Datasheet
2017 Microchip Technology Inc. DS00002245B-page 7
KSZ8041NL/RNL
7 TX+ I/O Physical transmit or receive signal (+ differential)
8XOO
Crystal Feedback.
This pin is used only in MII mode when a 25-MHz crystal is used.
This pin is a no connect if an oscillator or an external clock source is
used, or if RMII mode is selected.
9
XI /
REFCLK
I
Crystal/Oscillator/External Clock Input:
MII mode: 25 MHz ±50 ppm (crystal, oscillator, or external clock)
RMII mode: 50 MHz ±50 ppm (oscillator or external clock only)
10 REXT I/O
Set physical transmit output current.
Connect a 6.49-K resistor in parallel with a 100-pF capacitor to
ground on this pin.
11 MDIO I/O
Management Interface (MII) Data I/O
This pin requires an external 4.7-K pull-up resistor.
12 MDC I
Management Interface (MII) Clock Input
This pin is synchronous to the MDIO data interface.
13
RXD3 /
PHYAD0
Ipu/O
MII mode: Receive Data Output[3] (Note 2-2)
Config mode: The pull-up/pull-down value is latched as PHY-
ADDR[0] during power-up or reset. See “Strap-In option –
KSZ8041NL” for details.
14
RXD2 /
PHYAD1
Ipd/O
MII mode: Receive Data Output[2] (Note 2-2)
Config mode: The pull-up/pull-down value is latched as PHY-
ADDR[1] during power-up or reset. See “Strap-In option –
KSZ8041NL” for details.
15
RXD1 /
RXD[1] /
PHYAD2
Ipd/O
MII mode: Receive Data Output[1] (Note 2-2)
RMII mode: Receive Data Output[1] (Note 2-3)
Config mode: The pull-up/pull-down value is latched as PHY-
ADDR[2] during power-up or reset. See “Strap-In option –
KSZ8041NL” for details.
16
RXD0 /
RXD[0] /
DUPLEX
Ipu/O
MII mode: Receive Data Output[0] (Note 2-2).
RMII mode: Receive Data Output[0] (Note 2-3).
Config mode: Latched as DUPLEX (register 0h, bit 8) during power-
up or reset. See “Strap-In option – KSZ8041NL” for details.
17 VDDIO_3.3 P
3.3V Digital V
DD
18
RXDV /
CRSDV /
CONFIG2
Ipd/O
MII mode: Receive Data Valid Output
RMII mode: Carrier Sense/Receive Data Valid Output
Config mode: The pull-up/pull-down value is latched as CONFIG2
during power-up or reset. See “Strap-In option – KSZ8041NL”
for details.
19 RXC O
MII mode: Receive Clock Output
20
RXER /
RX_ER /
ISO
Ipd/O
MII mode: Receive Error Output
RMII mode: Receive Error Output
Config mode: The pull-up/pull-down value is latched as ISOLATE
during power-up or reset. See “Strap-In option – KSZ8041NL” for
details.
TABLE 2-1: KSZ8041NL PIN DESCRIPTION (CONTINUED)
Pin Number Symbol
Buffer Type
(Note 2-1)
Description