SL811HS is an embedded USB Host/Slave Controller capable of communicating with either fullspeed or low-speed peripherals. The SL811HS can interface to devices, such as microprocessors,microcontrollers, DSPs, etc. The EZ-USB development kit proves to be the ideal starting platform for SL811HS development, utilizing the internal 8051 core as the MCU interface to the SL811HS,and using the EZ-USB interface for debugging purpose. Figure 1 shows the basic interconnect block diagram of the entire development platform.