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

To: Tony Viola who wrote (33749)	11/3/1999 11:28:00 PM
From: Bilow	Read Replies (1) \| Respond to of 93625

Hi Tony Viola; The rambus data lines are bidirectional. They are series terminated at one end. The end chosen is the end on the opposite side of the controller. Probably the thing to remember, the thing that distinguishes RSL from ECL, is that RSL is a current logic system, and ECL is a voltage level logic system. That is, the RSL outputs are trimmed to a particular current, and that current induces a voltage on the line. The voltage is determined by the termination resistor. The arrival (and height) of the voltage level is determined by which end the termination is on, and whether the driver is in the middle of the bus (and hence sees half the usual bus impedance) or on the unterminated end (and hence sees the usual bus impedance). With ECL, the tradition is to series terminate at the driver, or parallel terminate at the load. RSL is using only parallel termination, and it is at the unused end of the bus. What happens when the bus is point to point bidirectional, I cannot tell. Wish the 82803 specs would release... By the way, I should probably mention that I don't have any position in RMBS, just a fascination with the technology. (No guts.) -- Carl