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<strong>NFC</strong>-A Technology4.9.2 SLP_REQ ResponseThe <strong>NFC</strong> Forum Device in Listen Mode does not respond to an SLP_REQ Command.Requirements 25: SLP_REQ ResponsePoll Mode4.9.2.1 The <strong>NFC</strong> Forum DeviceMUST always treat theSLP_REQ Command asacknowledged by the <strong>NFC</strong>Forum Device in ListenMode.Listen Mode4.9.2.2 The <strong>NFC</strong> Forum Device MUST notrespond to an SLP_REQ Command.4.10 Timing RequirementsThis section specifies the requirements for the different guard times and Frame Delay Times for<strong>NFC</strong>-A Technology.NOTEThe term “Frame Response Time” as used in [ISO/IEC_18092] is referred to as“Frame Delay Time” in this document.4.10.1 Frame Delay Time Poll→ListenThe Frame Delay Time Poll→Listen (FDT A,LISTEN ) is the time between a Poll Frame and a ListenFrame. The time between the minimum value FDT A,LISTEN,MIN and the maximum valueFDT A,LISTEN,MAX defines the time interval in which a Listen Frame is allowed to be sent by an<strong>NFC</strong> Forum Device in Listen Mode in response to a Poll Frame of an <strong>NFC</strong> Forum Device in PollMode.For <strong>NFC</strong>-A Technology, FDT A,LISTEN depends on the logic value of the last bit before the EoFtransmitted by the <strong>NFC</strong> Forum Device in Poll Mode, as illustrated in Figure 8.<strong>NFC</strong> <strong>Digital</strong> <strong>Protocol</strong> Page 37
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