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CP3SP33SMS/NOPB Datasheet(PDF) 208 Page - Texas Instruments |
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CP3SP33SMS/NOPB Datasheet(HTML) 208 Page - Texas Instruments |
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208 / 407 page  Data Field Incorrect Bit r r r r DS047 r r CP3SP33 SNOSCW5 – MAY 2013 www.ti.com EFID The Error Field Identifier field identifies the frame field in which the last error occurred. The encoding of the frame fields is shown in Table 22-19. Table 22-19. Error Field Identifier EFID3:0 Field 0000 ERROR 0001 ERROR DEL 0010 ERROR ECHO 0011 BUS IDLE 0100 ACK 0101 EOF 0110 INTERMISSION 0111 SUSPEND TRANSMISSION 1000 SOF 1001 ARBITRATION 1010 IDE 1011 EXTENDED ARBITRATION 1100 R1/R0 1101 DLC 1110 DATA 1111 CRC EBID The Error Bit Identifier field reports the bit position of the incorrect bit within the erroneous frame field. The bit number starts with the value equal to the respective frame field length minus one at the beginning of each field and is decremented with each CAN bit. Figure 22-30 shows an example on how the EBID is calculated. Figure 22-30. EBID Example For example, assume the EFID field shows 1110b and the EBID field shows 111001b. This means the faulty field was the data field. To calculate the bit position of the error, the DLC of the message needs to be known. For example, for a DLC of 8 data bytes, the bit counter starts with the value: (8 × 8) – 1 = 63; so when EBID5:0 = 111001b = 57, then the bit number was 63 – 57 = 6. TXE The Transmit Error bit indicates whether the CAN module was an active transmitter at the time the error occurred. 0 – The CAN module was a receiver at the time the error occurred. 1 – The CAN module was an active transmitter at the time the error occurred. 208 Dual CAN Interfaces Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links :CP3SP33 |
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