Cobham Gaisler AB provides IP cores and supporting development tools for embedded processors based on the SPARC architecture. We specialize in digital hardware design for both commercial and aerospace applications


i2cslv-block The I²C slave core is a simple I²C slave that provides a link between the I²C bus and the AMBA APB. The core is compatible with the Philips I²C standard and supports 7- and 10-bit addressing with an optionally software programmable address. Standard-mode (100 kb/s) and Fast-mode (400 kb/s) operation are supported directly.


  • AMBA APB interface
  • Optional programmable I²C address - The initial address is configurable via a VHDL generic. The designer can choose to leave the core's address programmable via an APB mapped register.
  • 10-bit address support. If the core is configured without a hard coded address software may also configure the core to use 7-bit addressing.
  • Four main modes, core can be configured to force a master into wait mode by lowering the SCL line during reception and/or transmission. See GRIP manual for details.
  • Clock stretching

For more information, please see the GRLIB IP Core User's Manual


Estimation of the resource utilization for the I²CSLV can be found here:


  • The core is available under a commercial license and also under the GPL.