Description

I am using the IIC core.

How can I determine the frequency of SCL?

解决方案

The SCL frequency is configurable. 

Based on the frequency configuration, IIC master generates the required frequency.

The clock is based on setup/hold/low_time/high_time spec timings and is generated as per IIC protocol.

The clock generation is done via state-machine.

For an XPS based I2C controller the statemachine is available in iic_control.vhd ($EDK_Install\hw\XilinxProcessorIPLib\pcores\xps_iic_vx_xx_a\hdl\vhdl).

For a Vivado based I2C controller the statemachine is available in iic_control.vhd ($Vivado_Install\data\ip\xilinx\axi_iic_v2_0\hdl\src\vhdl).