CP3SP33SMSSLASHNOPB datasheet(171/407 Pages) TI1

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STANDARD DATA FRAME (number of bits = 44 + 8N)

Control Field

Data Field

END OF

FRAME

CRC Field

CRC

Arbitration Field

IDENTIFIER

10 ... 0

DATA

LENGTH CODE

d d d

r r

Bit Stuffing

1 5

8N (0 < N < 8)

Note:

d = dominant

r = recessive

DS020

CP3SP33

www.ti.com

SNOSCW5 – MAY 2013

22.2.2.4 Data Length Code (DLC)

The DLC field indicates the number of bytes in the data field. It consists of four bits. The data field can be

of length zero. The admissible number of data bytes for a data frame ranges from 0 to 8.

22.2.2.5 Data Field

The Data field consists of the data to be transferred within a data frame. It can contain 0 to 8 bytes. A

remote frame has no data field.

22.2.2.6 Cyclic Redundancy Check (CRC)

The CRC field consists of the CRC sequence followed by the CRC delimiter. The CRC sequence is

derived by the transmitter from the modulo 2 division of the preceding bit fields, starting with the SOF up

to the end of the data field, excluding stuff-bits, by the generator polynomial:

x15 + x14 + x10 + x8 + x7 + x4 + x3 + 1

The remainder of this division is the CRC sequence transmitted over the bus. On the receiver side, the

module divides all bit fields up to the CRC delimiter excluding stuff bits, and checks if the result is zero.

This will then be interpreted as a valid CRC. After the CRC sequence a single “recessive” bit is

transmitted as the CRC delimiter.

22.2.2.7 ACK Field

The ACK field is two bits long and contains the ACK slot and the ACK delimiter. The ACK slot is filled with

a “recessive” bit by the transmitter. This bit is overwritten with a “dominant” bit by every receiver that has

received a correct CRC sequence. The second bit of the ACK field is a “recessive” bit called the

acknowledge delimiter.

The End of Frame field closes a data and a remote frame. It consists of seven “recessive” bits.

22.2.3 CAN Frame Formats

22.2.3.1 Data Frame

The structure of a standard data frame is shown in Figure 22-3. The structure of an extended data frame

is shown in Figure 22-4.

Figure 22-3. Standard Data Frame

Dual CAN Interfaces

171

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