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MC13192 数据表(PDF) 5 Page - Freescale Semiconductor, Inc |
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MC13192 数据表(HTML) 5 Page - Freescale Semiconductor, Inc |
5 / 24 page Data Transfer Modes MC13192 Technical Data, Rev. 3.3 Freescale Semiconductor 5 4 Data Transfer Modes The MC13192 has two data transfer modes: 1. Packet Mode — Data is buffered in on-chip RAM 2. Streaming Mode — Data is processed word-by-word The Freescale 802.15.4 MAC software only supports the streaming mode of data transfer. For proprietary applications, packet mode can be used to conserve MCU resources. 4.1 Packet Structure Figure 3 shows the packet structure of the MC13192. Payloads of up to 125 bytes are supported. The MC13192 adds a four-byte preamble, a one-byte Start of Frame Delimiter (SFD), and a one-byte Frame Length Indicator (FLI) before the data. A two-byte Frame Check Sequence (FCS) is calculated and appended to the end of the data. Figure 3. MC13192 Packet Structure 4.2 Receive Path Description In the receive signal path, the RF input is converted to low IF In-phase and Quadrature (I & Q) signals through two down-conversion stages. A Clear Channel Assessment (CCA) can be performed based upon the baseband energy integrated over a specific time interval. The digital back end performs Differential Chip Detection (DCD), the correlator “de-spreads” the Direct Sequence Spread Spectrum (DSSS) Offset QPSK (O-QPSK) signal, determines the symbols and packets, and detects the data. The preamble, SFD, and FLI are parsed and used to detect the payload data and FCS which are stored in RAM. A two-byte FCS is calculated on the received data and compared to the FCS value appended to the transmitted data, which generates a Cyclical Redundancy Check (CRC) result. Link Quality is measured over a 64 µs period after the packet preamble and stored in RAM. If the MC13192 is in packet mode, the data is processed as an entire packet. The MCU is notified that an entire packet has been received via an interrupt. If the MC13192 is in streaming mode, the MCU is notified by an interrupt on a word-by-word basis. Figure 4 shows CCA reported power level versus input power. Note that CCA reported power saturates at about -57 dBm input power which is well above 802.15.4 Standard requirements. Preamble SFD FLI Payload Data FCS 4 bytes 1 byte 1 byte 125 bytes maximum 2 bytes |
类似零件编号 - MC13192_08 |
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类似说明 - MC13192_08 |
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