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DM9801AE датащи(PDF) 10 Page - Davicom Semiconductor, Inc. |
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DM9801AE датащи(HTML) 10 Page - Davicom Semiconductor, Inc. |
10 / 60 page DM9801A 1M Home Phoneline Network Physical Layer Single Chip Transceiver 10 Final Version: DM9801A-DS-F01 May 30, 2001 Functional Description The DM9801A is a single-chip Home Phoneline Network transceiver .The DM9801A provides an IEEE 802.3u subset Media Independent Interface (MII) or a pseudo- standard General Purpose Serial Interface (GPSI). The DM9801A enables home networking by allowing Ethernet packets to be transported over common home telephone wiring with no modifications, using Ethernet CSMA/CD media access control procedures as defined in the IEEE 802.3 standard. Figure 1 shows the major functional blocks implemented in the DM9801A. Figure 1 MII Interface The DM9801A provides a subset Media Independent Interface (MII) or a pseudo-standard General Purpose Serial Interface (GPSI). The MII interface provides a simple, easy way to implement connection between the MAC Reconciliation layer and the DM9801A transceiver. The MII is designed to make the differences between various media transparent to the MAC sublayer. The MII consists of a nibble wide receive data bus, a nibble wide transmit data bus, and control signals to facilitate data transfers between the PHY and the Reconciliation layer. TXD (transmit data) is a nibble (4 bits) of data that are driven by the reconciliation sublayer synchronously with respect to TX_CLK. For each TX_CLK period, which TX_EN is asserted, TXD (3:0) are accepted for transmission by the PHY. TX_CLK (transmit clock) output to the MAC reconciliation sublayer is a clock that provides the timing reference for the transfer of the TX_EN, TXD, and TX_ER signals. TX_EN (transmit enable) input from the MAC reconciliation sublayer to indicate nibbles are being presented on the MII for transmission on the physical medium. Muxed GPSI or MII Interface RLL25 Encoder RLL25 Decoder Master PHY Controller Receiver and Digital PLL Receiver AFE HN Drivers Transmit Timing Generator |
Аналогичный номер детали - DM9801AE |
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Аналогичное описание - DM9801AE |
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