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To: Tony Viola who wrote (33930)	11/4/1999 5:30:00 PM
From: John Walliker	Read Replies (1) \| Respond to of 93625

Tony, If the single terminator is at the end furthest away from the controller, there shouldn't be any reflection back at the source, unless the net is poor. When the controller is transmitting there is no (significant) reflection. The impedance seen by the controller is 28 ohms - the characteristic impedance of the transmission line. When a DRDRAM chip is transmitting it sees two transmission lines, one going towards the controller, one going away from it to the terminator. So it sees 14 ohms. The signal going towards the controller gets reflected at the open circuit end. At that point there is a superposition of the original signal and the reflected signal momentarily which doubles the voltage. As the voltage had been halved by sharing the drive current between two directions of the transmission line and doubled again by the reflection at the open end the result is the same signal level at the receiving circuits of the controller as that which is received by the memory chips from the controller. John