Editing Motorola 56000 (section)

== Applications and variants ==
[[File:Motorola DSP56002 die.JPG|thumb|180px|[[Die (integrated circuit)|Die]] of Motorola DSP56002.]]
[[File:NeXTcube motherboard.jpg|thumb|upright|[[Motherboard]] of a [[NeXTcube]] from 1990 featuring the [[Motorola 68040]] [[CPU]] and Motorola DSP56001 digital signal processor.]]
In most designs the 56000 is dedicated to one single task, because digital signal processing using special hardware is mostly [[real-time computing|real-time]] and does not allow any [[interrupt]]ion. For less demanding tasks which are not time-critical, designers normally use a separate [[central processing unit|CPU]] or [[microcontroller|MCU]].

The 56000 can execute a 1024-point complex [[Fast Fourier transform]] (FFT) in 59,898 clock cycles, taking 1.8&nbsp;ms at 33&nbsp;MHz,<!--page_3--><ref name=fs561a>[http://cache.freescale.com/files/dsp/doc/inactive/DSP56001A.pdf freescale.com – Product Preview, 24-BIT DIGITAL SIGNAL PROCESSOR, DSP56001A], 1997 ([https://web.archive.org/web/20190209123945/http://cache.freescale.com/files/dsp/doc/inactive/DSP56001A.pdf archived 2019])</ref> or a rate of just over 555 operations per second, allowing both realtime decoding and encoding of reasonably advanced audio codecs such as MP3 for direct-to-disc recording purposes.<ref>{{cite web|title=How MP3 Works: Inside the Codec|url=http://oreilly.com/catalog/mp3/chapter/ch02.html|work=MP3: The Definitive Guide|publisher=O'Reilly|accessdate=16 April 2013|author=Scot Hacker}}</ref><ref>{{cite web|title=Development of MP3|url=http://guide-for-mp3.blogspot.co.uk/|work=Guide for MP3 blog|accessdate=16 April 2013|author=Mike Adana}}</ref>

The addition of [[SIMD]] instructions to most desktop computer [[central processing unit|CPU]]s have meant that dedicated DSP chips like the 56000 have partly disappeared from some application fields, but they continue to be used widely in communications and other professional uses. To this end the '''56800''' series added a complete [[Microcontroller|MCU]] which created a single-chip "DSPcontroller" solution, while the opposite occurred in the 68456, a [[Motorola 68000|68000]] with a 56000 on it.

A still quite prevalent model of the 56000 is the third generation '''56300''' family, starting with the 56301,<ref>{{cite web|author=Motorola|date=October 1999|title=56301 SPEC|url=http://198ic.com/pdf_info/pdf_file/d/47949.pdf|url-status=live|archive-url=https://web.archive.org/web/20200815072540/http://198ic.com/pdf_info/pdf_file/d/47949.pdf|archive-date=15 August 2020|accessdate=7 August 2020|work=128IC|id=DSP56301P/D}}</ref> which features several models with special applications hard- and firmware built-in, like [[Peripheral Component Interconnect|PCI]] interface logic, [[cyclic redundancy check|CRC]] processors, or audio [[companding|companders]]. Core clock frequencies ranged up to 250&nbsp;MHz.<ref>''DSP56K Family Overview'', p. 45 ff in [https://web.archive.org/web/20190821072341/https://www.nxp.com/docs/en/brochure/BYNDDSPBRO.pdf ''Beyond DSPs, November 2010''] (freescale/NXP).</ref>

The 56000 provides a comprehensive suite of [[development tool]], including a [[C (programming language)|C]] [[Compiler]], an [[Assembly_language#Assembler|Assembler]], and an [[Instruction set simulator]].<ref>{{cite web |url=https://www.nxp.com/docs/en/user-guide/56KCCUM.pdf |title=Motorola DSP56000 Family Optimizing C Compiler User's Manual, Release 6.3 |accessdate=2023-11-10 }}</ref><ref>{{cite web |url=https://instrumentation.obs.carnegiescience.edu/ccd/tools/DSPASMRM.pdf |title=MOTOROLA DSP ASSEMBLER REFERENCE MANUAL |accessdate=2023-11-12}}</ref><ref>{{cite web |url=http://www.bitsavers.org/components/motorola/56000/1995_Motorola_DSP_Simulator_Reference_Manual.pdf |title=MOTOROLA DSP SIMULATOR REFERENCE MANUAL |accessdate=2023-11-12}}</ref>