48-bit computing: Difference between revisions

Revision as of 20:31, 4 July 2016

Revision as of 01:27, 15 November 2016

Line 1:

{{Unreferenced|date=August 2007}}

{{Computer architecture bit widths}}

In [[computer architecture]], '''48-bit''' [[integer (computer science)|integer]]s, can represent every integer from 0 inclusive thru 256Tera exclusive. A '''48-bit''' [[memory address]]es, orcan directly address every byte of 256 TeraBytes of storage. '''48-bit''' can refer to any other [[data#Uses of data in computing|data]] units are thoseunit that areconsumes 48 [[bit]]s (6 [[octet (computing)|octets]]) widein width. Also,Examples include 48-bit [[Central processing unit|CPU]] and [[Arithmetic logic unit|ALU]] [[computer architecture|architecture]]s are those that are based on [[processor register|register]]s, [[address bus]]es, or [[Bus (computing)|data bus]]es of that size.

==Word size==

Line 7:

==Addressing==

The [[IBM System/38]] and the [[AS/400]], in its [[Complex instruction set computer|CISC]] variants, are 48-bit addressing systems. The address size used in [[logical block addressing]] was increased to 48 bits with the introduction of [[AT Attachment#ATA standards versions, transfer rates, and features|ATA-6]]. The [[Ext4]] file system physically limits the file block count to 48 bits.

The minimal implementation of the [[x86-64]] architecture provides 48-bit addressing encoded into 64 bits; future versions of the architecture can expand this without breaking properly written applications.