The Connectivity Chip is a nRF51822 flashed by firmware capable of decoding serialized SoftDevice commands and issue the corresponding call to the underlying BLE S110 Firmware using the hardware delivered in the nRF51822.

The source code and project file can be found in the:

Board nRF6310: <InstallFolder>\Nordic\nrf51822\Board\nrf6310\s110\ble_connectivity

Board PCA10001: <InstallFolder>\Nordic\nrf51822\Board\pca10001\s110\ble_connectivity