RGB Image Data：
Table 32 defines the data type codes for the RGB data format described in this section.
RGB888：
RGB888 data transmission is accomplished by transmitting a BGR byte sequence. This sequence is shown in Figure 116:
The RGB888 frame format is shown in Figure 118:
Table 33 specifies the size constraints for RGB888 packets. The length of each packet must be a multiple of the values in the table:
The bit order during transmission follows the common CSI-2 rules, with the least significant bit (LSB) first. The mapping from pixels to bytes is shown in Figure 117:
RGB666:
RGB666 data transmission is accomplished by transmitting a sequence of B0…5, G0…5, and R0…5 (18 bits). This sequence is shown in Figure 119:
The frame format for RGB666 is shown in Figure 121:
Table 34 specifies the size constraints for RGB666 packets. The length of each packet must be a multiple of the values in the table:
The bit order during transmission follows the common CSI-2 rules, with the least significant bit (LSB) first. In the case of RGB666, the length of a data word is 18 bits instead of 8 bits. Word-level flipping is performed on 18-bit BGR words; that is, rather than flipping each 8-bit byte, the flipping is done for each 18-bit pixel value. This is shown in Figure 120:
RGB565:
RGB565 data transmission is accomplished by transmitting a 16-bit sequence of B0…B4, G0…G5, and R0…R4. This sequence is shown in Figure 122:
The frame format for RGB565 is shown in Figure 124:
Table 35 specifies the size constraints for RGB565 packets. The length of each packet must be a multiple of the values in the table:
The bit order during transmission follows the common CSI-2 rules, with the least significant bit (LSB) first. In the case of RGB565, the length of a data word is 16 bits instead of 8 bits. Word-level flipping is performed on 16-bit BGR words; that is, rather than flipping each 8-bit byte, the flipping is done for each two bytes (16 bits). This is shown in Figure 123:
RGB555:
RGB555 data can be transmitted over the CSI-2 bus, but requires special handling. RGB555 data should be treated similarly to RGB565 data. This can be accomplished by inserting padding bits into the least significant bit (LSB) of the green component, as shown in Figure 125; the format and packet size constraints are the same as for RGB565. The bit order during transmission follows the common CSI-2 rules, with the least significant bit (LSB) first. In the case of RGB555, the length of a data word is 16 bits instead of 8 bits. Word-level flipping is performed on 16-bit BGR words; that is, rather than flipping each 8-bit byte, the flipping is done for each two bytes (16 bits). This is shown in Figure 125:
RGB444:
RGB444 data can be transmitted over the CSI-2 bus, but requires special handling. RGB444 data should be treated similarly to RGB565 data. This can be accomplished by inserting padding bits into the least significant bit (LSB) of each color component, as shown in Figure 126. The frame format and packet size constraints are the same as for RGB565. The bit order during transmission follows the common CSI-2 rules, with the least significant bit (LSB) first. In the case of RGB444, the length of a data word is 16 bits instead of 8 bits. Word-level flipping is performed on 16-bit:
RAW6:
6-bit RAW data transmission is accomplished by transmitting pixel data to the CSI-2 bus. Each row is separated by start/end sync codes. This sequence is shown in Figure 127 (VGA case):
Table 37 specifies the size constraints for RAW6 packets. The length of each packet must be a multiple of the values in the table.
Each 6-bit pixel is sent with the least significant bit (LSB) first. This is an exception to the common CSI-2 rule of sending the least significant bit first by byte:
RAW7:
7-bit RAW data transmission is accomplished by transmitting pixel data to the CSI-2 bus. Each row is separated by start/end sync codes. This sequence is shown in Figure 130 (VGA case):
Table 38 specifies the size constraints for RAW7 packets. The length of each packet must be a multiple of the values in the table:
Each 7-bit pixel is sent with the least significant bit (LSB) first. This is an exception to the common CSI-2 rule of sending the least significant bit first by byte:
RAW8:
8-bit RAW data transmission is accomplished by transmitting pixel data to the CSI-2 bus. Table 39 specifies the size constraints for RAW8 packets. The length of each packet must be a multiple of the values in the table:
This sequence is shown in Figure 133 (VGA case). The bit order during transmission follows the common CSI-2 rules, with the least significant bit (LSB) first:
RAW10:
10-bit RAW data transmission is accomplished by packing 10-bit pixel data into a format similar to 8-bit data. Table 40 specifies the size constraints for RAW10 packets. The length of each packet must be a multiple of the values in the table:
This sequence is shown in Figure 136 (VGA case). The bit order during transmission follows the common CSI-2 rules: least significant bit (LSB) first:
RAW12:
12-bit RAW data transmission is accomplished by packing 12-bit pixel data into a format similar to 8-bit data. Table 41 specifies the size constraints for RAW12 packets. The length of each packet must be a multiple of the values in the table:
This sequence is shown in Figure 139 (VGA case). The bit order during transmission follows the common CSI-2 rules: least significant bit (LSB) first:
RAW20:
20-bit RAW data transmission is accomplished by packing 20-bit pixel data into a format similar to 10-bit data. Table 44 specifies the size constraints for RAW20 packets. The length of each packet must be a multiple of the values in the table:
This sequence is shown in Figure 148 (VGA case). The bit order during transmission follows the common CSI-2 rules: least significant bit (LSB) first:
User Defined Data Formats:
User-defined data type values are used for transmitting arbitrary data over the CSI-2 bus, such as JPEG and MPEG4 data. The data should be packed so that the data length is a multiple of 8 bits. If padding is needed, it should be done before the data is passed to the CSI-2 protocol interface. The bit order during transmission follows the common CSI-2 rules, with the least significant bit (LSB) first:
The size of the data packets (in bits) must be divisible by 8, meaning that whole bytes of data must be transmitted.
For user-defined data:
● Frames are transmitted as a sequence of data packets of arbitrary size.
● The size of the packets can vary between different packets.
● The intervals between packets can also vary.
As shown in Table 45, there are eight different user-defined data type codes available:
