Zilog Z380

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Zilog Z382

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
  • Watch-Dog Timer (WDT)
  • Up to 32 General-Purpose I/O Pins n
  • DC to 20 MHz Operating Frequency @ 5.0V n
  • DC to 10 MHz Operating Frequency @ 3.3Vn
  • 144-Pin QFP and VQFP Style Packages

References[]

Notes
  1. ^ a b https://www.zilog.com/docs/datacomm/pb0075.pdf
  2. ^ Eeiss, Ray (April 28, 1994). "Zilog extends Z80 to 16 bits, 32-bit addressing". EDN.
  3. ^ "Z380 Microprocessor Product Specification" (pdf). San Jose, California: Zilog. July 2008. Retrieved April 2, 2016. page 45
Bibliography

Further reading[]


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