データシートサーチシステム |
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SI3483 データシート(PDF) 10 Page - Silicon Laboratories |
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SI3483 データシート(HTML) 10 Page - Silicon Laboratories |
10 / 52 page Si3483 10 Confidential Rev. 1.1 3.1. Packet Format A packet is a sequence of fields sent together as a unit. Figure 7 shows the SPP packet format. Figure 7. Packet Format Each field is a single byte except for the Data field. The Data field length may be from zero to 255 bytes. 3.1.1. Start Field The Start field marks the beginning of a packet and always contains the Start-of-Packet (SOP) character (0xAC). If data is lost on the host interface, the Serial Packet Server and the Serial Packet Client use the Start field to resynchronize. A “receive packet” routine starts by receiving and discarding bytes until the SOP character is found. 3.1.2. Checksum Field The Checksum field is used to verify that the packet was not corrupted during transmission. The sender of a packet calculates the checksum and writes it into the Checksum field. The receiver of a packet verifies that the checksum is correct. The Checksum field should contain the value such that all the bytes in the packet, except for the Start field, add up to zero. Figure 8. Packet Checksum To calculate the checksum, the sender uses an 8-bit variable to sum up the bytes of the Routine field through the end of the Data field. The sender adds one to the one's complement of this sum and stores the result in the Checksum field. To verify the checksum, the receiver uses an 8-bit variable to sum up the bytes of the Routine field through the Checksum field. The sum should be zero. 3.1.3. Routine Field The Routine field identifies a routine in the Power Manager API. The client uses the Routine field to specify which routine to call. The client should verify that the Routine field in a received packet matches the Routine field in the sent packet. Definitions of routines can be found in “4. Power Manager API” . 3.1.4. Data Length Field The DataLength field specifies the number of bytes in the Data field. The number of bytes may be from zero to 255. 3.1.5. Data Field The Data field is used to pass data to and from the Si3483. The Data field may contain four different types of data: Parameters System Information Port Information Events The Data field has a different format for each type of data. The format of commands issued by the host to the power manager is fixed, but the format of the returned values may be of four different types: Parameters, System Information, Port Information, and Events. To elaborate, in all packets issued by the host, the Data Field has the Parameters format. Most of the returned packet are also in the Parameters format, the only exceptions being the packets that are received back after calling Start Routine Data Length Data Checksum Start Routine Data Length Data Checksum Sum of Bytes is Zero Checksum ~Sum 1 + = |
同様の部品番号 - SI3483 |
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同様の説明 - SI3483 |
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