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- Newsgroups: comp.arch
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!mips!mips!decwrl!pa.dec.com!weir.pa.dec.com!ed
- From: ed@weir.pa.dec.com (Ed Gould)
- Subject: Re: 64-bit CPU vs 2 x 32-bit CPUs
- Message-ID: <1992Jul26.044548.356@PA.dec.com>
- Keywords: pins
- Sender: news@PA.dec.com (News)
- Reply-To: ed@pa.dec.com
- Organization: DEC Network Systems Lab, Palo Alto
- References: <1992Jul26.032636.244142@cs.cmu.edu> <1387@sousa.ltn.dec.com> <1992Jul25.151537.19358@ntuix.ntu.ac.sg>
- Date: Sun, 26 Jul 92 04:45:48 GMT
- Lines: 13
-
- > Since the DEC 21064 Alpha chip only supports 43-bit effective virtual
- > addresses, the cost is approximately 43-32=11 pins.
-
- According to the data sheet I have, the 21064 implements 43-bit virtual
- addresses (even though all 64 bits are checked), but only 34-bit
- physical addresses. Hence, it's only *two* pins. I can't imagine that
- that's particularly significant.
-
- --
- Ed Gould ed@pa.dec.com Digital Equipment Corporation
- +1 415 688 1309 Network Systems Lab 505 Hamilton Ave, Palo Alto, CA 94301
-
- "Unison is only one form of harmony." -- LW
-