TNETX4090
ThunderSWITCH II 9-PORT 100-/1000-MBIT/S ETHERNET SWITCH
SPWS044E ± DECEMBER 1997 ± REVISED AUGUST 1999
100-/1000-Mbit/s PHY interface (port 8)
This port is controlled by an IEEE Std
speed, duplex, and flow-control negotiation
When in PMA mode and autonegotiation is enabled, the
If manual override has been established, no autonegotiation takes place and the interface mode of operation is determined by the values in Port8Control.
The PCS layer may be forced to start autonegotiation by writing a 0 and then a 1 to the neg bit in Port8Control, but, alternatively, you could hit the newaneg bit in PCS8Control.
Figure 4 shows how the gigabit port on the TNETX4090 can be connected to a SERDES device. Table 1 gives a description of the device terminals.
M08_TXD0±M08_TXD7
M08_TXEN
M08_TXER
M08_EWRAP
M08_LINK
TNETX4090
Gigabit Port Terminals
M08_RXD0±M08_RXD7
M08_RXDV
M08_RXER
M08_LREF
M08_COL
M08_RCLK
M08_GTCLK
M08_RFCLK
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| TD0±TD7 |
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| TD8 |
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| TD9 |
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NC |
| SYNC |
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VCC |
| SYNCEN |
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| LOOPEN | DOUT_TXP |
| Serial Data |
Tie to Signal Detect Terminal of |
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| DOUT_TXN |
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Optical Receiver, SERDES Device, |
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or to VCC | TNETE2201 |
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| RD0±RD7 | DIN_RXP |
| Serial Data |
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| RD8 |
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| DIN_RXN |
| Input | |
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| RD9 |
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| LCKREFN |
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| RBC1 |
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| RBC0 |
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| RFCLK |
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NOTE: The SYNC output from the SERDES device is not used by the TNETX4090. The SYNCEN input on the SERDES device must be tied high (enabled) for proper operation. The M08_LINK terminal on the TNETX4090 must be tied to the signal detect terminal of an attached optical receiver or tied high if a comparable terminal is unavailable.
Figure 4. TNETX4090 Gigabit Port to SERDES Device Connections
36 | POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
