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>" a long time ago, when microcoded architectures were the default,..." They are default the now though. As far as I know hardwired control logic wasn't used
by bogomipz 9y ago
>" a long time ago, when microcoded architectures were the default,..."
They are default the now though. As far as I know hardwired control logic wasn't used for very long before people moved to using microcode. Maybe I am misunderstanding that part of your comment?
- userbinator 9y agoIt's a combination of microcode and hardwired logic that's common now --- hardwired simple instructions, microcoded complex ones.
- bogomipz 9y agoIn the slide during the presentation at the 10:23 minute mark he shows the short decoders under the instruction register and I believe even those simple instructions are all made up of micro-ops that need to be looked up in ROM as well.
- monocasa 9y agoThe CPU only executes micro ops, but the "vector decoder" is the only one that uses microcode to sequence the ops.
- deleted 9y ago[deleted]
- pfalcon 9y agoYou must be kidding. Normal CPU architectures - the RISC ones - don't have funny things like "microcode" (well, true RISCs don't have it for sure). Majority of CPU architectures nowadays are RISCs. Some legacy ones, like x86, are CISC-translated-to-RISC, as this presentation shows. The native RISC code in them is called "microcode".
- bogomipz 9y agoOh yes I was just kidding. Can we assume you must be kidding too when you use the phrase "Normal CPU architectures"?