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TAU-0640-00-10, version 110
June 2011
4-1
4
Tau 640 Digital Data Channel
The Tau 640 camera provides three digital data channels which can be configured through
software from the generic pinout definitions shown in Table 5-2 on page 5-2. The BT.656
channel output is a digitally encoded analog format which contains image, symbol, and color
information. The CMOS channel is a parallel image data output. The Legacy LVDS channel is
common with the FLIR Photon camera. Designers and integrators should provide electrostatic
discharge (ESD) and over voltage protection for Tau 640 cameras using digital data channels
because the digital signals on the 50-pin Hirose connector are routed directly to the FPGA.
4.1 XP Bus Setting—BT.656 Digital Interface
The BT.656 parallel output is a common interface which will drive many LCD displays. The data
is digitally encoded NTSC/PAL video and will have AGC, DDE, symbols, and color included. The
signal levels are 0 - 3.3 V CMOS logic and are intended to drive boards mounted directly to the
Tau 640 camera. The BT.656 output is not intended to drive a cable. Table 4-1 shows the
connector pin definitions with BT.656 enabled. Also shown in the table are the optional discrete
input pins. Figure 4-1 details BT.656 format and timing. The horizontal pixels are interpolated
such that every eighth pixel is replicated (640 x 9/8 = 720) to produce the 720 pixels per line
required by the format.
Table 4-1: 50-pin Hirose connector interface with BT.656 output enabled
Pin #
Signal Name
Pin #
Signal Name
1
RS232_TX
2
RS232_RX
3
DISCRETE6
4
DISCRETE7
5
DGND
6
DGND
7
unused
8
unused
9
LVDS_CLK_P
10
LVDS_CLK_N
11
LVDS_SYNC_P
12
LVDS_SYNC_N
13
LVDS_DATA_P1
14
LVDS_DATA_N1
15
LVDS_DATA_P2
16
LVDS_DATA_N2
17
DGND
18
DGND
19
DISCRETE0
20
DISCRETE1
21
EXT_SYNC
22
unused
23
DISCRETE2
24
DISCRETE3
25
DISCRETE4
26
DISCRETE5
27
DGND
28
DGND
29
BT656_DATA7
30
BT656_DATA6
31
BT656_DATA5
32
BT656_DATA4
33
BT656_DATA3
34
BT656_DATA2
35
BT656_DATA1
36
BT656_DATA0
37
DGND
38
DGND
39
BT656_CLK
40
unused
41
DGND
42
DGND
43
VID_OUT_H
44
VID_OUT_L
45
DGND
46
3V3
47, 49
MAIN_PWR_RTN
48, 50
MAIN_PWR