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KS8893ML Datasheet(PDF) 32 Page - Micrel Semiconductor |
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KS8893ML Datasheet(HTML) 32 Page - Micrel Semiconductor |
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32 / 106 page  Micrel KS8893M/ML/MI June 2005 32 M9999-063005 reactivated again until switch resources free up. If a collision occurs, the binary exponential back-off algorithm is skipped and carrier sense is generated immediately, thus reducing the chance of further collisions and carrier sense is maintained to prevent packet reception. To ensure no packet loss in 10 BASE-T or 100 BASE-TX half duplex modes, the user must enable the following: 1. Aggressive back-off (register 3 (0x03), bit [0]) 2. No excessive collision drop (register 4 (0x04), bit [3]) Note: These bits are not set as defaults as this is not the IEEE standard. Broadcast Storm Protection The KS8893M has an intelligent option to protect the switch system from receiving too many broadcast packets. As the broadcast packets are forwarded to all ports except the source port, an excessive number of switch resources (bandwidth and available space in transmit queues) may be utilized. The KS8893M has the option to include “multicast packets” for storm control. The broadcast storm rate parameters are programmed globally, and can be enabled or disabled on a per port basis. The rate is based on a 67ms interval for 100BT and a 500ms interval for 10BT. At the beginning of each interval, the counter is cleared to zero, and the rate limit mechanism starts to count the number of bytes during the interval. The rate definition is described in register 6 (0x06) and 7 (0x07). The default setting is 0x63 (99 decimal). This is equal to a rate of 1%, calculated as follows: 148,800 frames/sec * 67ms/interval * 1% = 99 frames/interval (approx.) = 0x63 Note: 148,800 frames/sec is based on 64-byte block of packets in 100BASE-TX with 12 bytes of IPG and 8 bytes of preamble between two packets. MII Interface Operation The Media Independent Interface (MII) is specified in Clause 22 of the IEEE 802.3u Standard. It provides a common interface between physical layer and MAC layer devices. The MII provided by the KS8893M is connected to the device’s third MAC. The interface contains two distinct groups of signals: one for transmission and the other for reception. The following table describes the signals used by the MII bus. KS8893M PHY-Mode Connections KS8893M MAC-Mode Connections External MAC Controller Signals KS8893M PHY Signals Pin Descriptions External PHY Signals KS8893M MAC Signals 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 3. MII Signals |
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