KSZ8864RMNI MICREL [Micrel Semiconductor], KSZ8864RMNI Datasheet - Page 35

• 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
Note:
1.
2.
KSZ8864RMN provides two RMII interfaces for MAC3 and MAC4:


REF_CLK
CRS_DV
External
TX_EN
RXD1
RXD0
Used)
TXD1
TXD0
MAC
(Not
‘x’ is 3 or 4 for SW3 or SW4 in the table.
MAC/PHY mode in RMII is difference with MAC/PHY mode in MII, there is no strap pin and register configuration request in RMII, just follow
the signals connection in the table.
Switch MAC4 SW4-RMII interface can be used to provide 50MHz clock to opposite RMII from SM4RXC pin with
loop back to SM4TXC pin. The SW4-RMII interface can be used to accept 50MHz from external 50MHz clock to
SM4TXC when KSZ8864RMN is configured to normal mode by the strap pin P1LED1 pull-down. In the normal
mode, the clock source of the KSZ8864RMN comes from the SM4TXC.
Switch MAC3 SW3-RMII interface can be used to provide 50MHz clock to opposite RMII from SM3RXC pin with
loop back to SM3TXC pin. The SW3-RMII interface can not be used to accept 50MHz from external to SM3TXC
with the normal mode configuration.

SW3/4-RMII MAC to MAC Connection
KSZ8864RMN
/SMxREFCLK
/SMxCRSDV
SMxRXD[1]
SMxRXD[0]
SMxTXD[1]
SMxTXD[0]
SMxRXDV
(Not Used)
SMxTXEN
SMxRXC
SMxTXC
Signal
(“PHY” Mode)
Table 4. MAC3 SW3-RMII and MAC4 SW4-RMII Connection
KSZ8864RMN SW
(Clock comes from
SMxRXC in clock
mode or external
50MHz clock)
Signal Type
(Clock mode
with 50MHz)
Output
Output
Output
Output
Input
Input
Input
Input
Sense/Receive
Transmit Data
Description
Reference
Data Valid
Reference
Data Bit 1
Data Bit 0
Data Bit 1
Transmit
Transmit
Receive
Receive
Receive
Carrier
Enable
Clock
Clock
Error
Data
Bit 0
35
(Not Used)
REF_CLK
External
CRS_DV
TX_EN
RXD1
RXD0
TXD1
TXD0
PHY

SW3/4-RMII MAC to PHY Connection
KSZ8864RMN
/SMxREFCLK
/SMxCRSDV
SMxRXD[1]
SMxRXD[0]
SMxTXD[1]
SMxTXD[0]
SMxRXDV
SMxTXEN
(not used)
SMxRXC
SMxTXC
(“MAC” Mode)
Signal
KSZ8864RMN SW
(Clock comes from
M9999-092011-1.4
SMxRXC in clock
mode or external
50MHz clock)
with 50MHz )
Signal Type
(Clock mode
Output
Output
Output
Output
Input
Input
Input
Input