FLIR Tau 640, User Manual

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4—Tau 640 Digital Data Channel Tau 640 User’s Manual
4-2 June 2011 TAU-0640-00-10, version 110
0 1 1 1 1 - 3
F
F 0
0 0
0 X
Y 8
0 1
0 8
0 1
0 8
0 1
0 F
F 0
0 0
0 X
Y C
b
Y
C
r
Y
C
b
Y
C
r
Y
C
r
Y
F
F 0
0 0
0 X
Y
s l e x i P d e t i s o C e d o C V A S g n i k n a l B e d o C V A E
C
b
Y
C
r
Y
C
b
Y
EAV Code
4 clocks 268 clocks 4 clocks
1716 clocks
H Control Signal
Start of digital line Start of digital active line
1716 clocks @ 27MHz = 63.55us/line
63.55us/line x 525 lines = 29.97 ms/frame
D7 D6 D5 D4 D3 D2 D1 D0
1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0
1 F V H P3 P2 P1 P0
0 0 0 0 0 0 0 0
Preamble
Status Word
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
Blanking
(V = 1)
Field 1 Active
(V = 0)
Blanking
(V = 1)
Field 2 Active
(V = 0)
H=1
EAV
H=0
SAV
Frame Line 1
Frame Line 21, Field1 Line 0
Frame Line 264
Frame Line 283, Field2 Line 0
Frame Line 525, Field2 Line 242
LINE 4
LINE 266
LINE 3
Field 1
(F = 0)
Odd
Field 2
(F = 1)
Even
Line
Number
F V
H
EAV
V
SAV
4 - 20
21 - 263
264 - 265
266 - 282
283 - 525
0
0
0
1
1
1
0
1
1
0
0 1
0 1
0 1
0 1
0 1
1440 clocks
20 blank lines
243 active lines
19 blank lines
243 active lines
Frame Line 263, Field1 Line 242
Frame Line 282
Frame Line 20
8
Any Clock
Any Clock Enable
Cb, Y, Cr, Y
BT.656 Formatter
50.625MHz * 8/15
8
'1'
'0' D
r
D
f
C
r
C
f
Q
27MHz
8 8
D Q
BT.656 Data
BT.656 Clock
27MHz
YCbCr BT.656 Clock
BT.656 Data
Registers forced
into IOBs
This FIFO is outside the
BT.656 Formatter
27MHz
11 11
we re
rwc wwc
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