Systems and methods are disclosed to transfer data between a first bus internal to a system-on-chip (SOC) device and a second bus external to the SOC device, each bus having a plurality of bus segments shared among a plurality of peripheral devices communicating over one or more bus segments. When reading data from a peripheral device, the system packs data by enabling each effected first bus data segment in sequence until requested data is packed; and when writing data to a peripheral device, the system unpacks data by enabling each effected second bus data segment in sequence until requested data is unpacked.