KSZ8851-16MLLJ_10 MICREL [Micrel Semiconductor], KSZ8851-16MLLJ_10 Datasheet - Page 22

• Manufacturer Part Number: KSZ8851-16MLLJ_10
• Description: Single-Port Ethernet MAC Controller with 8-Bit or 16-Bit Non-PCI Interface
• Manufacturer: MICREL [Micrel Semiconductor]

LinkMD® Cable Diagnostics
The KSZ8851-16MLLJ LinkMD
problems such as open circuits, short circuits, and impedance mismatches.
LinkMD
the shape of the reflected signal. Timing the pulse duration gives an indication of the distance to the cabling fault with a
maximum distance of 200m and an accuracy of ±2m. Internal circuitry displays the TDR information in a user-readable
digital format in register P1SCLMD[8:0].
Note: cable diagnostics are only valid for copper connections – fiber-optic operation is not supported.
Access
LinkMD
March 2010
Micrel, Inc.
®
®
is initiated by accessing register P1SCLMD, the PHY special control/status & LinkMD
works by sending a pulse of known amplitude and duration down the MDI and MDI-X pairs and then analyzes
B y p a s s A u t o N e g o ti a t i o n
Start Auto Negotiation
Force Link Setting
and Set Link Mode
YES
®
uses time domain reflectometry (TDR) to analyze the cabling plant for common cabling
Figure 5. Auto Negotiation and Parallel Operation
NO
Attempt Auto
Negotiation
Listen for 100BASE-TX
22
Link Mode Set ?
Link Mode Set
Operation
Join Flow
Parallel
Idles
YES
NO
Listen for 10BASE-T L i n k
Pulses
®
register (0xF4).
M9999-030210-1.0
KSZ8851-16MLLJ