Camera interfaces
150
Goldeye G/CL Technical Manual V4.1.1
FVAL - Frame Valid
The synchronization signal FVAL is used to indicate the frame transfer phase. When
rising, it indicates the start of a new frame transfer phase. When falling, it indicates
the end of the frame transfer.
Every frame includes a certain number of lines. All lines transferred during this
time slot are valid.
LVAL - Line Valid
The synchronization signal LVAL is used to indicate a line transfer phase within the
current frame transfer. When rising, it indicates the start of a new line transfer
phase. When falling, it indicates the end of the line transfer phase.
The LVAL signal is valid only while FVAL is high.
DVAL - Data Valid
The synchronization signal DVAL is used to indicate a valid pixel within the current
line transfer phase. The DVAL bit is high for the transfer of one pixel. When high, it
indicates that the pixel is valid. If low, the pixel must be ignored. A pixel is only
valid, if all of the FVAL, LVAL and DVAL signals are high.
To make use of the DVAL signal, the frame grabber in use must be able to process
it.
Sequential overview
After the start of the data transfer, frames and lines are transferred using the
sequence described below.
1. The FVAL signal is set to
high
and indicates the start of a new frame transfer.
2. A gap occurs before the LVAL signal is set to
high
.
Figure 45: Camera Link data transfer
FVAL
LVAL
8
3
2
4
6
7
5
1
9
10
2
1
3
4
DVAL
