Standardization of the serial interface specification for handset displays would permit the integration of the host function into the mobile handset CPU and the client function into the LCD display controller, thereby reducing the board space and cost requirements.
Unfortunately, efforts at industry standardization of the serial interface are split between two camps. The first standard to receive industry acceptance is the Mobile Display Digital Interface (MDDI) standard, endorsed by Qualcomm and ratified by the Video Electronics Standards Association (VESA). The second standard, developed by an industry consortium called the Mobile Industry Processor Interface (MIPI) Alliance, is the MIPI Alliance DSI standard, endorsed by many mobile CPU providers with solutions based upon the GSM and WCDMA standards.
The existence of two industry standards for high speed serial display interfaces has forced handset manufacturers to manage inventory for various LCD modules dependent upon the specific serial interface standard supported by their CPU selection.
California Micro Devices Corp has addressed this issue by introducing a device that can tie a variety of host interfaces to client display devices using a single-chip solution. The CM5160 MDDI-to-MIPI interface conversion IC and serial interface bridge provides a solution to the display interface problem by allowing designers to "bridge" either MDDI or conventional CPU host interfaces to a serial display client based upon the MIPI standard. The device can also interface to existing GSM and WCDMA baseband CPUs and application processors via an industry standard CPU interface. This will provide handset manufacturers seeking an early introduction of MIPI-based handset designs with the additional flexibility of utilizing widely available GSM and WCDMA CPUs that do not feature an integrated MIPI host.
by Gary Betz, California Micro Devices Corp
Full article:
http://techon.nikkeibp.co.jp/NEA/solutions/0903001.pdf
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