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TNETX3270 数据表(PDF) 7 Page - Texas Instruments |
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TNETX3270 数据表(HTML) 7 Page - Texas Instruments |
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7 / 66 page  TNETX3270 ThunderSWITCH ™ 24/3 ETHERNET™ SWITCH WITH 24 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS SPWS043B – NOVEMBER 1997 – REVISED APRIL 1999 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (Continued) 10-Mbit/s MAC multiplexed interface (ports 00–23) is multiplexed into three groups (TH0, TH1, and TH2) of eight ports† (continued) TERMINAL I/O INTERNAL DESCRIPTION NAME NO. I/O RESISTOR DESCRIPTION TH0TXD3 TH0TXD2 TH0TXD1 TH0TXD0 TH1TXD3 TH1TXD2 TH1TXD1 TH1TXD0 TH2TXD3 TH2TXD2 TH2TXD1 TH2TXD0 218 217 216 215 239 237 236 234 20 19 18 16 O None Interface transmit data. The transmit data nibble for the current port is synchronous to THxCLK. When THxTXEN is asserted, these signals carry data. THxTXD3–THxTXD0 are used during renegotiation to convey flow-control and duplex configuration requests to the PHY. THxTXD0 is the least significant bit and THxTXD3 is the most significant bit. TH0RXDV TH1RXDV TH2RXDV 226 6 26 I Pulldown Interface receive data valid. When THxRXDV is a 1, it indicates that the THxRXD lines contain valid data. † THx = TH0, TH1, and TH2 10-/100-Mbit/s MAC interface (ports 24–26)‡ TERMINAL I/O INTERNAL DESCRIPTION NAME NO. I/O RESISTOR DESCRIPTION M24COL M25COL M26COL 42 65 90 I Pulldown Collision sense. Assertion of MxxCOL in half-duplex signal indicates a network collision on that port. In full-duplex operation, transmission of new frames does not start if this terminal is asserted. M24CRS M25CRS M26CRS 43 66 92 I Pulldown Carrier sense. MxxCRS indicates a frame carrier signal is being received. M24FORCE10 M25FORCE10 M26FORCE10 54 80 104 I/O§ Pullup Speed selection (force 10 Mbit/s is active low) – If pulled low by either the TNETX3270 or a PHY, the port operates at 10 Mbit/s. – If not pulled low by either the TNETX3270 or a PHY, the internal pullup resistor holds this signal high and the port operates at 100 Mbit/s. An external 4.7-k Ω pullup resistor connected to VDD(3.3V) may be required, depending on the system layout. M24LINK M25LINK M26LINK 52 78 102 I Pulldown Connection status. MxxLINK indicates the presence of a port connection. – If MxxLINK = 0, there is no link. – If MxxLINK = 1, the link is good. M24FORCEHD M25FORCEHD M26FORCEHD 53 79 103 I/O‡ Pullup Duplex selection (force half duplex is active low) – If pulled low by either the TNETX3270 or the PHY, the port operates at half duplex. – If not pulled low by either the TNETX3270 or the PHY, the internal pullup resistor holds this signal high and the port operates at full duplex. An external 4.7-k Ω pullup resistor connected to VDD(3.3V) may be required, depending on the system layout. M24RCLK M25RCLK M26RCLK 44 67 93 I Pullup Receive clock. Receive clock source from the attached PHY or PMI device. ‡ xx = ports 24, 25, and 26 § Not a true bidirectional terminal. It can only be actively pulled down (open drain). |
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