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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UM0934 датащи(PDF) 25 Page - STMicroelectronics |
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UM0934 датащи(HTML) 25 Page - STMicroelectronics |
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25 / 113 page  UM0934 MAC layer Doc ID 17389 Rev 2 25/113 Figure 9. MAC synchronization services 4.4 Framing The framing process performed by the MAC layer is depicted in Figure 11. Upper layers (running in the external host) request a transmission through the primitive M_Data.Request(), passing to the MAC the service data unit M_sdu to be transmitted and additional information regarding addresses and repetition credits. Such information is used by the MAC to build the “long MAC frame” made up of the following fields: ● Header: – NS: number of subframes building the long frame – SA: source address (12-bit) – DA: destination address (12-bit) – Repetition credits (information used for repetition management, 8 bits) ● M_sdu (from 1 up to 242 bytes) ● FCS (24 bit CRC). The “long MAC frame” is then divided into several 38-byte fixed-length protocol data units (M_pdu) called “MAC subframes”, the structure is depicted in Figure 10. The frame indicator (FI) is always equal to 0000h to mark it as a subframe of a long MAC frame. Power Line time-slot synchronization change (found or loss) time-slot synchronization reject P_Sync.request P_Sync.indication PHY Layer MAC Layer Local Node M_Sync.request M_Sync.indication Upper Layers (ext. Host) |
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