Communication Techniques

1. Communication Techniques Design Team 2 Luke LaPointe Nick Timpf Mark VanCamp Brent Woodman Steve Zuraski www.crystalfontz.com/.../USB_Connector_End.jpg

2. Parallel Communication Parallel Communication Simultaneous data bit transfer www.quatech.com/support/figures/comfig12.gif tor_End.jpg

3. Characteristics of Parallel Parallel Communication Clock – Indicates if data is valid Crosstalk – EMI Clock Skew – Transfer Speed – Distance limited Other Signals – Handshaking – Directional Control

4. Parallel ATA Parallel Communication Parallel ATA ( PATA ) Former Standard data storage connection Hard disks, Solid State Drives, CD ROM Max. cable length of 18 inches Clock Skewing

5. Parallel Front Side Bus Parallel Communication Front Side Bus ( FSB ) … Link between CPU and Memory controller Low cost Allows multi-core processing

6. Parallel Front Side Bus Parallel Communication Front Side Bus ( FSB ) Max throughput Width (Bytes) * CLK Freq * Transfers per CLK Cycle 32 bits ( 4 Bytes) * 200MHz * 2 xfers per cycle = 1600 MB/s Fading Technology

7. Parallel IEEE-488 Bus Parallel Communication Laboratory Instrumentation Bus IEEE-488 Short-Range Been in use for over 30 years: Designed late 1960s Commonly known as HP-IB Daisy Chain Connections Employs 16 signal lines: 8 bi-directional used for data transfer 3 for handshake 5 for bus management

8. Parallel Considerations Parallel Communication Three Criteria when Choosing Parallel Speed – Bit Rate and Skew Cable Length – Crosstalk Complexity – Simple Requires only a latch to copy data to the data bus

9. New Parallel use in RF Parallel Communication Use of Parallel Communication in RF Communication In place of Morse Code (one bit at a time) Multi-input Multi-output Groups of Bits Called “Symbols” Recent Techniques such as DVB-T have transmitted over 6048 bits in parallel.

10. Serial Communication Overview The process of sending data one bit at a time sequentially over a communication channel.

11. Why use serial? Benefits Ideal over long distances Much cheaper than Parallel Can Operate at a faster frequency than parallel Synchronization Difficulties Reduced Less wires to worry about

12. Purpose for Synchronization Synchronization must be established for data transfer to occur. www.quatech.com/support/figures/comfig12.gif tor_End.jpg

13. Two Basic Types Synchronous Regulated by an external clock Requires an extra wire for clock signal Asynchronous Regulated by special signals along transmission lines www.quatech.com/support/figures/comfig12.gif tor_End.jpg

14. Synchronous Utilizes two different signals on separate lines First signal is clock signal that is shared between the two devices Second signal carries the data

15. Asynchronous Signals are specified by predetermined data transfer protocols. Preset frequency between devices Signaling sequence specifying beginning and ending of signal Frequency set at beginning of transfer Signaling sequence specifies beginning and ending of signal as well as transfer rate

16. Universal Asynchronous Receiver/Transmitter UART Common Serial Port used on ICs Used to convert parallel data to serial Utilizes shift registers

17. Universal Asynchronous Receiver/Transmitter UART Uses start and stop bits Alerts receiver of incoming data Synchronizes clocks for transfer Typically 8 data bits

18. Universal Asynchronous Receiver/Transmitter UART Can use parity bits Used for error checking Clock signal runs faster than the data transfer rate Technique used to distinguish noise from signal Data read into shift register When all data is read flag is set Possibly triggering an interrupt

19. RS-232 Standard UART can use RS-232 Standard to communicate to PC Standard establishes required voltages Driver chip

20. Serial Communication Bluetooth Why ???? NO CABLES !!!!! http://cerebralrunoff.files.wordpress.com/2008/12/news_cable_mess_03_full.png

21. Serial Communication Bluetooth WPAN -Wireless Personal Area Network ~ 30 ft Radius Multiple devices http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci837444,00.html www.home-network-help.com/how-does-bluetooth-work.html

22. Serial Communication Bluetooth Frequency Hopping 79 channels V3.0 - 5GHz antenna to boost throughput

23. Serial Communication Bluetooth Simulates serial ports RFCOMM Protocol Maps Ports for devices Sets up the buffers in memory Transparent to legacy serial devices http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci837444,00.html www.home-network-help.com/how-does-bluetooth-work.html

24. Serial Communication Bluetooth Required to set up automatically Finds signal and accepts it Uses one-time key and optional encryption Devices are recognized in the future http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci837444,00.html www.home-network-help.com/how-does-bluetooth-work.html

25. Wireless Local Area NetworkWLAN Wi-Fi 802.11 a, b, g, n Ad hoc mode Network Cards PCI

26. Wireless Local Area NetworkWLAN 802.11 vs. Bluetooth Distance Many Access points Speed/Frequency Cost Power Consumption

27. Wireless Local Area NetworkWLAN 802.11 vs. Bluetooth Younger Technology Room to Grow Coexist? Intersil, Silicon Wave and Mobilian Winner?

28. QUESTIONS