KSZ8775CLX TABLE 2-1: SIGNALS (CONTINUED) Num Pins Pin Name Type Port 6 RXP1 I 1 Port 1 physical receive signal + (differential). 7 RXM1 I 1 Port 1 physical receive signal -(differential). 8 TXP1 O 1 Port 1 physical transmit signal + (differential). 9 TXM1 O 1 Port 1 physical transmit signal -(differential). 10 RXP2 I 2 Port 2 physical receive signal + (differential). 11 RXM2 I 2 Port 2 physical receive signal -(differential). 12 TXP2 O 2 Port 2 physical transmit signal + (differential) 13 TXM2 O 2 Port 2 physical transmit signal -(differential). 14 VDDAT P 15 RXP3 I 3 Port 3 physical receive signal + (differential). 16 RXM3 I 3 Port 3 physical receive signal -(differential). 17 TXP3 O 3 Port 3 physical transmit signal + (differential). 18 TXM3 O 3 Port 3 physical transmit signal – (differential). 19 NC NC No connect 20 NC NC No connect 21 GNDA GND Analog ground Interrupt. Active low. This pin is an open-drain output pin. Note: an external pull-up resistor is needed on this pin when it is in use. 22 INTR_N OPU 23 NC NC 24 TXD4_1 IPD Pin Description 3.3V or 2.5V analog power No connect 4 RMII: Port 4 RMII transmit bit [1]. 25 LED3_1 IPU/O 3 Port 3 LED Indicator 1. See global Register 11 bits [5:4] for details. Strap option: Switch Port 5 GMAC5 interface mode select by LED3[1:0] 00 = MII for SW5-MII 01 = RMII for SW5-RMII 10 = Reserved 11 = RGMII for SW5-RGMII (default) 26 TXD4_0 IPD 4 RMII: Port 4 RMII transmit bit [0] 27 LED3_0 IPU/O 3 Port 3 LED Indicator 0. See global Register 11 bits [5:4] for details. Strap option: see LED3_1 28 VDD12D P 29 GNDD GND 2015 Microchip Technology Inc. 1.2V core power. Digital ground. DS00002129C-page 7