PA-7100LC

The PA-7100LC is a microprocessor that implements the PA-RISC 1.1 instruction set architecture (ISA) developed by Hewlett-Packard (HP).The PA-7100LC also implemented architectural improvements including the MAX-1 multimedia instructions, uncacheable memory pages, and bi-endian support.Prominently, the floating-point unit multiplier was modified to take up less area by halving the tree of carry-save adders that summed the partial products of the mantissa.The performance loss was deemed acceptable as the PA-7100LC was designed for mid-range multimedia workstations where single-precision multiplies are more prevalent.This design includes a famous "silicon doodle" of a velociraptor dinosaur (visible here in upper right corner of the die shot image).
A PA-7100LC microprocessor.
Die shot of PA-7100LC
A PA-7300LC microprocessor.
Die shot of PA-7300LC.
microprocessorPA-RISC 1.1instruction set architectureHewlett-Packardclock ratessingle instruction, multiple dataPA-7100superscalarbi-endianload–store unitfloating-point unitcarry-save adderspartial productsmantissamemory controllerceramic pin grid arrayPA-8000GSC busMicroprocessor ReportLee, R.B.IEEE Micro