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Technology Stocks : Rambus (RMBS) - Eagle or Penguin -- Ignore unavailable to you. Want to Upgrade?

To: Bilow who wrote (72307)	5/9/2001 8:51:12 AM
From: gnuman	Read Replies (1) \| Respond to of 93625

Carl, re: RSL bus. My transmission line theory is rusty as heck. But I think you need to analyze the bus from the aspect of a current source. From what I've read, the RSL output sink's 30 ma from the bus. The bus is 28 Ohm's terminated in it's characteristic impedance at the far end. Anytime a "one" is invoked, the source initially sees Zo/2. (Irrespective of location since there is a distance from the source to the controller even on the near end). This generates a 0.4V voltage traveling in both directions on the bus. When the wave hits the controller it sees Zo and the voltage is doubled to 0.8V. When the return wave passes the source it adds to the 15 ma traveling towards the termination, so that the 30 ma source is constant, but the voltage has doubled in that direction. (The wave traveling in that direction sees Zo). If the far end source is enabled while the first signal is present, it sends 15ma in both directions. The wave in the direction of the controller subtracts 15 ma, so we now again have a 0.4V signal heading for the controller. Again, when it hits the controller the voltage is doubled and 15 ma is turned around towards the termination. (It sees Z0 again). I don't think the source has to turn itself "on or off" because of a wave passing it. Again, I haven't worked with strip line in many, many years, and I invite anyone to critique this. JMO's