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KS8995MAI Datasheet(PDF) 30 Page - Micrel Semiconductor

Part # KS8995MAI
Description  Integrated 5-Port 10/100 Managed Switch
Download  79 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

KS8995MAI Datasheet(HTML) 30 Page - Micrel Semiconductor

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Micrel, Inc.
KS8995MA/FQ
Semptember 2008
30
M9999-091508
The table 2 shows three connection ways,
1. The first and second columns show the connections for external MAC and MII-SW PHY mode.
2. The fourth and fifth columns show the connections for external PHY and MII-SW MAC mode.
3. The second and fifth columns show the back to back connections for two MII-SWs of two devices.
PHY Mode Connection
MAC Mode Connection
External MAC
KS8995MA/FQ
Signal
Description
External PHY
KS8995MA Only
Signal
MTXEN
SMTXEN
Transmit enable
MTXEN
SMRXDV
MTXER
SMTXER
Transmit error
MTXER
Not used
MTXD3
SMTXD[3]
Transmit data bit 3
MTXD3
SMRXD[3]
MTXD2
SMTXD[2]
Transmit data bit 2
MTXD2
SMRXD[2]
MTXD1
SMTXD[1]
Transmit data bit 1
MTXD1
SMRXD[1]
MTXD0
SMTXD[0]
Transmit data bit 0
MTXD0
SMRXD[0]
MTXC
SMTXC
Transmit clock
MTXC
SMRXC
MCOL
SCOL
Collision detection
MCOL
SCOL
MCRS
SCRS
Carrier sense
MCRS
SCRS
MRXDV
SMRXDV
Receive data valid
MRXDV
SMTXEN
MRXER
Not used
Receive error
MRXER
SMTXER
MRXD3
SMRXD[3]
Receive data bit 3
MRXD3
SMTXD[3]
MRXD2
SMRXD[2]
Receive data bit 2
MRXD2
SMTXD[2]
MRXD1
SMRXD[1]
Receive data bit 1
MRXD1
SMTXD[1]
MRXD0
SMRXD[0]
Receive data bit 0
MRXD0
SMTXD[0]
MRXC
SMRXC
Receive clock
MRXC
SMTXC
Table 2. MII – SW Signals
The MII-P5 interface operates in PHY mode only, while the MII-SW interface operates in either MAC mode or PHY
mode for KSZ8995MA. The MII-SW interface operates in PHY mode only for KSZ8995FQ. These interfaces are
nibble-wide data interfaces and therefore run at 1/4 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 MII-SW 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, if the device interfacing with the KS8995MA/FQ
has an MRXER pin, it should be tied low. For MAC mode operation, if the device interfacing with the KS8995MA has
an MTXER pin, it should be tied low.


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