Micrel, Inc.
KSZ9021RL/RN
Contents
Pin Configuration – KSZ9021RL..........................................................................................................................................8
Pin Description – KSZ9021RL..............................................................................................................................................9
Strapping Options – KSZ9021RL.......................................................................................................................................14
Pin Configuration – KSZ9021RN........................................................................................................................................15
Pin Description – KSZ9021RN ...........................................................................................................................................16
Strapping Options – KSZ9021RN ......................................................................................................................................21
Functional Overview...........................................................................................................................................................22
Functional Description: 10Base-T/100Base-TX Transceiver.........................................................................................23
100Base-TX Transmit....................................................................................................................................................... 23
100Base-TX Receive........................................................................................................................................................ 23
Scrambler/De-scrambler (100Base-TX only).................................................................................................................... 23
10Base-T Transmit ........................................................................................................................................................... 23
10Base-T Receive ............................................................................................................................................................ 23
Functional Description: 1000Base-T Transceiver ..........................................................................................................24
Analog Echo Cancellation Circuit ..................................................................................................................................... 24
Automatic Gain Control (AGC) ......................................................................................................................................... 24
Analog-to-Digital Converter (ADC) ................................................................................................................................... 24
Timing Recovery Circuit.................................................................................................................................................... 25
Adaptive Equalizer............................................................................................................................................................ 25
Trellis Encoder and Decoder............................................................................................................................................ 25
Functional Description: 10/100/1000 Transceiver Features ..........................................................................................25
Auto MDI/MDI-X................................................................................................................................................................ 25
Pair- Swap, Alignment, and Polarity Check...................................................................................................................... 26
Wave Shaping, Slew Rate Control and Partial Response................................................................................................ 26
PLL Clock Synthesizer...................................................................................................................................................... 26
Auto-Negotiation.................................................................................................................................................................26
RGMII Interface....................................................................................................................................................................28
RGMII Signal Definition .................................................................................................................................................... 29
RGMII Signal Diagram...................................................................................................................................................... 29
RGMII In-band Status....................................................................................................................................................... 30
MII Management (MIIM) Interface.......................................................................................................................................30
Interrupt (INT_N)..................................................................................................................................................................30
LED Mode.............................................................................................................................................................................31
Single LED Mode.............................................................................................................................................................. 31
Tri-color Dual LED Mode .................................................................................................................................................. 31
NAND Tree Support ............................................................................................................................................................32
Power Management ............................................................................................................................................................33
M9999-101309-1.1
October 2009
4
MICREL [ MICREL SEMICONDUCTOR ]
