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).
![](../I/m/Zilog_Z382_1.jpg)
Zilog Z382
The chip supports 32-bit processing with a clock speed of up to 20 MHz.[1]
The Z380 is incompatible with Zilog's older Z800 and Z280. As the Z380 is derived from the newer Z180 it is a less mini computer like design than these older processors, with fewer features. Instead it has a wider ALU and register length of 32-bits. It can therefore address 4 GB directly:
- Similar pipelined execution or fetch/execute overlap as the Z280[2]
- Simpler MMU, without memory protection.
- Minimum of 2 clocks/instruction. This is like the Z280, but also for 32 bit operations.
- No on-chip cache, as it is redundant with the faster static RAMs of the 1990s and onwards.
- Lacks the I/O trap feature
References
- Notes
- 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
- Bibliography
- "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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