KSZ8851-16MLL TR Micrel Inc, KSZ8851-16MLL TR Datasheet - Page 20

• Manufacturer Part Number: KSZ8851-16MLL TR
• Description: Single Ethernet Port + Generic (16-bit) Bus Interface( )
• Manufacturer: Micrel Inc

Specifications of KSZ8851-16MLL TR

• Operating Supply Voltage (typ): 3.3V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / RoHS Status: Compliant

LinkMD
The KSZ8851-16MLL 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
Usage
LinkMD
P1CR[10] to enable manual control over the pair used to transmit the LinkMD
August 2009
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
can be run at any time by ensuring that Auto-MDIX has been disabled. To disable Auto-MDIX, write a ‘1’ to
Cable Diagnostics
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
20
Link Mode Set ?
Link Mode Set
Operation
Join Flow
Parallel
Idles
YES
NO
Listen for 10BASE-T L i n k
®
pulse. The self-clearing cable diagnostic
Pulses
®
register (0xF4).
KSZ8851-16MLL/MLLI
M9999-083109-2.0