104
iPORT CL-GigE External Frame Grabber User Guide
a.
The valid state of FVAL and LVAL is high when they are set as level-high sensitive or rising-edge
sensitive. Their valid state is low when they are set as level-low sensitive or falling-edge sensitive.
b.
If LVAL is valid before FVAL becomes valid, the grabber drops the full line.
c.
Data valid is defined by FVAL valid (note a), LVAL valid (note a), and DVAL valid (note d).
d.
The valid state of DVAL is high when it is set as level-high sensitive, and low when set as level-low
sensitive. DVAL is always valid in the grabber when the parameter PixelBusDataValidEnabled is off.
e.
If FVAL becomes invalid and LVAL is still valid, the line is truncated.
LVAL invalid
(Automatic Internal
Retrigger disabled)
Data valid
c
,
d
t
LI2DV
1
N/A
1
LVAL invalid
(Automatic Internal
Re-trigger enabled)
Data valid
t
LI2DV
16
N/A
16
Data invalid
LVAL invalid
,
c
,
d
t
DI2LI
0
N/A
0
LVAL invalid
FVAL invalid
t
LI2FI
0
e
N/A
N/A
Data invalid
FVAL invalid
,
c
,
d
t
DI2FI
0
e
N/A
N/A
FVAL invalid
FVAL valid
t
FI2FV
1
1
1
FVAL invalid
Data valid
c
,
d
t
FI2DV
1
N/A
N/A
Last LVAL invalid
Data valid
t
LLI2DV
16
N/A
16
FVAL valid
FVAL invalid
t
FV2FI
16
1
1
FVAL valid
FVAL valid
t
2FV2FV
17
17
17
Table 28: Timing Values for All Cases
From
To
Symbol
Case 1
(level)
(
t
cp)
Case 2
(edge)
(
t
cp)
Case 3
(both)
(
t
cp)
