====== 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.