SPRUJG2 December 2024 AM62D-Q1
The four UART ports of the SoC (MCU UART0, WKUP UART0, SoC UART4 and CPLD UART0) are interfaced with an FTDI Bridge FT4232HL for USB-to-UART functionality and then terminated on a micro-B USB connector (J22) on board. When the AM62D Audio EVM is connected to a Host using USB cable, the computer can establish a Virtual COM Port which can be used with any terminal emulation application. The FT4232HL device is bus powered.
Since the circuit is powered through the USB BUS, the connection to the COM port will not be lost when the EVM power is removed.
UART Port | USB-to-UART Bridge | USB Connector | COM Port |
---|---|---|---|
SoC_UART4 | FT4232HL | J22 | COM1 |
CPLD_UART0 | COM2 | ||
WKUP_UART0 | COM3 | ||
MCU_UART0 | COM4 |
The FT4232 chip is configured to operate in "Single-chip USB to four-channel UART" mode using the configuration file from an external SPI EEPROM connected to it. The EEPROM (93LC46B) supports 1Mbit/s clock rate. The EEPROM is programmable in-circuit over USB using a utility program called FT_PROG available from FTDI's web site. The FT_PROG is also used for programming the board serial number for users to identify the connected COM port with board serial number when one or more boards are connected to the computer.