FLIR Tau Camera TAU-0035-00-10 User Manual page 46

4—Tau Digital Data Channel
Start of digital line
E A V C o d e B a l n k n i
F 0 0 X 8 1 8 1
F 0 0 Y 0 0 0 0
4 clocks 268 clocks
D7 D6
1 1
Preamble
0 0
0 0
Status Word
1 F
Frame Line 1
Blanking
LINE 4
(V = 1)
Frame Line 20
Field 1
Frame Line 21, Field1 Line 0
(F = 0)
Field 1 Active
Odd
(V = 0)
Frame Line 263, Field1 Line 242
Frame Line 264
Blanking
LINE 266
(V = 1)
Frame Line 282
Field 2 Frame Line 283, Field2 Line 0
Field 2 Active
(F = 1)
(V = 0)
Even Frame Line 525, Field2 Line 242
LINE 3
H=1 H=0
EAV SAV
This FIFO is outside the
BT.656 Formatter
11
wwc
8
Cb, Y, Cr, Y
Any Clock Enable
we
Any Clock
50.625MHz * 8/15
27MHz
YCbCr
NOTES: The FIFO Write Clock can be any value as long as it is derived from and locked to 50.626MHz.
The FIFO must store at least 1440 bytes and must be filled at a minimum rate of 1 byte per
27MHz clock period (faster is OK).
A full line must be made available every 1,716 27MHz clock periods.
Since the BT.656 Formatter has no knowledge of upstream video timing, no data shall be
written into the FIFO until the first active line (line 1, field 1) of video is available after reset.
Incoming video must conform to the active/blank times specified in the Timing section of this
document.
Figure 4-1: BT.656 Video Formatter Timing and Block Diagram
4-2
H Control Signal
Start of digital active line
g S A V C o d e
8 1 F 0 0 X C C
Y Y
0 0 F 0 0 Y b r
4 clocks
1716 clocks
D5 D4 D3 D2 D1 D0
1 1 1 1 1 1
0 0 0 0 0 0
0 0 0 0 0 0
V H P3 P2 P1 P0
PixelsPerLine
11
rwc
8
BT.656 Formatter
re
27MHz
June 2011
1716 clocks @ 27MHz = 63.55us/line
63.55us/line x 525 lines = 29.97 ms/frame
C o i s e t d P x i e s l
C C C C C
Y Y Y Y
b r b r b
1440 clocks
F = 0 for field 1, F = 1 for field 2
V = 1 during vertical blanking
H = 0 at SAV, H = 1 at EAV
P3 - P0 = protection bits
P3 = V XOR H
P2 = F XOR H
P1 = F XOR V
P0 = F XOR V XOR H
Line H V
F V
Number EAV SAV
1 - 3 1 1 1 0
4 - 20 0 1 1 0
21 - 263 0 0 1 0
264 - 265 0 1 1 0
266 - 282 1 1 1 0
283 - 525 1 0 1 0
Registers forced
into IOBs
0 = 640
1 = 720
8
D Q
'0' D
r
Q
'1' D
f
C
r
C
f
27MHz
BT.656 Clock
BT.656 Data
TAU-0035-00-10, version 150
Tau User's Manual
EAV Code
C F 0 0 X
Y Y
r F 0 0 Y
20 blank lines
243 active lines
19 blank lines
243 active lines
8
BT.656 Data
BT.656 Clock