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TNETX4090 Datasheet(PDF) 8 Page - Texas Instruments |
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TNETX4090 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 78 page  TNETX4090 ThunderSWITCH II™ 9-PORT 100-/1000-MBIT/S ETHERNET™ SWITCH SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (Continued) 100-/1000-Mbit/s MAC interface (GMII 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 Transmit clock. Transmit clock output to attached physical layer (PHY) device. 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. M08_RFCLK I Pullup Reference clock. Reference clock, used as the clock source for the transmit side of this port and to generate M08_GTCLK. M08_RXD7 M08_RXD6 M08_RXD5 M08_RXD4 M08_RXD3 M08_RXD2 M08_RXD1 M08_RXD0 I Pullup Receive data. Byte receive data from the attached PHY. 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_RXD7–M08_RXD0 is valid. This signal is synchronous to M08_RCLK. M08_RXER I Pulldown Receive error. M08_RXER indicates reception of a coding error on received data. M08_TXD7 M08_TXD6 M08_TXD5 M08_TXD4 M08_TXD3 M08_TXD2 M08_TXD1 M08_TXD0 O None Transmit data. Byte transmit data. When M08_TXEN is asserted, these signals carry transmit data. Data on these signals is synchronous to M08_GTCLK. M08_TXEN O None Transmit enable. M08_TXEN indicates valid transmit data on M08_TXD7–M08_TXD0. This signal is synchronous to M08_GTCLK. M08_TXER O None Transmit error. M08_TXER allows coding errors to be propagated between the media-access control (MAC) and the attached PHY. It is asserted at the end of an under-running frame, enabling the device to force a coding error. † Internal resistors are provided to pull signals to known values. The system designers should determine if additional pullups or pulldowns are required in their systems. |
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