Examples of communication interfaces

1 Examples ofcommunication interfacesTranditional interfaces No intelligence in the interface Only physical connectionOnly physical connectionThis could include changes in voltage levels and transformation from ballanced to unballanced signal We define the communication protocol in ourapplication programWe might use preprogrammed modules for this We have full control of the channel and can usethe interface for our own communication protocolsif we like2 Modern interfaces A high level of intelligence in the interface The communication protocol is defined in theinterface Much of the control of the communicationchannel is left to the interface and we haveto follow the rules of the communicationstandard to be able to communicateHere we will focus on the older type of interfaces3 Parallel linkUnit 1 Unit 2 Serial linkUnit 1 Unit 24 Skew in parallel linkRisk of missreadingUnbalanced linkOne signal lineTransmitterReciverGround5 Balanced linkPiti liTransmitterReciverPositive lineNegative lineNo ground besides maybe shieldingDisturbance on a unbalanced linkThe level refered to ground changesCould give missread signal6 Disturbance on a balanced linkBoth levels change in the same way so t

Memory interface cont. External 8K static RAM, 6264 13Addresslines13 Address lines→ 8K addresses8K addresses 8 Data lines → byte oriented Output enable /OE active low Open for reading Write enable /WE active low Open for writing Two chip select signals CS1 and CS2 Activate chip Memory interface cont. Two phases Address phase Data phase

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