Micrel, Inc. KSZ8041NL
October 2006
9 M9999-102406-1.0
Pin Description
Pin Number Pin Name
Type
(1)
Pin Function
1 GND Gnd Ground
2 VDDPLL_1.8 P 1.8V analog V
DD
3 VDDA_3.3 P 3.3V analog V
DD
4 RX- I/O Physical receive or transmit signal (- differential)
5 RX+ I/O Physical receive or transmit signal (+ differential)
6 TX- I/O Physical transmit or receive signal (- differential)
7 TX+ I/O Physical transmit or receive signal (+ differential)
8 XO O Crystal feedback
This pin is used only in MII mode when a 25 MHz crystal is used.
This pin is a no connect if oscillator or external clock source is used, or if RMII
mode is selected.
9 XI /
REFCLK
I Crystal / Oscillator / External Clock Input
MII Mode: 25MHz +/-50ppm (crystal, oscillator, or external clock)
RMII Mode: 50MHz +/-50ppm (oscillator, or external clock only)
10 REXT I/O Set physical transmit output current
Pull-down this pin with a 6.49KΩ resistor to ground.
11 MDIO I/O Management Interface (MII) Data I/O
This pin requires an external 4.7KΩ 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]
(2)
/
Config Mode: The pull-up/pull-down value is latched as PHYADDR[0] during
power-up / reset. See “Strapping Options” section for details.
14 RXD2 /
PHYAD1
Ipd/O
MII Mode: Receive Data Output[2]
(2)
/
Config Mode: The pull-up/pull-down value is latched as PHYADDR[1] during
power-up / reset. See “Strapping Options” section for details.
15 RXD1 /
RXD[1] /
PHYAD2
Ipd/O
MII Mode: Receive Data Output[1]
(2)
/
RMII Mode: Receive Data Output[1]
(3)
/
Config Mode: The pull-up/pull-down value is latched as PHYADDR[2] during
power-up / reset. See “Strapping Options” section for details.
16 RXD0 /
RXD[0] /
DUPLEX
Ipu/O
MII Mode: Receive Data Output[0]
(2)
/
RMII Mode: Receive Data Output[0]
(3)
/
Config Mode: Latched as DUPLEX (register 0h, bit 8) during power-up /
reset. See “Strapping Options” section 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 / reset. See “Strapping Options” section for details.
19 RXC O MII Mode: Receive Clock Output
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