Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 90.19

+2.8%

Nov 19 3:59 PM EST

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To: John Walliker who wrote (29330)	9/12/1999 2:44:00 PM
From: kash johal	Read Replies (1) of 93625

John, Re:"2. And you grossly misinterpret the power consumption of the I/O portion of DDR-DRAM I also calculated the supply current assuming no use of NAP mode - look again at my posting. Please show me how I should have calculated the power consumption. I assumed that logic 1s and 0s would have equal probability. That the RSL logic 1 current is about 30mA (based on the signalling level and bus impedance). That logic 0 current is zero. What is wrong with this?" The error is in assuming that DDR-SDRAMs consumption is similar to RDRAM. DDR-SDRAM has essentially CMOS outputs and a CMOS load. The I/O portion of DDR-SDRAM consumes Zero current in the steady state when nothing is switching. In addition the current/power consumed in the I/O is NOT derived form the Iol/IOH and Vol/Voh specs. Power in CMOS switching is primarily consumed in driving capacitance - so it is a capacaitance/voltage/frequency calculation. In DRDRAM you have a DC component in the I/O as well as frequency component. So you take another look at your DDR-SDRAM power calculation. regards, Kash Johal.

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