Other Wired Protocols
The world is moving to high speed serial protocols.
They have fewer wires than parallel interfaces making them cheaper to produce. They use differential signalling which reduces noise, and reduces the voltage swings which reduces power consumption.
Network Device Interface. View
Network Device Interface (NDI) is a royalty free protocol for transmitting video over IP.
Serial digital interface . View
Serial digital interface (SDI) is a family of digital video interfaces first standardized by SMPTE (The Society of Motion Picture and Television Engineers) in 1989
Even though it was months, since I wrote the original article which this web site is based on, here is yet another protocol. That is why this website is needed, because people just do not know the options.
Coax Express. View
Coax Express is an upgraded version of Camera Link, supporting higher bandwidth over coaxial cables.
You can visit their website, with about 50 suppliers listed. The spec is available for free. This is again a very complex protocol, as low frequency camera control is transmitted over the same wire as the high frequency image.
Gigabit Multimedia Serial Link. View
Gigabit Multimedia Serial Link (GMSL) is a SerDes version by Maxim Corporation.
GMSL Their products allow the I2C control to be on a separate side channel from the high bandwidth video.
ASA MotionLink . View
ASA MotionLink is a SerDes version which was created by the Automobile Serdes Alliance (ASA).
ASA is an industry group whose goal is to “provide standards for asymmetric high speed P2P communication in vehicles.”
Mipi A-Phy. View
MIPI A-Phy is a merger between the proprietary MIPI C-Phy and the more open ASA MotionLink.
MIPI C-Phy was created by the MIPI alliance for automotive and other applications which need longer distance communication.
Many vendors hope that MIPI A-Phy will be the winner for longer cable lengths. But like all things created by large committees with compromises, it is a bit complex.
V3Link. View
V3Link aggregates data from multiple industry protocols.
As an industrial variant of FPD-Link III, V3Link is a multi-protocol physical layer technology that aggregates data from different industry standard protocols and transfers it over coaxial or twisted pair cables. It acts as a bridge between protocol-based data interfaces that transfer high bandwidth data over short distances, and in cases where the source interface does not match the sync interface, it can also work as a data converter.
Automotive Applications. View
In the automotive and trucking industries there is a need for long cables connecting high bandwidth cameras and Lidar to displays.
To minimize cost they want to use just two wires, either a coaxial cable, a twisted pair or a shielded twisted pair. They want an asymmetric standard; high bandwidth video goes in one direction, low bandwidth control signals go in the other direction, sometimes control goes in both directions. They also want the option to send power over the same two wire cable. One problem is that high frequency signals attenuate very rapidly. Doing all of this on a single pair of wires is a miracle of mixed signal engineering. Here are the available solutions to this problem.
SerDes. View
Serializer/Deserializer (SerDes) converts between parallel and serial data.
SerDes uses differential pairs. On FPGAs, SerDes typically operates from 1,25 to 5 GHz. Serdes may be exposed on the external pins, or it may be used as part of a more complex protocol such as USB or MIPI. GateMate and the Lattice NX33 are low cost FPGAs with exposed SerDes.
JESD204. View
A new proprietary standard from AMD.
It is used for a range of high-speed ADC applications, including wireless infrastructure (GSM, EDGE, W-CDMA, LTE, CDMA2000, WiMAX, TD-SCDMA) transceiver architectures, software-defined radios, portable instrumentation, medical ultrasound equipment, and Mil/Aero applications such as radar and secure communications.
PCIe. View
Wikipedia: "PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe, is a high-speed standard used to connect hardware components inside computers."
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