Specifications

Micrel, Inc.
KSZ8895MQ/RQ/FMQ
Contents
System Level Applications ........................................................................................................................................... 13
Pin Configuration .......................................................................................................................................................... 15
Pin Description .............................................................................................................................................................. 16
Pin for Strap-In Options ................................................................................................................................................ 23
Introduction ................................................................................................................................................................... 26
Functional Overview: Physical Layer Transceiver .................................................................................................... 26
100BASE-TX Transmit ............................................................................................................................................... 26
100BASE-TX Receive ................................................................................................................................................ 26
PLL Clock Synthesizer ................................................................................................................................................ 27
Scrambler/Descrambler (100BASE-TX only) ............................................................................................................. 27
100BASE-FX Operation .............................................................................................................................................. 27
100BASE-FX Signal Detection ................................................................................................................................... 27
100BASE-FX Far End Fault ........................................................................................................................................ 27
10BASE-T Transmit .................................................................................................................................................... 27
10BASE-T Receive ..................................................................................................................................................... 27
MDI/MDI-X Auto Crossover ........................................................................................................................................ 27
Straight Cable ......................................................................................................................................................... 28
Crossover Cable ..................................................................................................................................................... 29
Auto-Negotiation ......................................................................................................................................................... 29
On-Chip Termination Resistors .................................................................................................................................. 31
Internal 1.2V LDO Controller ...................................................................................................................................... 31
Functional Overview: Power Management ................................................................................................................. 31
Normal Operation Mode ............................................................................................................................................. 31
Energy Detect Mode ................................................................................................................................................... 32
Soft Power Down Mode .............................................................................................................................................. 32
Power Saving Mode .................................................................................................................................................... 32
Port-based Power Down Mode ................................................................................................................................... 32
Functional Overview: Switch Core .............................................................................................................................. 33
Address Look-Up ........................................................................................................................................................ 33
Learning ...................................................................................................................................................................... 33
Migration ..................................................................................................................................................................... 33
Aging ........................................................................................................................................................................... 33
Forwarding .................................................................................................................................................................. 33
Switching Engine ........................................................................................................................................................ 33
Media Access Controller (MAC) Operation ................................................................................................................ 33
Inter-Packet Gap (IPG) ........................................................................................................................................... 34
Backoff Algorithm .................................................................................................................................................... 34
Late Collision .......................................................................................................................................................... 34
Illegal Frames ......................................................................................................................................................... 34
Flow Control ............................................................................................................................................................ 34
Half-Duplex Back Pressure .................................................................................................................................... 37
Broadcast Storm Protection .................................................................................................................................... 37
MII Interface Operation ............................................................................................................................................... 38
March 12, 2014
4
Revision 1.7