3DO Development Repo

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The 3DO uses an ARMv3 based processor: the ARM60.

  * 32bit Addressing
  * Clocked at 12.5MHz
  * 10 MIPS @ 12MHz

===== Datasheets / Documents =====

  * {{:documentation:hardware:arm60_datasheet_-_zarlink_semiconductor.pdf|ARM60 datasheet (Zarlink Semiconductor)}}
  * {{:documentation:hardware:arm60_datasheet_-_gec_plessey_semiconductors.pdf|ARM60 datasheet (Gec Plessey Semiconductors)}}
  * {{:documentation:hardware:arm60_datasheet_-_vlsi_technology.pdf|ARM60 datasheet (VLSI Technology)}}
  * {{:documentation:hardware:arm_image_format.pdf|ARM Image Format}}
  * {{:documentation:hardware:fixed_point_arithmetic_on_the_arm.pdf|Fixed Point Arithmatic on the ARM}}
  * {{:documentation:hardware:writing_efficient_c_for_arm.pdf|Writing Efficient C for ARM}}
  * {{:documentation:hardware:procedure_call_standard_for_the_arm_architecture.pdf|Procedure Call Standard for the Arm Architecture}}
  * {{:documentation:hardware:arm_opcode_reference.pdf|ARM opcode reference}}

===== Docs about ARM from 3DO =====
  *  [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/arrfldr/0arrfrst.html|ARM Reference Manual]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/arrfldr/arr1frst.html#XREF37859|The ARM C Compiler]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/arrfldr/arr2frst.html#XREF25147|ARM C Library Porting Guide]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/arrfldr/arr3frst.html#XREF25184|The ARM Linker]]
  *  [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/atsfldr/0atsfrst.html|ARM Technical Specifications]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/atsfldr/ats1frst.html#XREF23107|ARM Image Format]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/atsfldr/ats2frst.html#XREF16187|ARM Object Format]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/atsfldr/ats3frst.html#XREF40359|ARM Object Library Format]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/atsfldr/ats4frst.html#XREF28151|ARM Procedure Call Standard]]
  *  [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/augfldr/0augfrst.html|ARM User's Guide]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/augfldr/aug1frst.html#XREF20531|The ARM C Compiler]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/augfldr/aug2frst.html#XREF22713|The ARM Assembler (armasm)]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/augfldr/aug3frst.html#XREF21025|The ARM Linker (armlink)]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/augfldr/aug4frst.html#XREF15841|The ARM Librarian (armlib)]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/augfldr/aug5frst.html#XREF39634|The ARM Object Format Decoder (decaof)]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/augfldr/aug6frst.html#XREF20727|An Introduction to the Run-Time Libraries]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/augfldr/aug7frst.html#XREF15616|ARM Assembly Language]]
  *  [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/acbfldr/0acbfrst.html|ARM Cookbook]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/acbfldr/acb1frst.html#XREF13490|ARM Instruction Set and Processor Features]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/acbfldr/acb2frst.html#XREF32584|Exploring ARM Assembly Language]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/acbfldr/acb3frst.html#XREF41444|Interfacing Assembly Language and C]]
      * [[https://ext.3dodev.com/3DO/Portfolio_2.5/OnLineDoc/DevDocs/tktfldr/acbfldr/acb4frst.html#XREF37173|Programming in C]]

===== RAM and Hardware Access Latency =====

|Non-sequential RAM|5 ticks|
|Short non-sequential|3 ticks <nowiki>(add internal if page changed)</nowiki>|
|<nowiki>Sequential RAM reads</nowiki>|2 ticks|
|<nowiki>Sequential RAM writes</nowiki>|2 ticks|
|<nowiki>Internal</nowiki>|<nowiki>2 ticks</nowiki>|
|<nowiki>Non-</nowiki>sequential<nowiki> CLIO registers</nowiki>|<nowiki>5 ticks minimum</nowiki>|
|Sequential CLIO registers|3 ticks minimum|
|<nowiki>Non-</nowiki>sequential<nowiki> MADAM registers</nowiki>|<nowiki>5 ticks minimum</nowiki>|
|Sequential MADAM registers|<nowiki>2 ticks minimum</nowiki>|
|ROM|35 ticks|
|<nowiki>Non-</nowiki>sequential<nowiki> Trace</nowiki>|5 ticks minimum|
|Sequential Trace|3 ticks minimum|
|SPORT reads|7 ticks|
|SPORT writes|6 ticks|
|SlowBus (short)|7 ticks|
|SlowBus (long)|13 ticks|
|<nowiki>Hardware after Internal</nowiki>|<nowiki>5 ticks, but 2nd tick is longer (hw decoder)</nowiki>|

=====   =====
3DO Development Repo

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