
Micrel, Inc.
KSZ8864RMN
April 2012
10
M9999-043012-1.5
Pin Description
Pin Number
Pin Name
Type
(1)
Port
Pin Function
(2)
1
RXP1
I
1
Physical receive signal + (differential).
2
RXM1
I
1
Physical receive signal – (differential).
3
TXP1
O
1
Physical transmit signal + (differential).
4
TXM1
O
1
Physical transmit signal – (differential).
5
VDDA12
P
1.2V analog power.
6
GND
Ground with all grounding of die bottom.
7
ISET
Set physical transmit output current. Pull-down with a 12.4k1%
resistor.
8
VDDAT
P
3.3V analog VDD.
9
RXP2
I
2
Physical receive signal + (differential).
10
RXM2
I
2
Physical receive signal - (differential).
11
TXP2
O
2
Physical transmit signal + (differential).
12
TXM2
O
2
Physical transmit signal – (differential).
13
VDDAT
P
3.3V analog VDD.
14
INTR_N
OPU
Interrupt. This pin is Open-Drain output pin.
15
VDDC
P
1.2V digital core VDD.
16
SM3TXEN
IPD
3
MAC3 Switch MII/RMII transmit enable.
17
SM3TXD3
IPD
3
MAC3 Switch MII transmit bit 3.
18
SM3TXD2
IPD
3
MAC3 Switch MII transmit bit 2.
19
SM3TXD1
IPD
3
MAC3 Switch MII/RMII transmit bit 1.
20
SM3TXD0
IPD
3
MAC3 Switch MII/RMII transmit bit 0.
21
SM3TXC/SM3REFCLK
I/O
3
MAC3 Switch MII transmit clock:
Input: SW3-MII MAC mode.
Output: SW3-MII PHY mode.
Input: SW3-RMII reference clock.
22
VDDIO
P
3.3V, 2.5V or 1.8V digital VDD for digital I/O circuitry.
23
SM3RXC
I/O
3
MAC3 Switch MII Receive clock:
Input: SW3-MII MAC mode.
Output: SW3-MII PHY mode.
Output: SW3-RMII reference clock.
Unused RMII clock can be pull-down or disable by register 87.
24
SM3RXDV/SM3CRSDV
IPD/O
3
SM3RXDV: MAC3 Switch SW3-MII receive data valid.
SM3CRSDV: MAC3 Switch SW3-RMII Carrier Sense/Receive Data
Valid.
25
SM3RXD3
IPD/O
3
MAC3 Switch MII receive bit 3.
Strap option:
PD (default) = enable flow control;
PU = disable flow control.