KSZ8721B TR Micrel Inc, KSZ8721B TR Datasheet - Page 4

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

Specifications of KSZ8721B TR

• 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
• 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: 576-1026-2

Table Of Contents
M9999-030106
Pin Description .............................................................................................................................................................6
Strapping Option ...........................................................................................................................................................9
Pin Confi guration ........................................................................................................................................................10
Introduction
Register Map
100BaseTX Transmit ............................................................................................................................................. 11
100BaseTX Receive ............................................................................................................................................. 11
PLL Clock Synthesizer ..........................................................................................................................................
PLL Clock Synthesizer ..........................................................................................................................................
PLL Clock Synthesizer
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 Defi nition ............................................................................................................................................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 Identifi er 1 ................................................................................................................................18
Register 3h: PHY Identifi er 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 ...............................................................................................................................
Register 15h: RXER Counter ...............................................................................................................................
Register 15h: RXER Counter
Register 1bh: Interrupt Control/Status Register ...................................................................................................
Register 1bh: Interrupt Control/Status Register ...................................................................................................
Register 1bh: Interrupt Control/Status Register
Register 1fh: 100BaseTX PHY Controller ............................................................................................................
Register 1fh: 100BaseTX PHY Controller ............................................................................................................
Register 1fh: 100BaseTX PHY Controller
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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