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

To: Bilow who wrote (75143)	6/29/2001 6:46:15 AM
From: John Walliker	Read Replies (1) \| Respond to of 93625

Carl, Actually, it's a bit different as a stuck output ruins more than one bit of received data per 64/72-bit word. This makes parity correction, "difficult". In other words, if the output is stuck, or if the mux tree inside the DRAM is stuck, then that DRAM generates 4 bad bits per 64-bit word, and that is not correctable, or even necessarily detectable. Conventional DRAM, since only one DRAM provides each bit out of a 64/72-bit word has no problem with a stuck bit. Parity/ECC Rambus modules are 18 bits wide, so there will be 8 protection bits per 64 bit data word. This is sufficient to detect and correct a 4-bit fault. However, the main purpose of ECC is to deal with soft memory errors which are usually only single bit. John