M-PHY is a high speed data communications physical layer protocol standard developed by the MIPI Alliance, PHY Working group, and targeted at the needs of mobile multimedia devices.[1] The specification's details are proprietary to MIPI member organizations, but a substantial body of knowledge can be assembled from open sources. A number of industry standard settings bodies have incorporated M-PHY into their specifications including Mobile PCI Express,[2][3][4][5][6][7][8] Universal Flash Storage,[9][10][11] and as the physical layer for SuperSpeed InterChip USB.[12][13][14][15][16][17]
| MIPI M-PHY | |
| Year created | 2011 |
|---|---|
| Created by | MIPI Alliance |
| Supersedes | D-PHY |
| Width in bits | 1–4 lanes, w/adaptive discovery (depending on higher-level protocol) |
| Speed | up to 11.6 Gbit/s per data lane |
| Style | serial, embedded clock |
| External interface | yes, with optical media converter |
| Website | https://mipi.org/specifications/m-phy |
To support high speed, M-PHY is generally transmitted using differential signaling over impedance controlled traces between components. When use on a single circuit card, the use of electrical termination may be optional. Options to extend its range could include operation over a short flexible flat cable, and M-PHY was designed to support optical media converters allowing extended distance between transmitters and receivers, and reducing concerns with electromagnetic interference.[15]
Applications
editM-PHY (like its predecessor[dubious – discuss] D-PHY) is intended to be used in high-speed point-to-point communications, for example video Camera Serial Interfaces. The CSI-2 interface was based on D-PHY (or C-PHY), while the newer CSI-3 interface is based on M-PHY. M-PHY was designed to supplant D-PHY in many applications, but this is expected to take a number of years.
The M-PHY the physical layer is also used in a number of different high-speed emergent industry standards, DigRF (High speed radio interface), MIPI LLI (Low latency memory interconnect for multi-processors systems), and one possible physical layer for the UniPro protocol stack.
Signaling speed and gears
editM-PHY supports a scalable variety of signaling speeds, ranging from 10 kbit/s to over 11.6 Gbit/s per lane. This is accomplished using two different major signaling/speed modes, a simple low-speed (using PWM) mode and high speed (using 8b10b).[18] Communications goes on in bursts, and the design of both high-speed and low-speed forms allows for extended periods of idle communications at low-power, making the design particularly suitable for mobile devices.
Within each signaling method, a number of standard speeds, known as "gears", is defined, with the expectation that additional gears will be defined in future versions of the standard.[19]
References
edit- ^ "MIPI M-PHY takes center stage". EDN. Retrieved 2018-04-22.
- ^ "M-PCIe – Goin' mobile!". EDN. Retrieved 2018-04-22.
- ^ "PCIe Follows USB 3.0 to Mobile Applications - PCI Express". eecatalog.com.
- ^ "PCI-SIG and MIPI Alliance Announce Mobile PCIe (M-PCIe) Specification - PCI Express". eecatalog.com.
- ^ "PCIe for Mobile Launched; PCIe 3.1, 4.0 Specs Revealed". 28 June 2013.
- ^ "Specifications" (PDF). pcisig.com.
- ^ "Moving PCI Express to Mobile (M-PCIe)". Design And Reuse.
- ^ "MindShare - Mobile PCI Express (M-PCIe) (Training)". www.mindshare.com.
- ^ "Universal Flash Storage (UFS) - JEDEC". www.jedec.org.
- ^ "Universal Flash Storage: Mobilize Your Data". Design And Reuse.
- ^ "UFS 3.0 standard released, offers 2x faster performance than UFS 2.1". www.fonearena.com.
- ^ "MIPI Alliance and USB 3.0 Promoter Group Announce Availability of SuperSpeed USB Inter-Chip". Edn.com. 2012-06-20. Retrieved 2018-04-22.
- ^ "MIPI M-Phy Testing Services". 29 May 2014.
- ^ "MIPI M-PHY". mipi.org.
- ^ a b "MIPI™ MPHY - An introduction". Design And Reuse.
- ^ "MIPI M-PHY takes center stage". Design And Reuse.
- ^ "Specifications". eecatalog.com.
- ^ MIPIAlliance (18 December 2012). "MIPI M-PHY Electrical Characterisation & Challenges by Parthasarathy Raju, Tektronix - part 1" – via YouTube.
- ^ MIPIAlliance (18 December 2012). "MIPI M-PHY Electrical Characterisation & Challenges by Parthasarathy Raju, Tektronix - part 1" – via YouTube.
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