Datasheet

1 B SOF Line1 EOL B
2 B SOL Line2 EOL B
3 B SOL Line3 EOL B
4 B SOL Line4 EOF B
5
6
7
8
9
10
1
B SOF Line1 EOL B
2 B SOL Line2 EOL B
3 B SOL Line3 EOL B
4 B SOL Line4 EOF B
5
6
7
8
9
10
1
B SOF Line1 EOL B
2 B SOL Line2 EOL B
3 B SOL Line3 EOL B
4 B SOL Line4 EOL B
5 B SOL Line5 EOL B
6 B SOL Line6 EOL B
7 B SOL Line7 EOL B
8 B SOL Line8 EOF B
9
B
B
B
B
B
B
B
B
B
B
B
B
B
1 B SOF Line1 EOL B
2 B SOL Line2 EOL B
3 B SOL Line3 EOL B
4 B SOL Line4 EOF B
5
6
7
8
9
10
1 B SOF Line1 EOL B
2 B SOL Line2 EOL B
3 B SOL Line3 EOL B
4 B SOL Line4 EOL B
5 B SOL Line5 EOL B
6 B SOL Line6 EOL B
7 B SOL Line7 EOL B
8 B SOL Line8 EOF B
9
10
1 B SOF Line1 EOL B
2 B SOL Line2 EOL B
3 B SOL Line3 EOL B
4 B SOL Line4 EOL B
5 B SOL Line5 EOL B
6 B SOL Line6 EOL B
7 B SOL Line7 EOL B
8 B SOL Line8 EOF B
9
B
B
B
B
B
B
B
B
B
visibleimagedata
Line 8 - Lastvisibleline
Frameblankingperiod
Line blanking period
Line 1 – firstvisibleline
NewFrame
visibleimagedata
Line 4 - Lastvisibleline
Frameblankingperiod
Line blanking period
Line 1 – firstvisibleline
OriginalFrame
[MODE=0]
VSandHSedgealigned;
(idealresponse)
[MODE=1]
1 B SOF Line1 EOL
2 B SOL Line2 EOL
3 B SOL Line3 EOL
4 B SOL Line4 EOL EOF
5
6
7
8
9
10
1
B SOF Line1 EOL
2 B SOL Line2 EOL
3 B SOL Line3 EOL
4 B SOL Line6 EOL
5 B SOL Line5 EOL
6 B SOL Line6 EOL
7 B SOL Line6 EOL
8 B SOL Line7 EOL EOF
9
10
1
B SOF Line1 EOL
2 B SOL Line2 EOL
3 B SOL Line3 EOL
4 B SOL Line4 EOL
5 B SOL Line5 EOL
6 B SOL Line6 EOL
7 B SOL Line7 EOL
8 B SOL Line8 EOL EOF
9
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
[MODE=0]
VSlagsbehindHSby
>1/f
DCLK
cycle
P480 B B
CLK
D[0:7]
VS
HS
B B B B B
P476 P477 P478
OUT
(Serial)
P479 P480 EOF1 EOF2 EOF3 EOF4
B
B
MODE=HighandLine_Count=Frame_Count
MODE=1
CLK
D[0:7]
VS
HS
OUT
(Serial)
P480
B B B
B B B B
EOF1P476
P477 P478 P479
P480 EOL1 EOL2 EOL3 EOL4
MODE=0
B
SN65LVDS315
www.ti.com SLLS881F –DECEMBER 2007–REVISED SEPTEMBER 2012
Caution: Some camera sensors generate a frame
sync (VS) signal that lasts longer than the HS of the
last visible line. In such case, and with MODE=low,
the SN65LVDS315 transmits EOL during the last HS
low transition and transmits EOF when VS transitions
low. If the CSI-1 receiver can tolerate receiving EOL
followed by EOF, it is recommended to keep the
MODE input pin set to low.
If the CSI-1 receiver cannot tolerate reception of an
EOL packet followed by an EOF packet, the
SN65LVDS315 can also be configured in a mode that
allows it to predict the number of visible lines and
generate an EOF packet at the proper time. A high
level on the the MODE input enables a line counter
within the SN65LVDS315 that counts every HS rising
edge while VS is high. The OMAP processors require
the MODE signal to be set high.
The counter value is stored into register frame_count when VS transitions low and the counter is reset to zero.
When the counter reaches the value stored in frame_count, an EOF packet is transmitted instead of the EOL
packet. As long as the active number of lines remains constant, this implementation ensures proper transmission
of EOF.
If, however, the camera sensor changes the number of transmitted lines during active transmission, the EOF will
not be generated properly for that particular frame.
If the number of lines transmitted by the camera sensor increases, an EOF will be sent too early. All active lines
following EOF are then ignored during this particular frame. Blanking will be signaled instead. The frame_count
register will be updated at the end of the frame in order to properly transmit the next frame.
Figure 7.
If the number of lines transmitted by the camera sensor decreases, EOL will be sent improperly after the last
camera line. When VS is detected low, the EOF command will follow.
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