In automobiles, telematics systems include wireless communication under the global positioning system (GPS), as well as embedded computing by providing drivers with the latest information, safety features, and in-car entertainment. All the control functions required by the system are provided in the processor. The interfaces of the global positioning system, the wheel sensing device, and the tachometer can receive information about navigation, wheel speed, and engine speed, and then send this information to the LCD graphic controller for display. This system provides drivers with data on current traffic conditions, driving maps and directions, speed and fuel conditions. In an emergency, the system will provide emergency help services and can provide the exact location of the vehicle.
Entertainment features (entertain units) can access car CD-ROM players that store MP3 music files. The system navigation data used by GPS can also be stored here. MP3 music files are sent to the car's audio system and played back through the audio interface.
The interface components are connected via various buses to allow the control device to access all car entertainment and driver information systems (such as in-vehicle computers). Drivers connect to mobile devices such as laptops and PDAs via USB, Ethernet (or Bluetooth) interfaces to synchronize, upload, and download data. External multimedia devices such as portable DVD players can be connected to the controller via USB or Firewire interface. Car CD / DVD players and other car multimedia devices are networked through the MOST / Firewire (IDB1394) interface. The vehicle controller area network (CAN), serial peripheral interface, internal integrated circuit bus interface, and internal integrated circuit sound bus interface are used for secondary body control operations. Figure 1 shows a typical telematics / entertainment controller.
Altera's low-cost Cyclone FPGA series is ideal for many interface applications in telematics systems. Programmable logic allows customization of interface connections to meet the needs of many different data types. It can be used in conjunction with a pre-defined dedicated standard product (ASSP) chip to provide a flexible system as a supplement to the latter. Most functions in the telematics controller can be completed by Cyclone devices. By using a variety of off-the-shelf Altera® IP cores, such as 10/100 Ethernet Media Access Controller (MAC), PCI and CAN controllers, you can significantly reduce development costs and shorten the time to market. In addition, you can use the Altera 32-bit Nios® II embedded processor to complete the functions of a standard microcontroller in telematics applications. The perfect combination of a Cyclone device with a low-cost architecture and an Altera IP core provides the most competitive solution for large-capacity applications.
Figure 1. Telematics / entertainment controller
Notes :
SPI = serial peripheral interface
I / C = internal integrated circuit bus
12S = internal integrated circuit sound bus
ATAPI = Packet interface of additional equipment on AT computer
PWM = pulse width modulation
Based on its efficient device architecture, Cyclone devices can fully meet the performance and price requirements of relatively cost-sensitive applications. The Cyclone device series and Altera's supporting products and solutions provide designers in the industry with a more competitive price level than ASICs.
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