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KS8995MAI Datasheet(PDF) 30 Page - Micrel Semiconductor |
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KS8995MAI Datasheet(HTML) 30 Page - Micrel Semiconductor |
30 / 79 page 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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