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发表于 2009-1-16 21:21:51
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Introduction
The introduction of multimedia services in 3G phones is driving the increase in resolution of
graphic displays and cameras. The interface between displays and camera modules to the
baseband circuit or multimedia processor through the flex cable involves tough cabling
constraints and EMI becomes a key concern.
To address these issues, several display manufacturers, semiconductor and camera module
maker companies have developed high speed serial bus technology to liberate phone
designers from crowded and noisy parallel interface designs.
Contents
1 The EMI constraints in clamshell phones . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Pixel format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Display and camera resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Required bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Solutions to EMI constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.1 Larger bus width with higher number of data lines, and increased bus
frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.2 Serial bus implementation with high data clock frequency. . . . . . . . . . . . 6
1.5 The benefits of the serial bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 The need for protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 STMicroelectronics solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 |
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