KSZ8864RMNI MICREL [Micrel Semiconductor], KSZ8864RMNI Datasheet - Page 15

• Manufacturer Part Number: KSZ8864RMNI
• Description: Integrated 4-Port 10/100 Managed Switch with Two MACs MII or RMII Interfaces
• Manufacturer: MICREL [Micrel Semiconductor]

September 2011
Pin Number
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
SM4RXDV/SM4CRSDV
SM4TXC/SM4REFCLK
SM3RXD2
SM3RXD1
SM3RXD0
SM4TXEN
Pin Name
SM4TXD3
SM4TXD2
SM4TXD1
SM4TXD0
SM3CRS
SM3COL
SM4RXC
VDDIO
GND
Type
IPD/O
IPD/O
IPD/O
IPD/O
IPD/O
IPD/O
GND
IPD
IPD
IPD
IPD
IPD
I/O
I/O
P
(1)
Port
3
3
3
3
3
4
4
4
4
4
4
4
4
Pin Function
MAC3 Switch MII receive bit 2 and Strap option:
PD (default) = disable back pressure;
PU = enable back pressure.
MAC3 Switch MII/RMII receive bit 1.
Strap option:
PD (default) = drop excessive collision packets;
PU = does not drop excessive collision packets.
MAC3 Switch MII/RMII receive bit 0.
Strap option:
PD (default) = disable aggressive back-off algorithm in half-
duplex mode;
PU = enable for performance enhancement.
MAC3 Switch MII carrier sense.
Ground with all grounding of die bottom.
MAC3 Switch MII collision detect.
MAC4 Switch MII/RMII transmit enable.
MAC4 Switch MII transmit bit 3.
MAC4 Switch MII transmit bit 2.
MAC4 Switch MII/RMII transmit bit 1.
MAC4 Switch MII/RMII transmit bit 0.
MAC4 Switch MII transmit clock:
Input: SW4-MII MAC mode clock.
Input: SW4-RMII reference clock, please also see the strap-in
pin P1LED1 for the clock mode and normal mode.
Output: SW4-MII PHY modes.
3.3V, 2.5V or 1.8V digital V
MAC4 Switch MII Receive clock:
Input: SW4-MII MAC mode.
Output: SW4-MII PHY mode.
Output: SW4-RMII 50MHz reference clock (the device is
default clock mode, the clock source comes from X1/X2 pins
25MHz crystal).
When set the device as normal mode (the chip’s clock source
comes from SM4TXC), the SM4RXC reference clock output
should be disabled by the register 87. Please also see the
strap-in pin P1LED1 for the selection of the clock mode and
normal mode.
SM4RXDV: MAC4 Switch SW4-MII receive data valid.
SM4CRSDV: MAC4 Switch SW4-RMII Carrier Sense/Receive
Data Valid
15
(2)
DD
for digital I/O circuitry.
M9999-092011-1.4