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MRF24J40-I/T 데이터시트(PDF) 6 Page - Microchip Technology |
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MRF24J40-I/T 데이터시트(HTML) 6 Page - Microchip Technology |
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6 / 156 page ![]() MRF24J40 DS39776C-page 6 Preliminary © 2010 Microchip Technology Inc. 1.1 IEEE 802.15.4-2003 Standard The MRF24J40 is compliant with the IEEE 802.15.4™-2003 Standard. The Standard speci- fies the physical (PHY) and Media Access Controller (MAC) functions that form the basis for a wireless net- work device. Figure 1-2 shows the structure of the PHY packet and MAC frame. It is highly recommended that the design engineer be familiar with the IEEE 802.15.4-2003 Standard in order to best understand the configuration and operation of the MRF24J40. The Standard can be downloaded from the IEEE web site: http://www.ieee.org. FIGURE 1-2: IEEE 802.15.4™ PHY PACKET AND MAC FRAME STRUCTURE Preamble SFD 41 Frame Length SHR PHR 1 PHY Layer 2 1 4 or 10 Superframe Specification 2 GTS Fields k Pending Address Fields m Beacon Payload n MSDU MFR MAC Sublayer Beacon Frame 2 1 4 to 20 Data Payload n MSDU MAC Sublayer Data Frame 2 1 4 to 20 Command Payload n MSDU MAC Sublayer MAC Command Frame Command Type 1 PHY Payload PSDU MHR MHR MHR Frame Control Adressing Fields Frame Control Adressing Fields Frame Control Adressing Fields Sequence Number Sequence Number Sequence Number PPDU octets 5 – 127 FCS 2 MFR FCS 2 MFR FCS 2 octets octets octets 2 1 MAC Sublayer Acknowledgment Frame MHR Frame Control Sequence Number MFR FCS 2 octets On air packet |
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