Specification
Sampling Rate: 20kHz
Cable length: 3m(Ethernet) + 0.2m(PCB to FPGA) + 1m (RJ45Keystone to BiSS) = ~4m
System Delay
Delay due to line propagation: 54.1ns
System delay: 96ns
Total Delay: ~150ns
Effects of Different Frequency
@2MHz
Frequency: 2MHz(500ns) Max
Bit to transfer: 23bits
Time to transfer: 11.5us → 96.9kHz (Can finish transfer before next sample starts)
BiSS Sample at falling edge
@4MHz
Frequency: 4MHz(250ns) Max
Bit to transfer: 23bits
Time to transfer: 5.75us → 173.9kHz (Can finish transfer before next sample starts)
Change to Sample at rising edge
SPI Mode 3
CPOL = 1
CPHA = 0