NFC Digital Protocol - CWI

NFC-B Technology5.2 Bit Level Coding5.2.1 Poll→Listen Coding SchemeThe patterns L and H are used to code the digital alphabet Logic “0” and Logic “1”.Requirements 41: Bit Level Coding Poll→Listen – NFC-BPoll Mode5.2.1.1 The NFC Forum Device MUSTcode Logic “0” and Logic “1” asfollows:• Logic “0”: pattern L• Logic “1”: pattern HListen Mode5.2.1.2 The NFC Forum Device MUSTdecode Logic “0” and Logic “1” asfollows:• If the NFC Forum Devicedetects pattern L, then it MUSTdecode this as Logic “0”.• If the NFC Forum Devicedetects pattern H, then itMUST decode this as Logic“1”.Invalid patterns MAY be treated asTransmission Errors, or the device MAY useimplementation dependent methods to decodean invalid pattern into a Logic “0” or Logic“1”.5.2.2 Listen→Poll Coding SchemeUse patterns N and M to code the digital alphabet Logic “0” and Logic “1”.Requirements 42: Bit Level Coding Listen→Poll – NFC-BPoll Mode5.2.2.1 The NFC Forum Device MUSTdecode Logic “0” and Logic “1” asfollows:• If the NFC Forum Devicedetects pattern N, then it MUSTdecode this as Logic “0”.• If the NFC Forum Devicedetects pattern M, then itMUST decode this as Logic“1”.Invalid patterns MAY be treated asTransmission Errors or the device MAY useimplementation dependent methods to decodean invalid pattern into a Logic “0” orLogic “1”.Listen Mode5.2.2.2 The NFC Forum Device MUSTcode Logic “0” and Logic “1” asfollows:• Logic “0”: pattern N• Logic “1”: pattern MNFC Digital Protocol Page 50