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KSZ8721BL Datasheet(PDF) 8 Page - Micrel Semiconductor |
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KSZ8721BL Datasheet(HTML) 8 Page - Micrel Semiconductor |
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8 / 35 page  Micrel, Inc. KS8721BL/SL June 2009 8 M9999-062509-1.3 Pin Number Pin Name Type (1) Pin Function 24 VDDIO P Digital IO 2.5/3.3V tolerant power supply. 3.3V power input of voltage regulator. See “Circuit Design Ref. for Power Supply” section for details. 25 INT#/ PHYAD0 Ipu/O Management Interface (MII) Interrupt Out. Interrupt level set by Register 1f, bit 9. During reset, latched as PHYAD[0]. See “Strapping Options” section for details. 26 LED0/ TEST Ipu/O Link/Activity LED Output. The external pull-down enable test mode and only used for the factory test. Active low. Link/Act Pin State LED Definition PHYAD0 No Link H “Off” Link L “On” Act – “Toggle” 27 LED1/ SPD100/ nFEF Ipu/O Speed LED Output. Latched as SPEED (Register 0, bit 13) during power-up/ reset. See “Strapping Options” section for details. Active low. Speed Pin State LED Definition 10BT H “Off” 100BT L “On” 28 LED2 Ipu/O Full-duplex LED Output. Latched as DUPLEX (register 0h, bit 8) during power-up/ reset. See “Strapping DUPLEX Options” section for details. Active low. Duplex Pin State LED Definition Half H “Off” Full L “On” 29 LED3/ NWAYEN Ipu/O Collision LED Output. Latched as ANEG_EN (register 0h, bit 12) during power-up/ reset. See “Strapping Options” section for details. Collision Pin State LED Definition No Collision H “Off” Collision L “On” 30 PD# Ipu Power Down. 1 = Normal operation, 0 = Power-down. Active low. 31 VDDRX P Analog 2.5V power supply. See “Circuit Design Ref. for Power Supply” section for details. 32 RX- I Receive Input. Differential receive input pins for 100FX, 100BASE-TX, or 10BASE-T. 33 RX+ I Receive Input: Differential receive input pin for 100FX, 100BASE-TX, or 10BASE-T. 34 FXSD/ FXEN Ipd/O Fiber Mode Enable / Signal Detect in Fiber Mode. If FXEN = 0, FX mode is disable. The default is “0”. See “100BT FX Mode” section for more details. 35 GND Gnd Ground. 36 GND Gnd Ground. 37 REXT I External resistor (6.49kW ) connects to REXT and GND. 38 VDDRCV P Analog 2.5V power supply. 2.5V power output of voltage regulator. See “Circuit Design Ref. for Power Supply” section for details. 39 GND Gnd Ground. 40 TX- O Transmit Outputs: Differential transmit output for 100FX, 100BASE-TX, or 10BASE-T. 41 TX+ O Transmit Outputs: Differential transmit output for 100FX, 100BASE-TX, or 10BASE-T. 42 VDDTX P Transmitter 2.5V power supply. See “Circuit Design Ref. for Power Supply” section for details. 43 GND Gnd Ground. |
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