Semiconductor & Computer Engineering
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Revision as of 15:42, 5 November 2015
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, 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.
A departure from normal microprocessors 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.
bit-slice microprocessors
| Word size | Microprocessors | |||||||
|---|---|---|---|---|---|---|---|---|
| Intel | National | AMD | MMI | TI | Fairchild | Motorola | ||
| 2-bit | 3000 | |||||||
| 4-bit | IMP-4 | 2900 | 5701 6701 |
SBP0400 | 9400 | MC10800 | 74181 | |
| 8-bit | IMP-8 | SN54AS888 SN74AS888 |
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| 16-bit | IMP-16 | 29100 | ||||||
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