
Application Note
3
LXT9784 Octal 10/100 Transceiver Hardware Integrity Function Overview
Contents
1.0
Connection Types
......................................................................................................5
1.1
Isolating Cabling Problems....................................................................................5
Transmission Lines and Return Wave Theory
...............................................7
2.1
Cable Terminations and Return Loss....................................................................7
2.2
Checking for Cable Length....................................................................................9
2.2.1
Accuracy of Measurement........................................................................9
Hardware Integrity Management Register
.....................................................10
Hardware Integrity Test Function
......................................................................11
Hardware Integrity Test Program
......................................................................12
2.0
3.0
4.0
5.0
Figures
1
2
Forward and Return Waves ..................................................................................8
HWI Test Algorithm.............................................................................................11
Tables
1
2
3
4
Typical CAT5 Return Loss ....................................................................................7
Tx and Rx Return Loss..........................................................................................8
Register 29 (1D Hex) Hardware Integrity Control Register Bit Assignments ......10
Register 29 (1D Hex) Hardware Integrity Control Register Bit Definitions ..........10