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Re: Chipsets with Dual Address Cycles (64 bit addresses)
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: Chipsets with Dual Address Cycles (64 bit addresses)
- From: Pavel.Peleska@oen.siemens.de
- Date: 6 Mar 98 17:33:40 MEZ
- Resent-Date: Fri, 6 Mar 1998 09:18:51 -0800
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-ID: <"KvoYo1.0.IN5.8e20r"@electra.znyx.com>
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The Pentium II/Pro Processors support 36 physical address bits, i.e.
physically 64 GB can be accessed. However the logical addressing is still
based on 32 bits, so to make use of the extended physical addressing
capabilities the MMU has to be programmed adequately.
Pavel Peleska
-------------
Original Text
From: C=DE/A=SMTP/DDA=ID/pci-sig-request(a)znyx.com, on 05.03.1998 17:32:
>does anyone know of chip sets for Intel Pentium/Pentium II-CPU with a
north
>bridge that (optionally) supports dual address cycles (64 bit addresses)?
Since the Pentium and Pentium-II only support a maximum 4GB address space,
and the Pentium-II's built in level 2 cache only has tag space for 512MB of
ram (and most Pentium chipsets only have tag space for 64MB), I can't see
what the purpose of supporting 64 bit addresses would be.
-jrp