Datasheet

KSZ8081MNX/RNB
DS00002202C-page 8 2016-2018 Microchip Technology Inc.
Note 2-1 P = Power supply.
GND = Ground.
I = Input.
O = Output.
I/O = Bi-directional.
Ipu = Input with internal pull-up (see Electrical Characteristics for value).
Ipu/O = Input with internal pull-up (see Electrical Characteristics for value) during power-up/reset;
output pin otherwise.
Ipd/O = Input with internal pull-down (see Electrical Characteristics for value) during power-up/reset;
output pin otherwise.
Ipu/Opu = Input with internal pull-up (see Electrical Characteristics for value) and output with internal
pull-up (see Electrical Characteristics for value).
NC = Pin is not bonded to the die.
Note 2-2 RMII RX Mode: The RXD[1:0] bits are synchronous with the 50 MHz RMII Reference Clock. For each
clock period in which CRS_DV is asserted, two bits of recovered data are sent by the PHY to the
MAC.
Note 2-3 RMII TX Mode: The TXD[1:0] bits are synchronous with the 50 MHz RMII Reference Clock. For each
clock period in which TXEN is asserted, two bits of data are received by the PHY from the MAC.
Note 2-4 MII TX Mode: The TXD[3:0] bits are synchronous with TXC. When TXEN is asserted, TXD[3:0]
presents valid data from the MAC. TXD[3:0] has no effect on the PHY when TXEN is de-asserted.
31
LED1/
SPEED
Ipu/O
LED Output: Programmable LED1 Output.
Config Mode: Latched as Speed (Register 0h, Bit [13]) at the de-
assertion of reset.
See the Strap-In Options – KSZ8081MNX section for details.
The LED1 pin is programmable using Register 1Fh bits [5:4], and is
defined as follows:
:
LED Mode = [10], [11]Reserved
32 RST# Ipu Chip Reset (active low).
PADDLE GND GND Ground.
TABLE 2-1: PIN DESCRIPTION — KSZ8081MNX (CONTINUED)
Pin
Number
Name
Buffer
Type
(Note 2-1)
Description
LED Mode = [00]
Speed Pin State LED Definition
10Base-T High OFF
100Base-TX Low ON
LED Mode = [01]
Activity Pin State LED Definition
No activity High OFF
Activity Toggle Blinking