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KS8893ML Datasheet(PDF) 34 Page - Micrel Semiconductor |
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KS8893ML Datasheet(HTML) 34 Page - Micrel Semiconductor |
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34 / 106 page  Micrel KS8893M/ML/MI June 2005 34 M9999-063005 The KS8893M filters error frames, and thus does not implement the RX_ER output signal. To detect error frames from RMII PHY devices, the SMTXER input signal of the KS8893M is connected to the RXER output signal of the RMII PHY device. Collision detection is implemented in accordance with the RMII Specification. In RMII mode, tie MII signals, SMTXD[3:2] and SMTXER, to ground if they are not used. The KS8893M RMII can interface with RMII PHY and RMII MAC devices. The latter allows two KS8893M devices to be connected back-to-back. The following table shows the KS8893M RMII pin connections with an external RMII PHY and an external RMII MAC, such as another KS8893M device. KS8893M PHY-MAC Connections KS8893M MAC-MAC Connections External PHY Signals KS8893M MAC Signals Pin Descriptions KS8893M MAC Signals External MAC Signals REF_CLK REFCLK Reference Clock REFCLK REF_CLK TX_EN SMRXDV Carrier sense/ Receive data valid SMRXDV TX_EN TXD1 SMRXD[1] Receive data bit 1 SMRXD[1] TXD1 TXD0 SMRXD[0] Receive data bit 0 SMRXD[0] TXD0 CRS_DV SMTXEN Transmit enable SMTXEN CRS_DV RXD1 SMTXD[1] Transmit data bit 1 SMTXD[1] RXD1 RXD0 SMTXD[0] Transmit data bit 0 SMTXD[0] RXD0 RX_ER SMTXER Receive error (not used) (not used) Table 5: RMII Signal Connections SNI (7-Wire) Operation The serial network interface (SNI) or 7-wire is compatible with some controllers used for network layer protocol processing. In SNI mode, the KS8893M acts like a PHY and the external controller functions as the MAC. The KS8893M can interface directly with external controllers using the 7-wire interface. These signals are divided into two groups, one for transmission and the other for reception. The signals involved are described in the following table. Pin Descriptions External MAC Controller Signals KS8893M PHY Signals Transmit enable TXEN SMTXEN Serial transmit data TXD SMTXD[0] Transmit clock TXC SMTXC Collision detection COL SCOL Carrier sense CRS SMRXDV Serial receive data RXD SMRXD[0] Receive clock RXC SMRXC Table 6. SNI Signals |
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