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ATPL00B Datasheet(PDF) 92 Page - ATMEL Corporation |
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ATPL00B Datasheet(HTML) 92 Page - ATMEL Corporation |
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92 / 152 page  Atmel ATPL00B [datasheet] 43028A-ATPL - 9/12 92 10. Media Access Layer In power line communication (PLC) systems, medium access control (MAC) tasks require a high percent of the CPU available computational time. To reduce the computational load of the integrated MCU (8051C3A Core) the ATPL00B accelerates the execution of critical tasks by means of additional specific hardware units such as ADD1210 hardwired MAC unit MAC functional capabilities involve the construction of message packets and the management of correction and error detection mechanisms. The ATPL00B MAC is compatible with EHS and KONNEX. Moreover, its design is very versatile and allows the construction of a wide range of datagram structures with the only constrain of hardware correction and detection codes. 10.1 Packet Encapsulation Depending on enabled error correction and detection mechanisms, MAC can encapsulate packets following different configurations: Figure 10-1. Packet Encapsulation diagram A standard packet encapsulation has the following structure Figure 10-2. Datagram structure 2 byte 2 byte variable 2 bit PREAMBLE HEADER PAYLOAD POSTAMBLE Preamble: two bytes long, containing 0xAAAA for bit synchronization. The preamble size is configurable by a field in CTRL register 10.3.1 Header: two bytes long. It defines the type of datagram. ATPL00B supports FEC (Forward Error Correction) shielded and unshielded headers. In shielded headers, each byte of the header field is protected by a FEC field as shown below: Unshielded header: 8-bit 8-bit Header MSB Header LSB Shielded header: 8-bit 6-bit 8-bit 6-bit Header MSB FEC Header LSB FEC PREAMBLE HEADER PAYLOAD POST DATA1 DATA2 DATAN FCSh FCSi DATA1 FEC1 DATAN FECN FCSh FECh FCSi FCSi VITERBI (DATA 1, DATA 2, … DATA N, FCSh, FCSi) HEADER H HEADER L HEADER H HEADER L FEC FEC 2 Bytes 2 bits 6 bits 8bits 2 Bytes 8bits 8bits 8bits 6 bits 8bits 8bits 8bits 8bits 8bits 8bits 8bits 8bits 8bits 6 bits 6 bits 6 bits 6 bits variable 16 x (N + 2) bits |
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