KSZ8041NL/RNL
TABLE 2-1:
Pin Number
KSZ8041NL PIN DESCRIPTION (CONTINUED)
Buffer Type
Symbol
Description
(Note 2-1)
7
8
TX+
XO
I/O
Physical transmit or receive signal (+ differential)
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.
O
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)
XI /
REFCLK
9
I
Set physical transmit output current.
Connect a 6.49-K resistor in parallel with a 100-pF capacitor to
ground on this pin.
10
REXT
I/O
Management Interface (MII) Data I/O
This pin requires an external 4.7-K pull-up resistor.
11
12
MDIO
MDC
I/O
I
Management Interface (MII) Clock Input
This pin is synchronous to the MDIO data interface.
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.
RXD3 /
PHYAD0
13
14
Ipu/O
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.
RXD2 /
PHYAD1
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.
RXD1 /
RXD[1] /
PHYAD2
15
Ipd/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.
RXD0 /
RXD[0] /
DUPLEX
16
17
Ipu/O
P
3.3V Digital VDD
VDDIO_3.3
MII mode: Receive Data Valid Output
RXDV /
CRSDV /
CONFIG2
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”
18
19
20
Ipd/O
O
for details.
MII mode: Receive Clock Output
RXC
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.
RXER /
RX_ER /
ISO
Ipd/O
2017 Microchip Technology Inc.
DS00002245B-page 7
MICROCHIP [ MICROCHIP ]
