Difference between revisions of "R4600"

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== External links ==
== External links ==
* [http://www.idt.com/?genID=79RV4700 R4700 Standalone Embeded CPU]
* [http://www.idt.com/?genID=79R4700 IDT 79R4700 Standalone Embeded CPU]
* [http://www.idt.com/?genID=79RV4700 IDT 79RV4700 Standalone Embeded CPU], 3.3V version
* [http://www.idt.com/products/getDoc.cfm?docID=1128 TN-22 R4600 Cache Initialization]

Revision as of 13:22, 28 September 2006


The R4600 Orion started shipping in 1994 as the first microprocessor developed by Quantum Effect Devices, Inc. in collaboration with Integrated Device Technology, Toshiba Corporation, and NKK Corporation. R4600 implements the MIPS III instruction set in a simple but effective 5-stage pipeline. It's very similar to the R4000 and R4400 processors but unlike these there is no integrated second level cache controller.


IDT R4700
The R4700 Orion represents kind of an R4600 second edition. At October 1997 IDT announced 200MHz R4700. It's virtually identical but offers slightly faster floating point performance. The only workstation vender to use the R4700 was Siemens-Nixdorf in a variant of the RM 200 C workstation. Linux supports the R4700 but this hasn't actually been tested since several years.

SGI Indy specifics

R4600 processor modules for the Silicon Graphics Indy were available in several versions:

  • 100MHz without second level cache controller
  • 100MHz with 512kB of second level cache controlled by an external controller
  • 133MHz without second level cache controller
  • 133MHz with 512kB of second level cache controlled by an external controller

The external cache controller used is the same as for Indy R5000SC processor modules. It is not coherent therefore requires special software support which Linux implements in sc-ip22.c

External links