HCI UART ? what's the difference with simple UART?

For now, I’m sending bytes from FPGA (verilog) to serial at 115200 bps.

I would like to send at higher speed and connect to a bluetooth module (RN42).

• UART (SPP or HCI) and USB (HCI only) data connection interfaces.
• Sustained SPP data rates – 240Kbps (slave), 300Kbps (master)
• HCI data rates – 1.5Mbps sustained, 3.0Mbps burst in HCI mode

Then, now, I would like to implement a HCI UART in order to get max 3 Mbps.

I didn’t find anything clear about how to implement this.

Could you help me? What’s change? Should I just send my data to higher bps and it’s done?

It’s the first time I’m trying to implement another way to send data than serial.