Skip to main content

Ricoh 5A22









Ricoh 5A22


From Wikipedia, the free encyclopedia

Jump to navigation
Jump to search






The Ricoh 5A22 is a microprocessor produced by Ricoh for the Super Nintendo Entertainment System (SNES) video game console. The 5A22 is based on the 8/16-bit CMD/GTE 65c816, itself a version of the WDC 65C816 (used in the Apple IIGS personal computer). It has a 8-bit data bus, a 16-bit accumulator, a 24-bit address bus, and is based on the MOS Technology 6502 family of processors.




Contents






  • 1 Major features


  • 2 Performance


  • 3 See also


  • 4 References





Major features[edit]




Ricoh 5A22


In addition to the 65C816 CPU core, the 5A22 contains support hardware, including:



  • Controller port interface circuits, including serial access to controller data

  • An 8-bit parallel I/O port, which is mostly unused in the SNES

  • Circuitry for generating non-maskable interrupts on V-blank

  • Circuitry for generating interrupts on calculated screen positions

  • A DMA unit, supporting two primary modes:

    • General DMA, for block transfers at a rate of 2.68 MB/s


    • H-blank DMA, for transferring small data sets at the end of each scanline outside of the active display period




  • Multiplication and division registers

  • Two separate address busses driving the 8-bit data bus: a 24-bit "Bus A" for general access, and an 8-bit "Bus B" mainly for APU and PPU registers



Performance[edit]


The CPU as a whole employs a variable-speed system bus, with bus access times determined by the memory location accessed. The bus runs at 3.58 MHz for non-access cycles and when accessing Bus B and most internal registers, and either 2.68 or 3.58 MHz when accessing Bus A. It runs at 1.79 MHz only when accessing the controller port serial-access registers.[1] It works at approximately 1.5 MIPS and has a theoretical peak of 1.79 million 16-bit adds per second.



See also[edit]


  • Super Nintendo Entertainment System technical specifications


References[edit]





  1. ^ anomie. "Anomie's SNES Memory Mapping Doc" (text). Retrieved 2009-03-16..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}





















Retrieved from "https://en.wikipedia.org/w/index.php?title=Ricoh_5A22&oldid=858777358"





Navigation menu


























(window.RLQ=window.RLQ||).push(function(){mw.config.set({"wgPageParseReport":{"limitreport":{"cputime":"0.276","walltime":"0.357","ppvisitednodes":{"value":659,"limit":1000000},"ppgeneratednodes":{"value":0,"limit":1500000},"postexpandincludesize":{"value":94776,"limit":2097152},"templateargumentsize":{"value":87,"limit":2097152},"expansiondepth":{"value":7,"limit":40},"expensivefunctioncount":{"value":1,"limit":500},"unstrip-depth":{"value":1,"limit":20},"unstrip-size":{"value":2483,"limit":5000000},"entityaccesscount":{"value":0,"limit":400},"timingprofile":["100.00% 212.889 1 -total"," 32.95% 70.153 10 Template:Navbox"," 31.66% 67.392 1 Template:Reflist"," 31.04% 66.090 1 Template:Refimprove"," 26.60% 56.630 1 Template:Cite_web"," 17.90% 38.114 1 Template:Ambox"," 9.79% 20.832 1 Template:Nintendo_hardware"," 8.15% 17.348 1 Template:Ricoh"," 5.68% 12.095 1 Template:MOS_CPU"," 5.34% 11.376 2 Template:Asbox"]},"scribunto":{"limitreport-timeusage":{"value":"0.104","limit":"10.000"},"limitreport-memusage":{"value":3007188,"limit":52428800}},"cachereport":{"origin":"mw1230","timestamp":"20181026165402","ttl":1900800,"transientcontent":false}}});mw.config.set({"wgBackendResponseTime":99,"wgHostname":"mw1266"});});
-

Popular posts from this blog

Florida Star v. B. J. F.

Image
Florida Star v. B. J. F. From Wikipedia, the free encyclopedia Jump to navigation Jump to search United States Supreme Court case Florida Star v. B. J. F. Supreme Court of the United States Argued March 21, 1989 Decided June 21, 1989 Full case name The Florida Star v. B. J. F. Citations 491 U.S. 524 ( more ) 109 S. Ct. 2603; 105 L. Ed. 2d 443; 1989 U.S. LEXIS 3120; 57 U.S.L.W. 4816; 16 Media L. Rep. 1801 Prior history The Florida Star v. B.J.F., 530 So.2d 286 (1988) Supreme Court of Florida; Florida Star v. B.J.F., 499 So.2d 883 (1986) Fla. Dist. Court of Appeals Holding Florida Stat. § 794.03 is unconstitutional to the extent it makes the truthful reporting of information that was a matter of public record unlawful, as it violates the First Amendment. Court membership Chief Justice William Rehnquist Associate Justices William J. Brennan Jr.  · Byron White Thurgood Marshall  · Harry Blac...
Read more

Danny Elfman

Image
Danny Elfman From Wikipedia, the free encyclopedia Jump to navigation Jump to search Danny Elfman Elfman at the 2010 San Diego Comic-Con Born Daniel Robert Elfman ( 1953-05-29 ) May 29, 1953 (age 65) Los Angeles, California, U.S. Spouse(s) Bridget Fonda ( m.  2003) Children 1 Musical career Genres Rock [1] ska [2] new wave film music video game music Occupation(s) Composer, singer, songwriter, record producer Instruments Trombone guitar percussion vocals keyboards [3] Years active 1972–present Associated acts Oingo Boingo James Newton Howard Daniel Robert Elfman (born May 29, 1953) is an American composer, singer, songwriter, and record producer. Elfman first became known for being the lead singer and songwriter for the band Oingo Boingo from 1974 to 1995. He is well known for scoring films and television shows, particularly his frequent collabora...
Read more

Lugert, Oklahoma

Image
Unincorporated community in Oklahoma, United States Lugert, Oklahoma Unincorporated community Foundations from the town of Lugert at the bottom of Lake Altus-Lugert Lugert, Oklahoma Location within the state of Oklahoma Coordinates: 34°53′45″N 99°16′31″W  /  34.89583°N 99.27528°W  / 34.89583; -99.27528 Coordinates: 34°53′45″N 99°16′31″W  /  34.89583°N 99.27528°W  / 34.89583; -99.27528 Country United States State Oklahoma County Kiowa Time zone UTC-6 (Central (CST))  • Summer (DST) UTC-5 (CDT) GNIS feature ID 1100597 Lugert is an unincorporated community in Kiowa County, Oklahoma. [1] The town of Lugert was founded in 1901 on 80 acres (320,000 m 2 ). In the town, there was a general store that housed the Post office and sold dry goods, school supplies, groceries, harnesses, axes and much more. It was named for Frank Lugert, who had moved to the area in 1898. Lugert owned land where the town was sited and also owned the general st...
Read more