Communicate with MCP4725(DAC) through I2C

Hello,

I want to use a MCP4725(DAC) to generate an analog voltage output. And I use the I2C Master Write block in simulink to communicate with the MCP4725 through the I2C pins on an Arduino Mega 2560 board. I could successfully connect to the MCP4725 through I2C communication. I would like to use the I2C Master Write block in simulink to input data to the MCP4725, but I am confused with the format of the data input of the block. I read the documention of the I2C Master Write block and the datasheet of MCP4725. The documentation indicates that the data input should be a [N by 1] or [1 by N] array. My question is how a [N by 1] or [1 by N] array relates to the desire bytes data input into the MCP4725? The pictures below are part of the simulink model I built and part of the datasheet of MCP4725.

I appreciate any help or suggestion with my question.

Best regard,

Lin