KSZ8895 INFINEON [Infineon Technologies AG], KSZ8895 Datasheet - Page 38

• Manufacturer Part Number: KSZ8895
• Description: Integrated 5-Port 10/100 Managed Ethernet Switch with MII/RMII interface
• Manufacturer: INFINEON [Infineon Technologies AG]

Micrel, Inc.
Port 5 MAC 5 SW5-MII Interface for the KSZ8895MQ/FMQ
Table 4 shows two connection manners,
Please see the pins [91,86,87] description for detail configuration for the MAC mode and PHY mode, SW5-MII works
with 25MHz clock for 100Base-TX, SW5-MII works with 2.5MHz clock for 10Base-T.
The switch MII interface operates in either MAC mode or PHY mode for KSZ8895MQ/RQ/FMQ. These interfaces are
nibble-wide data interfaces and therefore run at one-quarter the network bit rate (not encoded). Additional signals on
the transmit side indicate when data is valid or when an error occurs during transmission. Likewise, the receive side
has indicators that convey when the data is valid and without physical layer errors. For half-duplex operation, there is
a signal that indicates a collision has occurred during transmission.
Note that the signal MRXER is not provided on the MII-SW interface for PHY mode operation and the signal MTXER
is not provided on the SW-MII interface for MAC mode operation. Normally MRXER would indicate a receive error
coming from the physical layer device. MTXER would indicate a transmit error from the MAC device. These signals
are not appropriate for this configuration. For PHY mode operation with an external MAC, if the device interfacing
with the KSZ8895MQ/RQ/FMQ has an MRXER pin, it should be tied low. For MAC mode operation with an external
January 2011
1. The first is an external MAC connects to SW5-MII PHY mode.
2. The second is an external PHY connects to SW5-MII MAC mode.
External
MRXDV
MRXER
MTXEN
MTXER
MRXD3
MRXD2
MRXD1
MRXD0
MTXD3
MTXD2
MTXD1
MTXD0
MCRS
MRXC
MTXC
MCOL
MAC
KSZ8895MQ/RQ/FMQ PHY Mode
KSZ8895MQ/RQ/FMQ
SW5-MII Signals
Connection
SMRXD[3]
SMRXD[2]
SMRXD[1]
SMRXD[0]
SMTXD[3]
SMTXD[2]
SMTXD[1]
SMTXD[0]
SMRXDV
SMTXEN
SMTXER
Not used
SMTXC
SMRXC
SCOL
SCRS
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Table 4. Switch MAC5 MII Signals
Type
Input
Input
Input
Input
Input
Input
Transmit enable
Receive data bit
Receive data bit
Receive data bit
Receive data bit
Transmit clock
Transmit error
Transmit data
Transmit data
Transmit data
Transmit data
Receive clock
Carrier sense
Receive error
Receive data
Description
detection
Collision
valid
bit 3
bit 2
bit 1
bit 0
3
2
1
0
38
External
MRXDV
MRXER
MTXEN
MTXER
MRXD3
MRXD2
MRXD1
MRXD0
MTXD3
MTXD2
MTXD1
MTXD0
MCOL
MCRS
MRXC
MTXC
PHY
KSZ8895MQ/RQ/FMQ MAC Mode
KSZ8895MQ/RQ/FMQ
SW5-MII Signals
Connection
SMRXD[3]
SMRXD[2]
SMRXD[1]
SMRXD[0]
SMTXD[3]
SMTXD[2]
SMTXD[1]
SMTXD[0]
SMRXDV
SMTXEN
SMTXER
Not used
SMRXC
SMTXC
SCOL
SCRS
KSZ8895MQ/RQ/FMQ
Output
Output
Output
Output
Output
M9999-012011-1.2
Type
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
used
Not