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`used. The great advantage ofan inbuilt device for dynamically matched impedances is that
`when resistors are replaced with digitally dynamically controlled and matched impedance: in
`the devices. there are no line reflections and therefore no missing of bits or bus faults.
`5. An U0 device may consist of multiple gigabit (622 Mbps to 3.125 Gbps} transceiverts)
`{MGTs). Special support circuitry is needed for this rate. Rocker U0 T" serial 3.125 G-bps
`transreceivers are the examples of circuits that provide the support circuitry for this rate.
`6. A device for U0 tnay integrate a SerDes (serialization and Dc-serialization) subunit. SerDes is a
`standard subunit in a device where the bytes placed at ‘transmit holding buffer‘ serialize on
`transmission and once the bits are received these dc-serialize and are placed at the ‘receiver
`buffer‘. Once the device SerDes subunit is configured. serialization and dc-serialization is done
`automatically without the use of the processor-instructions. The great advantage of the SerDes
`unit is that these operations are fast when compared to operations without a SerDes. [A device
`for U0 may integrate a DAA or McBSP subunit when serializing. Refer Sections D.-1.4 and
`1.3.4.5.]
`7. Recently. multiple U0 standards have been developed for U0 devices. A support to the multiple
`IIO standards may be needed in certain embedded systems. A technology. Flexible Select U0
`7” -Ultra technology supports over 20 single ended and differential U0 signaling standards.
`Advantages of multiple standard support devices are obvious.
`3. An U0 device rrtay integrate a digital Physical Coding Sub layer (PCS). Analog audio and video
`signals can then be pulse code modulated (PCM) at the sub layer. The PCS sub layer directly
`provides the codes from the analog inputs within the device itself. The codes are then saved in
`the device data buffers. The advantage ol'an in-built PCS at a port device is that there is no need
`of external PCM coding. Besides. these operations are in the background as well as fast. It
`improves the system's performance for multimedia inputs at the devices.
`9. A device for U0 may integrate an analog Physical Media Attachment (FHA) unit for connecting
`direct inputs and outputs of voice. music. video and images. The great advantage of an in-built
`PMA is that the device directly connects to the physical media. PMA is needed for real-time
`processing of video and audio inputs at the device.
`
`41-ovvaday-5. U0 devices have sophisticated features. Eehmtct trigger inputs are used for noise
`
`eflnwuflm.DevheoMthbwvdtagcgatesaMdeHceauflrgpmvwmmagananbyp'wmfltg
`unnecessary toggling at: 1:!-Ieinputs are used for sophisticated applications. DyrIamtt.'.allyoon-
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`t:hetievIces.5et-Deeoubuniteertallzes andde-eeriattzesoutpuesartdlnpucelnthadevtcesh
`por't‘.maylutvePC5arteiPhtflsubunttsforaruloglnputsforvideoartdatidloflflderlceo.
`
`3.2 TIMER AND COUNTING DEVICES
`
`Can we tltlnlt oi even a simple system like a TV rentote controller or a washing machine
`without a timer device? No. Exactly same is the answer for embedded systems. A timer device is
`fairly complex. It has a number of states (Table 3.5).
`
`1
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`ASSA 1013
`
`1
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`ASSA 1013