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TNETX4090GGP 数据表(PDF) 10 Page - Texas Instruments |
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TNETX4090GGP 数据表(HTML) 10 Page - Texas Instruments |
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10 / 78 page  TNETX4090 ThunderSWITCH II™ 9-PORT 100-/1000-MBIT/S ETHERNET™ SWITCH SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (Continued) 100-/1000-Mbit/s MAC interface [media-independent interface (MII) mode] TERMINAL NAME I/O INTERNAL RESISTOR DESCRIPTION M08_COL I Pulldown Collision sense. Assertion of M08_COL during half-duplex operation indicates network collision. Additionally, during full-duplex operation, transmission of new frames does not commence if this terminal is asserted. M08_CRS I Pulldown Carrier sense. M08_CRS indicates a frame carrier signal is being received. M08_EWRAP O None Enable wrap. M08_EWRAP reflects the state of the loopback bit in the PCS8Control register. M08_GTCLK O None Unused. This terminal can be left unconnected. M08_LINK I Pulldown Connection status. M08_LINK indicates the presence of port connection. – If M08_LINK = 0, there is no link. – If M08_LINK = 1, the link is OK. M08_LREF O None Renegotiate. M08_LREF indicates to the attached PHY device that this device wishes to negotiate a new configuration. – Following a 0-to-1 transition of neg in PortxControl, M08_LREF is asserted low, and remains low until M08_LINK goes low. If M08_LINK was already low, M08_LREF is still activated for at least one cycle. – M08_LREF is asserted low for as long as initd in SysControl = 0, regardless of the state of M08_LINK. M08_RCLK I Pullup Receive clock. Receive clock source from the attached PHY or PMI device. M08_RFCLK I Pullup Transmit clock. Transmit clock from the attached PHY or PMI device. M08_RXD7 M08_RXD6 I Pullup Unused. These terminals can be left unconnected. M08_RXD5 I/O† Pullup IEEE Std 802.3x pause frame support selection – If pulled low either internally or by the attached PHY or PMI device, M08_RXD5 causes the port to not support pause frames. – If not pulled low, the port does not support pause frames. M08_RXD4 I/O† Pullup Duplex selection [force half duplex (active low)] – If pulled low either internally or by the attached PHY or PMI device, the port operates in half-duplex mode. – If not pulled low, the port operates in full-duplex mode. M08_RXD3 M08_RXD2 M08_RXD1 M08_RXD0 I Pullup Receive data. Nibble-wide receive data from the attached PHY or PMI device. When M08_RXDV is asserted, these signals carry receive data. Data on these signals is synchronous to M08_RCLK. M08_RXDV I Pulldown Receive data valid. M08_RXDV indicates data on M08_RXD3–M08_RXD0 is valid. This signal is synchronous to M08_RCLK. M08_RXER I Pulldown Receive error. Indicates reception of a coding error on received data. M08_TXD7 M08_TXD6 M08_TXD5 M08_TXD4 O None Unused. These terminals can be left unconnected, but are driven low. M08_TXD3 M08_TXD2 M08_TXD1 M08_TXD0 O None Transmit data. Nibble-wide transmit data. When M08_TXEN is asserted, these signals carry transmit data. Data on these signals is synchronous to M08_RFCLK. † Not a true bidirectional terminal. It can only be actively pulled down. |
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