Zilog Z380
The Z380 is a Zilog 16-bit/32-bit processor from 1994. It is Z80 compatible, but it was released much later than its competitors (the Intel 386 and Motorola 68020) and as a result was never able to gain any significant market leverage. On the other hand, the newer and faster eZ80 family has been more successful recently (as of 2005).
The chip supports 16-bit processing with a clock speed of up to 20 MHz.[1]
The Z380 is incompatible with Zilog's previous generation CPU, the Z280. As the Z380 is derived from the Z180, it is a simpler, less efficient design than the Z280, with significantly fewer features:
- No pipelined execution (only fetch/execute overlap)[2]
- No memory protection
- Much simpler MMU
- Minimum of 4 clocks/instruction, against 1 (cache hit) or 2 (cache miss) on the Z280.
- No on-chip cache
- Lacks the I/O trap feature
References
- ↑ Eeiss, Ray (April 28, 1994). "Zilog extends Z80 to 16 bits, 32-bit addressing". EDN.
- ↑ "Z380 Microprocessor Product Specification" (pdf). San Jose, California: Zilog. July 2008. Retrieved April 2, 2016. page 45
- "Z380 CPU Users Manual" (pdf). San Jose, California: Zilog. February 5, 2009. Retrieved July 15, 2009.
Further reading
- Harston, J.G. (September 9, 1997). "Z380 Opcode Map". Retrieved July 15, 2009.
- Harston, J.G. (September 9, 1997). "Full Z380 Opcode List". Retrieved July 15, 2009.
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