DS90UB964-Q1 Datasheet, PDF (34/116 Pages) Texas Instruments – DS90UB964-Q1 Quad FPD-Link III Deserializer Hub

DS90UB964-Q1
SNLS500 – JULY 2016
www.ti.com
Status is provided to indicate when the forwarding engine is synchronized. In addition, a flag is used to indicate
that synchronization has been lost (status is cleared on a read).
Three options are available for Synchronized forwarding:
• Basic Synchronized forwarding
• Line-Interleave forwarding
• Line-Concatenated forwarding
Synchronized forwarding modes are selected by setting the CSIx_SYNC_FWD controls in the FWD_CTL2
register. To enable synchronized forwarding the following order of operations is recommended:
1. Disable Best-effort forwarding by clearing the CSIx_RR_FWD bits in the FWD_CTL2 register
2. Enable forwarding per Receive port by clearing the FWD_PORTx_DIS bits in the FWD_CTL1 register
3. Enable Synchronized forwarding in the FWD_CTL2 register
8.4.19.3 Basic Synchronized Forwarding
During Basic Synchronized Forwarding each forwarded frame is an independent CSI-2 video frame including
FrameStart (FS), video lines, and FrameEnd (FE) packets. Each forwarded stream may have a unique VC ID. If
the forwarded streams do not have a unique VC-ID, the receiving process may use the frame order to
differentiate the video stream packets.
The forwarding engine attempts to send the video synchronized. If synchronization fails, the CSI-2 transmitter
stops forwarding packets and attempts to restart sending synchronized video at the next FS indication. Packets
are discarded as long as the forwarding engine is unable to send the synchronized video.
Example Synchronized traffic to CSI-2 Transmit port at start of frame:
FS0 – FS1 – FS2 – FS3 – C0L1 – C1L1 – C2L1 – C3L1 – C0L2 – C1L2 – C2L2 – C3L2 – C0L3 …
Example Synchronized traffic to CSI-2 Transmit port at end of frame:
... C0LN – C1LN – C2LN – C3LN – FE0 – FE1 – FE2 – FE3
Notes:
FSx
FrameStart for Camera X
FEx
FrameEnd for Camera X
CxLy
Line Y for Camera X video frame
CxLN
Last line for Camera X video frame
Each packet includes the virtual channel ID assigned to receive port for each camera.
8.4.19.3.1 Code Example for Basic Synchronized Forwarding
# "*** RX0 VC=0 ***"
WriteI2C(0x4C,0x01) # RX0
WriteI2C(0x70,0x1F) # RAW10_datatype_yuv422b10_VC0
# "*** RX1 VC=1 ***"
WriteI2C(0x4C,0x12) # RX1
WriteI2C(0x70,0x5F) # RAW10_datatype_yuv422b10_VC1
# "*** RX2 VC=2 ***"
WriteI2C(0x4C,0x24) # RX2
WriteI2C(0x70,0x9F) # RAW10_datatype_yuv422b10_VC2
# "*** RX3 VC=3 ***"
WriteI2C(0x4C,0x38) # RX3
WriteI2C(0x70,0xDF) # RAW10_datatype_yuv422b10_VC3
# "CSI_PORT_SEL"
WriteI2C(0x32,0x01) # CSI0 select
# "CSI_EN"
WriteI2C(0x33,0x1) # CSI_EN & CSI0 4L
# "***Basic_FWD"
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