serial interface
If data has been published, by serial number or features.
32 bit data transfers
electrons
A bus consists of wires which is used to transfer data either in serial or parallel transmission.
By the features and serial number. Blue Book of Gun Values has sn data.
The direction of data flow for data transfers are different by these to reasons MP3 files are downloaded from the PC to the MP3 player, in contrast to digital cameras, which transfers or uploads to the PC.
If sn data has been published you can find out when it was made/shipped and sometimes to who and with what features.
With a Microcontroller look at it serial would be better than parallel when you have very few I/O pins or when you want to reserve extra I/O pins for other purposes.A cost-of-wire approach would prove that serial is better because the fewer wires would have a lower cost then that of parallel communicationComputer case airflow would also indicate that serial can be better. With multiple harddrives in a computer sata cables will not disrupt the airflow as much as their much larger PATA flat cable counterparts. Although depending on where components are located and what type of cooling is used would be factors for this argument.
http://pinouts.ru/Slots/USB_pinout.shtml This uses the standard FRONT and TOP numbered view, labeling +5VDC, data + and -, and ground. Enjoy; apologies for brevity.
serial chip
DMA