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ProducedFrom 1992 to 1994
Designed bySun Microsystems
Max. CPU clock rate40 MHz to 125 MHz
Instruction setSPARC V8

The microSPARC (code-named "Tsunami") is a microprocessor implementing the SPARC V8 instruction set architecture (ISA) developed by Sun Microsystems. It was a low-end microprocessor intended for low-end workstations and embedded systems. The microprocessor was developed by Sun, but the floating-point unit (FPU) was licensed from Meiko Scientific. It contained 800,000 transistors.

There were two derivatives of the microSPARC: the microSPARC-II and microSPARC-IIep. The microSPARC-IIep was a 100 MHz microSPARC-II with an integrated PCI controller for embedded systems. It was developed and fabricated by LSI Logic for Sun. The microprocessor was used by Sun in their JavaStation Network Computer.

Name (codename) Model Frequency (MHz) Arch. version Year Total threads[1] Process (µm) Transistors (millions) Die size (mm²) IO Pins Power (W) Voltage (V) L1 Dcache (k) L1 Icache (k) L2 Cache (k) L3 Cache (k)
microSPARC I (Tsunami) TI TMS390S10 40–50 V8 1992 1×1=1 0.8 0.8 225? 288 2.5 5 2 4 none none
microSPARC II (Swift) Fujitsu MB86904 / Sun STP1012 60–125 V8 1994 1×1=1 0.5 2.3 233 321 5 3.3 8 16 none none


  1. ^ Threads per core × number of cores
  • Sun Microsystems, Inc. (10 August 1992). "Highly Integrated SPARC Processor Implementation (Tsunami)". Hot Chips presentation.'