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
Terminal Functions (Continued)
TERMINAL |
| I/O | INTERNAL | DESCRIPTION | |
NAME | NO. | RESISTOR | |||
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TH0TXD3 | 218 |
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TH0TXD2 | 217 |
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TH0TXD1 | 216 |
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TH0TXD0 | 215 |
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TH1TXD3 | 239 |
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| Interface transmit data. The transmit data nibble for the current port is synchronous to | |
TH1TXD2 | 237 | O | None | THxCLK. When THxTXEN is asserted, these signals carry data. THxTXD3±THxTXD0 are | |
TH1TXD1 | 236 | used during renegotiation to convey | |||
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TH1TXD0 | 234 |
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| PHY. THxTXD0 is the least significant bit and THxTXD3 is the most significant bit. | |
TH2TXD3 | 20 |
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TH2TXD2 | 19 |
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TH2TXD1 | 18 |
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TH2TXD0 | 16 |
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TH0RXDV | 226 |
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| Interface receive data valid. When THxRXDV is a 1, it indicates that the THxRXD lines contain | |
TH1RXDV | 6 | I | Pulldown | ||
valid data. | |||||
TH2RXDV | 26 |
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² THx = TH0, TH1, and TH2
10-/100-Mbit/s MAC interface (ports 24±26)³
| TERMINAL |
| I/O | INTERNAL | DESCRIPTION |
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| NAME | NO. | RESISTOR |
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| M24COL | 42 |
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| Collision sense. Assertion of MxxCOL in | |||
| M25COL | 65 | I | Pulldown | on that port. In | |||
| M26COL | 90 |
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| terminal is asserted. |
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| M24CRS | 43 |
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| M25CRS | 66 | I | Pulldown | Carrier sense. MxxCRS indicates a frame carrier signal is being received. | |||
| M26CRS | 92 |
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| Speed selection (force 10 Mbit/s is active low) |
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| 54 |
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| M24FORCE10 |
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| I/O§ |
| ± If pulled low by either the TNETX3270 or a PHY, the port operates at 10 Mbit/s. | ||
| M25FORCE10 | 80 | Pullup | ± If not pulled low by either the TNETX3270 or a PHY, the internal pullup resistor holds | ||||
| M26FORCE10 | 104 |
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| Ω | pullup resistor | ||
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| this signal high and the port operates at 100 Mbit/s. An external | ||||
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| connected to VDD(3.3V) may be required, depending on the system layout. | |
| M24LINK | 52 |
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| Connection status. MxxLINK indicates the presence of a port connection. |
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| M25LINK | 78 | I | Pulldown | ± If MxxLINK = 0, there is no link. |
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| M26LINK | 102 |
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| ± If MxxLINK = 1, the link is good. |
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| Duplex selection (force half duplex is active low) |
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| 53 |
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| M24FORCEHD |
| I/O³ |
| ± If pulled low by either the TNETX3270 or the PHY, the port operates at half duplex. | |||
| M25FORCEHD | 79 | Pullup | ± If not pulled low by either the TNETX3270 or the PHY, the internal pullup resistor holds | ||||
| M26FORCEHD | 103 |
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| Ω | pullup resistor | ||
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| this signal high and the port operates at full duplex. An external | ||||
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| connected to VDD(3.3V) may be required, depending on the system layout. | |
| M24RCLK | 44 |
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| M25RCLK | 67 | I | Pullup | Receive clock. Receive clock source from the attached PHY or PMI device. | |||
| M26RCLK | 93 |
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³xx = ports 24, 25, and 26
§ Not a true bidirectional terminal. It can only be actively pulled down (open drain).
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 | 7 |
