Micrel, Inc.
KSZ8041NL
Type(1)
Ipd/O
Pin Number
Pin Name
Pin Function
20
RXER /
RX_ER /
ISO
MII Mode:
Receive Error Output /
Receive Error Output /
RMII Mode:
Config Mode:
The pull-up/pull-down value is latched as ISOLATE during
power-up / reset. See “Strapping Options” section for details.
21
INTRP
Opu
Interrupt Output: Programmable Interrupt Output
Register 1Bh is the Interrupt Control/Status Register for programming the interrupt
conditions and reading the interrupt status. Register 1Fh bit 9 sets the interrupt
output to active low (default) or active high.
22
23
TXC
O
I
MII Mode:
MII Mode:
RMII Mode:
Transmit Clock Output
Transmit Enable Input /
Transmit Enable Input
TXEN /
TX_EN
TXD0 /
TXD[0]
MII Mode:
RMII Mode:
MII Mode:
RMII Mode:
MII Mode:
Transmit Data Input[0](4)
Transmit Data Input[0](5)
Transmit Data Input[1](4)
Transmit Data Input[1](5)
Transmit Data Input[2](4)
Transmit Data Input[3](4)
Collision Detect Output /
/
/
24
25
I
I
TXD1 /
TXD[1]
26
27
28
TXD2
TXD3
I
/
/
I
MII Mode:
COL /
Ipd/O
MII Mode:
CONFIG0
Config Mode:
The pull-up/pull-down value is latched as CONFIG0 during
power-up / reset. See “Strapping Options” section for details.
29
30
CRS /
Ipd/O
Ipu/O
MII Mode:
Carrier Sense Output /
CONFIG1
Config Mode:
The pull-up/pull-down value is latched as CONFIG1 during
power-up / reset. See “Strapping Options” section for details.
LED0 /
LED Output:
Config Mode:
Programmable LED0 Output /
NWAYEN
Latched as Auto-Negotiation Enable (register 0h, bit 12) during
power-up / reset. See “Strapping Options” section for details.
The LED0 pin is programmable via register 1Eh bits [15:14], and is defined as
follows.
LED mode = [00]
Link/Activity
No Link
Link
Pin State
LED Definition
OFF
H
L
ON
Activity
Toggle
Blinking
LED mode = [01]
Link
Pin State
LED Definition
No Link
Link
H
L
OFF
ON
LED mode = [10]
Reserved
LED mode = [11]
Reserved
July 2008
10
M9999-071808-1.2
MICROCHIP [ MICROCHIP ]
