Dalsa SG-10-01k80 User Manual page 29

Spyder3 GigE User's Manual
2048
2048
Latency Calculation
Latency = Ethernet_Aquisition_Time + LAN_Preparation_Time + LAN_Transfer_Time +
Overhead_Delay
Ethernet Acquisition Time
If pkt_payload_size equals line size use the following equation
Ethernet_Acquisition_Time = (pkt_payload_size / (clk_freq * num_taps * round_up
(pixel_width / 8))) + (interline_delay * INT (pkt_payload_size / line_size))
If pkt_payload_size does not equal line size use the following equation
Ethernet_Acquisition_Time = (pkt_payload_size / (clk_freq * num_taps * round_up
(pixel_width / 8)))
Table 10
pkt_payload_size
pkt_header_size
clk_freq (MHz)
LAN_clk_freq (MHz)
num_taps
pixel_width
interline_delay (μs)
line_size
LAN Preparation Time
LAN_Preparation_Time = (pkt_payload_size + pkt_header_size) / (LAN_clk_freq * 4)
LAN Transfer Time
LAN_Transfer_Time = (pkt_payload_size + pkt_header_size) / 125MB/s
Overhead Delay
Overhead_Delay can range from 5 to 6μs and is dependent upon the internal operations
of your computer.
DALSA
PRELIMINARY
1 1400ns
2 725ns
1k 1 tap
1k 2 tap
2k 1 tap
2k 2 tap
8128 (default)
64
40
33
1 or 2
8 or 12
1600
1325
2275
1600
1024 or 2048
29
03-032-10158-04