KSZ8721B Micrel Inc, KSZ8721B Datasheet - Page 4

• Manufacturer Part Number: KSZ8721B
• Description: IC TXRX PHY 10/100 2.5V 48-SSOP
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KSZ8721B

• Number Of Drivers/receivers: 1/1
• Protocol: MII, RMII
• Voltage - Supply: 2.375 V ~ 2.625 V
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Data Rate: 100Mbps
• Supply Voltage Range: 2.375V To 2.625V
• Logic Case Style: SSOP
• No. Of Pins: 48
• Operating Temperature Range: 0°C To +70°C
• Msl: MSL 2 - 1 Year
• Ic Function: Transceiver IC
• Termination Type: SMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1627 - BOARD EVALUATION FOR KSZ8721BMC576-1626 - BOARD EVALUATION FOR KSZ8721BL
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1026-5; 576-1510-5; 576-1510-5; KSZ8721B

KS8721B/BT
Table Of Contents
M9999-041405
Pin Description ............................................................................................................................................................ 6
Strapping Option ......................................................................................................................................................... 9
Pin Configuration ...................................................................................................................................................... 10
Introduction
Register Map
100BaseTX Transmit ........................................................................................................................................... 11
100BaseTX Receive ............................................................................................................................................ 11
PLL Clock Synthesizer ......................................................................................................................................... 11
Scrambler/De-scrambler (100BaseTX only) ........................................................................................................ 11
10BaseT Transmit ............................................................................................................................................... 11
10BaseT Receive ................................................................................................................................................ 11
SQE and Jabber Function (10Base only) ............................................................................................................ 11
Auto-Negotiation .................................................................................................................................................. 11
MII Management Interface ................................................................................................................................... 12
MII Data Interface ................................................................................................................................................ 12
RMII Signal Definition .......................................................................................................................................... 13
Reference Clock .................................................................................................................................................. 13
Carrier Sense/Receive Data Valid ....................................................................................................................... 13
Receive Data ....................................................................................................................................................... 13
Transmit Enable ................................................................................................................................................... 13
Transmit Data ...................................................................................................................................................... 14
Collision Detection ............................................................................................................................................... 14
RX_ER
RMII AC Characteristics ...................................................................................................................................... 14
Auto Crossover (Auto MDI/MDI-X) ...................................................................................................................... 15
Power Management ............................................................................................................................................. 16
100BT FX Mode ................................................................................................................................................... 16
Media Converter Option ....................................................................................................................................... 16
Register 0h: Basic Conrol ................................................................................................................................... 17
Register 1h: Basic Status .................................................................................................................................... 18
Register 2h: PHY Identifier 1 .............................................................................................................................. 18
Register 3h: PHY Identifier 2 .............................................................................................................................. 18
Register 4h: Auto-Negotiation Advertisement ..................................................................................................... 18
Register 5h: Auto-Negotiation Link Partner Ability .............................................................................................. 18
Register 6h: Auto-Negotiation Expansion ........................................................................................................... 19
Register 7h: Auto-Negotiation Next Page ........................................................................................................... 19
Register 8h: Link Partner Next Page Ability ........................................................................................................ 19
Register 15h: RXER Counter .............................................................................................................................. 20
Register 1bh: Interrupt Control/Status Register .................................................................................................. 20
Register 1fh: 100BaseTX PHY Controller ........................................................................................................... 20
Transmit Clock ............................................................................................................................................. 12
Receive Clock .............................................................................................................................................. 12
Transmit Enable ........................................................................................................................................... 12
Receive Data Valid ...................................................................................................................................... 12
Error Signals ................................................................................................................................................ 12
Carrier Sense ............................................................................................................................................... 12
Collision ....................................................................................................................................................... 13
........................................................................................................................................................... 11
........................................................................................................................................................... 14
........................................................................................................................................................... 17
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Micrel, Inc.
April 2005