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Type 4A Tag PlatformThe parameter k denotes the number of historical bytes.• Length byteThe length byte TL is mandatory and specifies the length of the transmitted ATS, includingthe TL byte itself.Requirements 130: Length Byte TL of the ATSPoll Mode11.6.2.2 The <strong>NFC</strong> Forum Device MUST beready to receive an ATS with TLspecifying a length less than orequal to 20 bytes.The <strong>NFC</strong> Forum Device MAY accept an ATSwith TL indicating a length greater than 20bytes.Listen Mode11.6.2.1 The first byte of the ATS (TL)MUST specify the length of theATS including TL itself.11.6.2.3 TL MUST not indicate a lengthgreater than 20 bytes.• Format Byte T0The format byte T0 is coded as specified in Table 65.Table 65: Coding of Format Byte T0b8 b7 b6 b5 b4 b3 b2 b1 Meaning0 RFUx TC(1) is transmitted, if bit is set to 1x TB(1) is transmitted, if bit is set to 1x TA(1) is transmitted, if bit is set to 1x x x x FSCIThe least significant nibble b4 to b1 is called FSCI (Frame Size for proximity Card Integer) andcodes the maximum frame size (FSC). The FSC defines the maximum size of a frame acceptedby the <strong>NFC</strong> Forum Device in Listen Mode. FSC is expressed in number of data bytes included inthe frame.<strong>NFC</strong> <strong>Digital</strong> <strong>Protocol</strong> Page 110
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