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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATPL230A датащи(PDF) 53 Page - ATMEL Corporation |
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ATPL230A датащи(HTML) 53 Page - ATMEL Corporation |
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53 / 122 page  53 ATPL230A [DATASHEET] Atmel-43053J-ATPL230A-Datasheet_22-Sep-16 9. PRIME PHY Layer 9.1 Overview The physical layer consists of a hardware implementation of the enhanced PRIME Physical Layer Entity, which is an Orthogonal Frequency Division Multiplexing (OFDM) system in the 42 kHz to 472 kHz frequency band. This PHY layer transmits and receives MPDUs (MAC Protocol Data Unit) between neighbor nodes. From the transmission point of view, the PHY layer receives its inputs from the MAC (Medium Access Control) layer. At the end of transmission branch, data is output to the physical channel. On the reception side, the PHY layer receives its inputs from the physical channel, and at the end of reception branch, the data flows to the MAC layer. A PHY layer block diagram is shown below: Figure 9-1. PHY Layer Block Diagram The diagram can be divided in five sub-blocks: TxRx buffers, Transmission branch, Reception branch, Analog Front End control and Carrier Detection. CRC CRC Interleaver FFT Scrambler Interleaver IFFT PRIME PHY Layer Tx Rx AGC(5:0) TXRX0 TXRX1 Convolutional Encoder Sub-carrier Modulator Cyclic Prefix Converter / PAD Analog Front - End Control Gain Control TxRx Control Pre - FFT Syncro Demodulator Convolutional Decoder to MAC layer from MAC layer Converter BUF_TXi BUF_RXi Sub-carrier Scrambler Carrier Detection |
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