Semiconductor & Computer Engineering
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Difference between revisions of "bit-slice microprocessor"
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{{title|Bit-Slice Microprocessor (BSM)}} | {{title|Bit-Slice Microprocessor (BSM)}} | ||
| − | 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]], [[ | + | 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. |
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. | 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== |
{| class="wikitable" style="text-align: center;" | {| class="wikitable" style="text-align: center;" | ||
| − | ! | + | ! Word size !! colspan="9" | Microprocessors |
|- | |- | ||
| − | | | | + | ! || [[Intel]] || [[National Semiconductor|National]] || [[AMD]] || [[Monolithic Memories|MMI]] || [[TI]] || [[Fairchild]] || [[Motorola]] || [[RCA]] || [[7400 series|7400]] |
|- | |- | ||
<!-- ======== 2-bit ======== --> | <!-- ======== 2-bit ======== --> | ||
| {{arch|2}} | | {{arch|2}} | ||
| − | || {{intel|3000}} | + | || {{intel|3000}} ([[1974]]) |
|| | || | ||
|| | || | ||
| Line 27: | Line 27: | ||
|| {{national|IMP-4}} | || {{national|IMP-4}} | ||
|| {{amd|Am2900}} | || {{amd|Am2900}} | ||
| − | || {{mmi|5700}} | + | || {{mmi|5700}} ([[1974]]) |
| − | || {{ti|SBP0400}} | + | || {{ti|SBP0400}}<br>{{ti|SN54S481|SN54S481}}<br>{{ti|SN74S481|SN74S481}} |
| − | || {{fairchild|9400}}<br | + | || {{fairchild|9400}}<br>{{fairchild|4700}} |
|| {{motorola|10800}} | || {{motorola|10800}} | ||
|| | || | ||
| − | || {{74s| | + | || {{74s|74S181}}<br>{{74s|74S381}} |
|- | |- | ||
<!-- ======== 8-bit ======== --> | <!-- ======== 8-bit ======== --> | ||
| Line 40: | Line 40: | ||
|| | || | ||
|| | || | ||
| − | || {{ti|SN54AS888}}<br | + | || {{ti|SN54AS888}}<br>{{ti|SN74AS888}} |
|| {{fairchild|100K}} | || {{fairchild|100K}} | ||
|| | || | ||
| Line 64: | Line 64: | ||
|| {{amd|Am29300}} | || {{amd|Am29300}} | ||
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| − | || | + | || {{ti|SN74ACT8832}} |
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| Line 74: | Line 74: | ||
{{stub}} | {{stub}} | ||
| + | [[Category:all microprocessor families]] | ||
Latest revision as of 18:09, 20 October 2025
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 | 7400 | |
| 2-bit | 3000 (1974) | ||||||||
| 4-bit | IMP-4 | Am2900 | 5700 (1974) | SBP0400 SN54S481 SN74S481 |
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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