DS90UB964-Q1 Datasheet, PDF (27/116 Pages) Texas Instruments – DS90UB964-Q1 Quad FPD-Link III Deserializer Hub

www.ti.com
transported by the CSI-2 protocol.
Data Identifier (DI) Byte
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0
VC
DT
DS90UB964-Q1
SNLS500 – JULY 2016
Virtual Channel
Indentifier
(VC)
Data Type
(DT)
Figure 21. CSI-2 Data Identifier Structure
8.4.13 Virtual Channel and Context
The CSI-2 protocol layer transports virtual channels. The purpose of virtual channels is to separate different data
flows interleaved in the same data stream. Each virtual channel is identified by a unique channel identification
number in the packet header. Therefore, a CSI-2 TX context can be associated with a virtual channel and a data
type. Virtual channels are defined by a 2-bit field. This channel identification number is encoded in the 2-bit code.
The CSI-2 TX transmits the channel identifier number and multiplexes the interleaved data streams. The CSI-2
TX supports up to four concurrent virtual channels.
8.4.14 CSI-2 Mode Virtual Channel Mapping
The CSI-2 Mode provides per-port Virtual Channel ID mapping. For each FPD-Link III input port, separate
mapping may be done for each input VC-ID to any of the four VC-ID values. The mapping is controlled by the
VC_ID_MAP register. This function sends the output as a time-multiplexed CSI-2 stream, where the video
sources are differentiated by the virtual channel.
8.4.14.1 Example 1
The DS90UB964-Q1 is receiving data from cameras attached to each port. Each port is sending a video stream
using VC-ID of 0. The DS90UB964-Q1 can be configured to re-map the incoming VC-IDs to ensure each video
stream has a unique ID. The direct implementation would map incoming VC-ID of 0 for RX Port 0, VC-ID of 1 for
RX Port 1, VC-ID of 2 for RX Port 2, and VC-ID of 3 for RX Port 3.
Camera 0
VC-ID = 0
Camera 1
VC-ID = 0
Camera 2
VC-ID = 0
Camera 3
VC-ID = 0
HUB Deserializer
FPD3 RX
RIN0
VC-ID = 0
FPD3 RX
RIN1
FPD3 RX
RIN2
FPD3 RX
RIN3
VC-ID = 1
VC-ID = 2
VC-ID = 3
CSI TX 0
Figure 22. VC-ID Mapping Example 1
Copyright © 2016, Texas Instruments Incorporated
Product Folder Links: DS90UB964-Q1
Submit Documentation Feedback
27