Micrel, Inc. KS8995XA Pin Description (by Number) Pin Number 1 Pin Name MDI-XDIS Type(1) Ipd 2 GNDA Gnd 3 VDDAR P 4 RXP1 I 1 Physical receive signal + (differential). 5 RXM1 I 1 Physical receive signal – (differential). 6 GNDA Gnd Port 1-5 Pin Function(2) Disable auto MDI/MDI-X. PD (default) = normal operation. PU = disable auto MDI/MDI-X on all ports. Analog ground. 1.8V analog VDD. Analog ground. 7 TXP1 O 1 Physical transmit signal + (differential). 8 TXM1 O 1 Physical transmit signal – (differential). 9 VDDAT P 10 RXP2 I 2 Physical receive signal + (differential). 11 RXM2 I 2 Physical receive signal – (differential). 12 GNDA Gnd 13 TXP2 O 2 Physical transmit signal + (differential). 14 TXM2 O 2 Physical transmit signal – (differential). 15 VDDAR P 16 GNDA Gnd 17 ISET 18 VDDAT P 19 RXP3 I 3 Physical receive signal + (differential). 20 RXM3 I 3 Physical receive signal -(differential). 21 GNDA Gnd 22 TXP3 O 3 Physical transmit signal + (differential). 23 TXM3 O 3 Physical transmit signal – (differential). 24 VDDAT P 25 RXP4 I 4 Physical receive signal + (differential). 4 Physical receive signal -(differential). 2.5V or 3.3V analog VDD. Analog ground. 1.8V analog VDD. Analog ground. Set physical transmit output current. Pull-down with a 3.01kΩ1% resistor. 2.5V or 3.3V analog VDD. Analog ground. 2.5V or 3.3V analog VDD. 26 RXM4 I 27 GNDA Gnd 28 TXP4 O 4 Physical transmit signal + (differential). 29 TXM4 O 4 Physical transmit signal – (differential). 30 GNDA Gnd Analog ground. Analog ground. Notes: 1. P = Power supply. I = Input. O = Output. I/O = Bidirectional. Gnd = Ground. Ipu = Input w/internal pull-up. Ipd = Input w/internal pull-down. Ipd/O = Input w/internal pull-down during reset, output pin otherwise. Ipu/O = Input w/internal pull-up during reset, output pin otherwise. 2. PU = Strap pin pull-up. PD = Strap pull-down. Otri = Output tristated. September 2008 9 M9999-091508
