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RM44 Clock Latch Investigation
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Try Notion
RM44 Clock Latch Investigation
Date
December 22, 2020
Tags
Measurement
Physical Test
Keyword
delay
From Testing
1MHz,4MHz,8MHz: Delay → 150ns
System Wiring Length: 3m(Ethernet) + 125mm(PCB to RJ45Keystone) + 0.2m(PCB to FPGA) + 1m (RJ45Keystone to BiSS) = 4.325m
From propagation delay → Delay is 12.5ns/m
Delay due to line propagation = 54.1ns
⏲️
96ns 89.2ns is the system delay
From Datasheet
From (Renishaw) the delay should be 42.5ns
RS422 IC: Transmit → 6.8ns, Receive → 30.4ns, Sum = 37.2ns
System Delay is 79.7ns
For Reference
Obtained Measurement
125KHz
500kHz
3MHz
4MHz
8MHz