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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TLK111PT датащи(PDF) 21 Page - Texas Instruments |
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TLK111PT датащи(HTML) 21 Page - Texas Instruments |
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21 / 109 page  TX_CLK TX_EN TXD [3:0] RX_CLK RX_DV RX_ER RXD [3:0] CRS COL PHY MAC TX_CLK TX_EN TXD [3:0] RX_CLK RX_DV RX_ER RXD [3:0] CRS COL TLK111 www.ti.com SLLSEF8A – AUGUST 2013 – REVISED NOVEMBER 2013 4 Interfaces 4.1 Media Independent Interface (MII) The Media Independent Interface (MII) is a synchronous 4-bit wide nibble data interface that connects the PHY to the MAC in 100B-TX and 10B-T modes. The MII is fully compliant with IEEE802.3-2002 clause 22. The MII signals are summarized below. Data signals TXD [3:0] RXD [3:0] Transmit and receive-valid signals TX_EN RX_DV Line-status signals CRS (carrier sense) COL (collision) Figure 4-1 shows the MII-mode signals. Figure 4-1. MII Signaling The Isolate bit (BMCR register bit 10), defined in IEEE802.3-2002, electrically isolates the PHY from the MII (if set, all transactions on the MII interface are ignored by the PHY). Additionally, the MII interface includes the carrier sense signal CRS, as well as a collision detect signal COL. The CRS signal asserts to indicate the reception of data from the network or as a function of transmit data in Half Duplex mode. The COL signal asserts as an indication of a collision which can occur during half-duplex operation when both transmit and receive operation occur simultaneously. Copyright © 2013, Texas Instruments Incorporated Interfaces 21 Submit Documentation Feedback Product Folder Links: TLK111 |
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