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A '''bit-slice microprocessor''' ('''BSM''') is a [[microprocessor]] designed as a module with the primary purpose of being able to assemble multiple identical such microprocessors to form a larger processor of some desired [[word size]]. Bit-slice microprocessors can be cascaded to produce any conventional (e.g. [[4-bit architecture|4-bit]], [[8-bit architecture|8-bit]], [[16-bit architecture|16-bit]]) as well as unconventional word sizes (e.g. [[10-bit architecture|10-bit]], [[12-bit architecture|12-bit]], [[16-bit architecture|16-bit]]). A notable advantage of a BSM over discrete logic components is the fact that most connections are internal to the chip with only few connections being external.  
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{{title|Bit-Slice Microprocessor (BSM)}}
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A '''bit-slice microprocessor''' ('''BSM''') is a [[microprocessor]] designed as a module with the primary purpose of being able to assemble multiple identical such microprocessors to form a larger processor of some desired [[word size]]. Bit-slice microprocessors can be cascaded to produce any conventional (e.g. [[4-bit architecture|4-bit]], [[8-bit architecture|8-bit]], [[16-bit architecture|16-bit]]) as well as unconventional word sizes (e.g. [[10-bit architecture|10-bit]], [[12-bit architecture|12-bit]], [[18-bit architecture|18-bit]]). A notable advantage of a BSM over discrete logic components is the fact that most connections are internal to the chip with only few connections being external.  
  
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A departure from normal [[microprocessor]]s is that fact that bit-slice chips do not have an [[instruction set architecture]]. Bit slicing allows designers to create their own architecture and other key characteristics such as I/O pins and address width. This flexability of course came with overall more expensive system and larger amount of ICs.  
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A departure from normal [[microprocessor]]s is that fact that many bit-slice chips do not have an [[instruction set architecture]]. Such bit slicing systems allow designers to create their own architecture and other key characteristics such as I/O pins and address width. This flexibility of course came with overall more expensive system and larger amount of ICs.  
  
 
== bit-slice microprocessors==
 
== bit-slice microprocessors==
 
{| class="wikitable" style="text-align: center;"
 
{| class="wikitable" style="text-align: center;"
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! [[Word size]] !! colspan="8" | Microprocessors
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! [[Word size]] !! colspan="9" | Microprocessors
 
|-
 
|-
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| || Intel || National || AMD || MMI || TI || Fairchild || Motorola ||
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| || Intel || National || AMD || MMI || TI || Fairchild || Motorola || RCA ||  
 
|-
 
|-
 
<!-- ======== 2-bit ======== -->
 
<!-- ======== 2-bit ======== -->
−
| [[2-bit architecture|2-bit]]
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| {{arch|2}}
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|| [[Intel 3002|3002]]
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|| {{intel|3000}}
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||
 
||
 
||
 
||
 
||
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|-
 
|-
 
<!-- ======== 4-bit ======== -->
 
<!-- ======== 4-bit ======== -->
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| [[4-bit architecture|4-bit]]
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| {{arch|4}}
 
||
 
||
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|| [[National IMP-4|IMP-4]]
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|| {{national|IMP-4}}
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|| {{amd|am2900|2900}}
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|| {{amd|Am2900}}
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|| [[MMI 5701|5701]]<br />[[MMI 6701|6701]]
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|| {{mmi|5700}}
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|| [[TI SBP0400|SBP0400]]
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|| {{ti|SBP0400}}<br />{{ti|SN74S481|SN54S/74S481}}
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|| [[Fairchild 9405|9405]]<br />[[Fairchild 9405A|9405A]]
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|| {{fairchild|9400}}<br />{{fairchild|4700}}
−
|| {{motorola|mc10800 series|MC10800}}
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|| {{motorola|10800}}
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|| [[74181]]
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||
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|| {{74s|74S181}}<br />{{74s|74S381}}
 
|-
 
|-
 
<!-- ======== 8-bit ======== -->
 
<!-- ======== 8-bit ======== -->
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| [[8-bit architecture|8-bit]]
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| {{arch|8}}
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||
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|| {{national|IMP-8}}
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||
 +
||
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|| {{ti|SN54AS888}}<br />{{ti|SN74AS888}}
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|| {{fairchild|100K}}
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||
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|| {{rca|EPIC}}
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||
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|-
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<!-- ======== 16-bit ======== -->
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| {{arch|16}}
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||
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|| {{national|IMP-16}}
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|| {{amd|Am29100}}
 
||
 
||
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|| [[National IMP-8|IMP-8]]
 
 
||
 
||
 
||
 
||
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|| [[TI SN54AS888|SN54AS888]]<br />[[TI SN74AS888|SN74AS888]]
 
 
||
 
||
 
||
 
||
 
||
 
||
 
|-
 
|-
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<!-- ======== 16-bit ======== -->
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<!-- ======== 32-bit ======== -->
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| [[16-bit architecture|16-bit]]
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| {{arch|32}}
 
||
 
||
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|| [[National IMP-16|IMP-16]]
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||  
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|| [[AMD 29100|29100]]
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|| {{amd|Am29300}}
 
||
 
||
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|| {{ti|SN74ACT8832}}
 
||
 
||
 
||
 
||

Latest revision as of 07:12, 13 March 2019

A bit-slice microprocessor (BSM) is a microprocessor designed as a module with the primary purpose of being able to assemble multiple identical such microprocessors to form a larger processor of some desired word size. Bit-slice microprocessors can be cascaded to produce any conventional (e.g. 4-bit, 8-bit, 16-bit) as well as unconventional word sizes (e.g. 10-bit, 12-bit, 18-bit). A notable advantage of a BSM over discrete logic components is the fact that most connections are internal to the chip with only few connections being external.

A departure from normal microprocessors is that fact that many bit-slice chips do not have an instruction set architecture. Such bit slicing systems allow designers to create their own architecture and other key characteristics such as I/O pins and address width. This flexibility of course came with overall more expensive system and larger amount of ICs.

bit-slice microprocessors[edit]

Word size Microprocessors
Intel National AMD MMI TI Fairchild Motorola RCA
2-bit 3000
4-bit IMP-4 Am2900 5700 SBP0400
SN54S/74S481 		9400
4700 		10800 74S181
74S381
8-bit IMP-8 SN54AS888
SN74AS888 		100K EPIC
16-bit IMP-16 Am29100
32-bit Am29300 SN74ACT8832


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