UltraSPARC
The UltraSPARC is a microprocessor developed by Sun Microsystems and fabricated by Texas Instruments, introduced in mid-1995.It is the first microprocessor from Sun to implement the 64-bit SPARC V9 instruction set architecture (ISA).One executes floating point adds and subtracts, one multiplies, one divides and square-roots.The external cache is implemented with synchronous SRAMs clocked at the same frequency as the microprocessor, as ratios were not supported.The process was perfected on TI's MVP digital signal processor (DSP) with some features missing such as three levels of metal instead of four and a 0.55 feature size, before it was used to fabricate the UltraSPARC to avoid a repeat of the fabrication problems encountered with SuperSPARC.