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PKTCFG1E_Addrs_cmp[2..1] = 11: In this configuration the packet is accepted if the received address matches
either the PKTCFG1D_Node_addrs[7..0] register, 0x00 or 0xFF. An interrupt can also be generated on IRQ0 if
the address comparison is successful. The 0x00 and 0xFF addresses are useful for sending two types of broad-
cast packets.
3.9.6 Cyclic Redundancy Check
CRC check is enabled by setting the PKTCFG1E_CRC_En[3] bit to 1. A 16-bit CRC checksum is calculated on
the payload part of the packet and is appended to the end of the transmitted message. The CRC checksum is
calculated on the received payload and compared to the transmitted CRC. The result of the comparison is stored
in the PKTCFG1E_CRC_stat[0] bit and an interrupt can also be generated on IRQ1. The CRC is based on the
CCITT polynomial as shown in Figure 16. The CRC also detects errors due to leading and trailing zeros.
Figure 16
3.9.7 Manchester Encoding
Manchester encoding is enabled by setting the PKTCFG1C_Man_en[7] bit to 1, and can only be used in Packet
data mode. Figure 17 illustrates Manchester encoding. NRZ data is converted to Manchester by encoding 1 bits
as 10 chip sequences, and 0 bits as 01 chip sequences. Manchester encoding guarantees DC-balance and fre-
quent data transitions in the encoded data. Note the maximum Manchester chip rate corresponds to the maximum
bit rate given in the specifications in Table 52.
Figure17
In transmit, Manchester encoding is applied only to the payload and CRC parts of the packet. The receiver de-
codes the payload and CRC before performing other packet processing tasks.
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