Engineering:Zilog Z380
The Z380 and Z382 are Zilog 16-bit/32-bit processor from 1994.[1] 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 was more successful.
The chip supports 32-bit processing with a clock speed of up to 20 MHz.[2]
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[3]
- 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
The Z382 is marked as a Data Communications Controller and in addition to the Z380 has addition I/O features.[1]
- 16550 Mimic with I/O Mailbox, DMA Mailbox, and 16 mABus Drive
- 3 HDLC Synchronous Serial Channels–Serial Data Rate of up to 10 Mbps
- GCI/SCIT Bus Interface
- 8 Advanced DMA Channels with 24-Bit Addressing
- Plug-and-Play ISA Interface
- PCMCIA Interface
- 2 Enhanced ASCIs (UARTs) with 16-Bit Baud RateGenerators (BRG)
- Clocked Serial I/O Channel (CSIO) for Use with SerialMemory
- Two 16-Bit Timers with Flexible Prescalers
- Three Memory Chip Selects with Wait state Generators
- Watchdog Timer (WDT)
- Up to 32 General-purpose I/O Pins
- DC to 20 MHz Operating Frequency @ 5.0V
- DC to 10 MHz Operating Frequency @ 3.3V
- 144-Pin QFP and VQFP Style Packages
References
- Notes
- ↑ 1.0 1.1 https://www.zilog.com/docs/datacomm/pb0075.pdf [bare URL PDF]
- ↑ Eeiss, Ray (April 28, 1994). "Zilog extends Z80 to 16 bits, 32-bit addressing". EDN.
- ↑ "Z380 Microprocessor Product Specification". San Jose, California: Zilog. July 2008. http://www.zilog.com/docs/serial/z380.pdf. page 45
- Bibliography
- "Z380 CPU Users Manual". San Jose, California: Zilog. February 5, 2009. http://www.zilog.com/docs/serial/z380um.pdf.
Further reading
- Harston, J.G. (September 9, 1997). "Z380 Opcode Map". http://mdfs.net/Docs/Comp/Z380/OpCodeMap.
- Harston, J.G. (September 9, 1997). "Full Z380 Opcode List". http://mdfs.net/Docs/Comp/Z380/OpList.
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