lecture13 - ECE 412: Microcomputer Laboratory Lecture 13:...

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Lecture 13 1 Lecture 13: Other Devices on the XUP Board ECE 412: Microcomputer Laboratory
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Lecture 13 2 Objectives A whirlwind tour of the parts on the XUP board that we haven’t used or talked about yet.
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Lecture 13 3 Review Questions Why is the YUV format used by the video decoder more efficient than using an RGB format? The efficiency of YUV versus RGB lies in the fact that YUV is basically a compressed form of RGB. The encoding scheme takes advantage of the fact that the human eye is more sensitive to changes in brightness than changes in color. Therefore the YUV system gives more weight to the brightness (luminance) value of pixels. In RGB format, each pixel is required to have 3 bytes of information. In YUV format, only brightness data is sent for each individual pixel. The color data is only sent in 2 bytes for every-other pixel, and is shared between 2 neighboring pixels. Therefore, each set of 2 pixels features two brightness values (1 for each pixel) and 2 color values that are shared between the two, for a total of 4 bytes for 2 pixels. The same 2 pixels in RGB would take 6 bytes of space. This compression scheme allows YUV to be more efficient than RGB.
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Lecture 13 4 Parts We’ll Cover AC97 CODEC and stereo amp LXT972A Ethernet Transceiver DS2401 serial interface SN ROM Also on XUP board: Serial ATA ports (Advanced Technology Attachment: hard disk standard created to replace the parallel ATA) MGT transceivers Serial port USB 2.0 (used for programming at present) SystemAce (used for Linux file system) We have documentation on these for anyone interested in using them in a project.
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Lecture 13 5 XUP Development System Block Diagram
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Lecture 13 6 LM4550 codec The LM4550 was designed specifically to provide a high quality audio path and provide all analog functionality in a PC audio system. It features full duplex stereo ADCs and DACs and analog mixers with access to 4 stereo and 4 mono analog inputs. Each mixer input has separate gain, attenuation and mute control and the mixers drive 1 mono and 2 stereo analog outputs, each with attenuation and mute control. The LM4550 provides a stereo headphone amplifier as one of its stereo outputs and also supports National’s 3D Sound stereo enhancement and a comprehensive sample rate conversion capability.
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lecture13 - ECE 412: Microcomputer Laboratory Lecture 13:...

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