Main Board Overview

This is the board that everything connects to. It is what the TQMa6x SOM plugs into, and contains all the circuitry needed to run it. It also contains the pic32.

Chips

In no particular order:

part	location	ref	description & notes
SMSC USB2660i	top	IC601	Dual SD card reader with integrated USB hub. Appears to be connected to the SOM's second root hub. First external downstream port connected to the SMSC USB2514Bi.
SMSC USB2514Bi	bottom	IC800	4 port USB hub. Third downstream port connected to the FTDI chip.
FTDI FT231XQ	bottom	IC805	USB to UART converter for the barcode reader.
SMSC USB2512Bi	bottom	IC600	2 port USB hub. Possibly only accessible by the usb_service connector.
PCF2129T	bottom	IC200	RTC, battery backed.
24LC64	bottom	IC503	8kbyte i2c EEPROM, probably for the pic32.
ST 24c04wp	bottom	IC603	512byte i2c EEPROM, maybe for the USB2660i's configuration data?
KSZ9031MNXIC	top, under SOM	IC(4?)00	Ethernet phy.
TI TS3A5018	top, under SOM	IC301	Marked “ya018”. Analog switches, maybe for the SPI flash?
25Q128A	top, under SOM	IC302	16Mbyte serial NOR flash. Contains the bootloader for the SOM.
74HCT4051	top, under SOM	IC50(?), IC502	Two analog switch chips, might be USB related.
PIC32MX795F512L	bottom	IC500	pic32
-	top	IC902	Unpopulated footprint for a TI WL18xx WiLink module.

There are a few more scattered around. Most are likely for power management, but this list is also missing an audio amplifier.