ksz8021rnli Micrel Semiconductor, ksz8021rnli Datasheet - Page 4

• Manufacturer Part Number: ksz8021rnli
• Description: 10base-t/100base-tx Phy With Rmii Support
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
Contents
General Description .............................................................................................................................................................. 1
Features ................................................................................................................................................................................. 1
Functional Diagram............................................................................................................................................................... 1
Applications........................................................................................................................................................................... 2
Ordering Information ............................................................................................................................................................ 2
Revision History.................................................................................................................................................................... 3
Contents................................................................................................................................................................................. 4
List of Figures........................................................................................................................................................................ 6
List of Tables ......................................................................................................................................................................... 7
Pin Configuration – KSZ8021RNL / KSZ8031RNL.............................................................................................................. 8
Pin Description – KSZ8021RNL / KSZ8031RNL ................................................................................................................. 9
Strapping Options – KSZ8021RNL / KSZ8031RNL .......................................................................................................... 11
Functional Description: 10Base-T/100Base-TX Transceiver ......................................................................................... 12
RMII Data Interface.............................................................................................................................................................. 15
RMII Signal Diagram – for KSZ8021/31RNL...................................................................................................................... 16
Back-to-Back Mode – 100Mbps Copper Repeater / Media Converter............................................................................ 18
MII Management (MIIM) Interface....................................................................................................................................... 19
Interrupt (INTRP) ................................................................................................................................................................. 19
HP Auto MDI/MDI-X ............................................................................................................................................................. 19
LinkMD
August 2010
100Base-TX Transmit....................................................................................................................................................... 12
100Base-TX Receive........................................................................................................................................................ 12
10Base-T Transmit ........................................................................................................................................................... 12
10Base-T Receive ............................................................................................................................................................ 13
Scrambler/De-scrambler (100Base-TX only).................................................................................................................... 13
PLL Clock Synthesizer...................................................................................................................................................... 13
Auto-Negotiation ............................................................................................................................................................... 13
RMII Signal Definition ....................................................................................................................................................... 15
RMII – 25MHz Clock Mode............................................................................................................................................... 16
RMII – 50MHz Clock Mode............................................................................................................................................... 17
RMII Back-to-Back Mode.................................................................................................................................................. 18
Straight Cable ................................................................................................................................................................... 20
Crossover Cable ............................................................................................................................................................... 20
Reference Clock (REF_CLK) ....................................................................................................................................... 15
Transmit Enable (TXEN) .............................................................................................................................................. 15
Transmit Data [1:0] (TXD[1:0]) ..................................................................................................................................... 15
Carrier Sense/Receive Data Valid (CRS_DV).............................................................................................................. 15
Receive Data [1:0] (RXD[1:0]) ...................................................................................................................................... 16
Receive Error (RXER) .................................................................................................................................................. 16
Collision Detection........................................................................................................................................................ 16
®
Cable Diagnostics................................................................................................................................................ 21
4
KSZ8021RNL / KSZ8031RNL
M9999-082710-1.0