Introduction; Summary; G.1 Introduction - Sun Microsystems UltraSPARC-I User Manual

Differences Between UltraSPARC Models

G.1 Introduction

This Appendix documents the technical differences between the UltraSPARC
models described in this manual. These models are:
•
UltraSPARC-I
•
UltraSPARC-II
G.2 Summary
UltraSPARC-I is the base processor model. UltraSPARC-II supports the following
enhancements:
•
Reduced gate dimensions (0.35 µ) and faster cycles times (4 ns)
•
8 Mb and 16 Mb E-Cache sizes
•
Additional Processor : System clock ratios
•
Use of reduced cost / increased density E-Cache SRAMs
•
Support for PREFETCH{A} instructions
•
Three outstanding Read transactions, instead of only one
•
Two outstanding Writeback transactions, instead of only one
•
Ability to programmatically limit the number of outstanding Read and
Writeback transactions
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