DS90UB964-Q1 Datasheet, PDF (26/116 Pages) Texas Instruments – DS90UB964-Q1 Quad FPD-Link III Deserializer Hub

DS90UB964-Q1
SNLS500 – JULY 2016
www.ti.com
32-bit SHORT PACKET (SH)
Data Type (DT) = 0x00 ± 0x0F
Figure 19. CSI-2 Short Packet Structure
8.4.11 CSI-2 Long Packet
A long packet consists of three elements: a 32-bit packet header (PH), an application-specific data payload with
a variable number of 8-bit data words, and a 16-bit packet footer (PF). The packet header is further composed of
three elements: an 8-bit data identifier, a 16-bit word count field, and an 8-bit ECC. The packet footer has one
element, a 16-bit checksum. Figure 20 shows the structure of a long packet.
32-bit
PACKET
HEADER
(PH)
PACKET DATA:
Length = Word Count (WC) * Data Word
Width (8-bits). There are NO restrictions
on the values of the data words
Figure 20. CSI-2 Long Packet Structure
16-bit
PACKET
FOOTER
(PF)
PACKET
PART
Header
Data
Footer
Table 8. CSI-2 Long Packet Structure Description
FIELD NAME
VC / Data ID
Word Count
ECC
Data
Checksum
SIZE (BIT)
8
16
8
WC * 8
16
DESCRIPTION
Contains the virtual channel identifier and the data-type information.
Number of data words in the packet data. A word is 8 bits.
ECC for data ID and WC field. Allows 1-bit error recovery and 2-bit
error detection.
Application-specific payload (WC words of 8 bits).
16-bit cyclic redundancy check (CRC) for packet data.
8.4.12 CSI-2 Data Identifier
The DS90UB964-Q1 MIPI CSI-2 protocol interface transmits the data identifier byte containing the values for the
virtual channel ID (VC) and data type (DT) for the application specific payload data, as shown in Figure 21. The
virtual channel ID is contained in the 2 MSBs of the data identifier byte and identify the data as directed to one of
four virtual channels. The value of the data type is contained in the 6 LSBs of the data identifier byte.
For each RX Port, register defines with which channel and data type the context is associated:
• 0x70 RAW10 Mode and 0x71 RAW12 Mode
• RAW1x_VC[7:6] field defines the associated virtual ID transported by the CSI-2 protocol from the camera
sensor.
• RAW1x_ID[5:0] field defines the associated data type. The data type is a combination of the data type
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