It is often seen in systems with peripheral devices that are accessed intermittently. It is commonly used in short-distance systems, where the number of traces on the board should be minimized. The device that initiates the transmission on the I2C bus is commonly known as the Controller, while the device being addressed is called the Target.

Lattice Semiconductor general-purpose I2C Target IP Core provides device addressing, read/write operation and an acknowledgement mechanism. The programmable nature of FPGA provides users with the flexibility of configuring the I2C Target device to any legal target address, thus, avoiding a potential target address collision on an I2C bus with multiple target devices.

Three Modes for Different Bus Speeds - Supports 7-bit and 10-bit Addressing Mode, supporting the bus speeds: Standard-mode (Sm) – up to 100 kbit/s, Fast-mode (Fm) – up to 400 kbit/s and Fast-mode Plus (Fm+) – up to 1 Mbit/s

Features

  • Integrated Pull-up and Glitch filter
  • Polling and Out-of-band Interrupt Modes
  • Supports Clock stretching
  • Configurable ACK/NACK response on address and data phases

Block Diagram

Resource Utilization

LAV-AT-500E-1LFG1156I
Configuration Clk Fmax (MHz)* Registers LUTs EBRs
Default 107 320 394 0
APB Mode Enable: false,
Others = Default
251 318 394 0
Implementation of FIFO = EBR,
Others = Default
127 304 372 2
TX FIFO Almost Empty Flag: 1,
RX FIFO Almost Full Flag: 1,
Others = Default
112 320 394 0
FIFO Depth: 256,
TX FIFO Almost Empty Flag: 256,
RX FIFO Almost Full Flag: 256,
Others = Default
105 350 910 0

Note: Fmax is generated when the FPGA design only contains I2C Target IP Core, and the target frequency is 50MHz. These values may be reduced when user logic is added to the FPGA design.

LFMXO5-25-9BBG400I
Configuration Clk Fmax (MHz)* Registers LUTs EBRs
Default 168 319 397 0
APB Mode Enable: false,
Others = Default
200 304 370 0
Implementation of FIFO = EBR,
Others = Default
157 303 364 2
TX FIFO Almost Empty Flag: 1,
RX FIFO Almost Full Flag: 1,
Others = Default
168 319 385 0
FIFO Depth: 256,
TX FIFO Almost Empty Flag: 256,
RX FIFO Almost Full Flag: 256,
Others = Default
167 349 1088 0

Note: Fmax is generated when the FPGA design only contains I2C Target IP Core, and the target frequency is 50MHz. These values may be reduced when user logic is added to the FPGA design.

LFMXO5-25-7BBG400I
Configuration Clk Fmax (MHz)* Registers LUTs EBRs
Default 101 319 385 0
APB Mode Enable: false,
Others = Default
120 304 370 0
Implementation of FIFO = EBR,
Others = Default
103 303 365 2
TX FIFO Almost Empty Flag: 1,
RX FIFO Almost Full Flag: 1,
Others = Default
94 319 385 0
FIFO Depth: 256,
TX FIFO Almost Empty Flag: 256,
RX FIFO Almost Full Flag: 256,
Others = Default
101 349 1089 0

Note: Fmax is generated when the FPGA design only contains I2C Target IP Core, and the target frequency is 50MHz. These values may be reduced when user logic is added to the FPGA design.

Ordering Information

Available for free to use in Lattice Radiant design software.

Documentation

Quick Reference
TITLE NUMBER VERSION DATE FORMAT SIZE
Select All
I2C Target IP Core - User Guide
FPGA-IPUG-02072 1.7 1/28/2024 PDF 706.8 KB

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