Spyder 3 GigE User’s Manual
DALSA 03-032-10158-06
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Table 9: tOverhead Values
tOVERHEAD
Sensor Size
# Taps
Readout Time
1024
1
725ns
1024 2
450ns
2048
1
1400ns
2048 2
725ns
Latency Calculation
Latency = Ethernet_Aquisitio LAN_Preparatio LAN_Transfe
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
8128
(default)
pkt_header_size
64
clk_freq (MHz)
40
LAN_clk_freq (MHz)
33
num_taps
1 or 2
pixel_width
8 or 12
interline_delay (
μ
s)
1k 1 tap
1600
1k 2 tap
1325
2k 1 tap
2275
2k 2 tap
1600
line_size
1024 or 2048
LAN Preparation Time
LAN_Preparation_Time = (pkt_payloa pkt_header_size) / (LAN_clk_freq * 4)
LAN Transfer Time
LAN_Transfer_Time = (pkt_payloa pkt_header_size) / 125MB/s
Overhead Delay
Overhead_Delay can range from 5 to 6
μ
s and is dependent upon the internal operations
of your computer.
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