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4
• Real-time performance
− Cache Lock Function: Lock one set of the two-way set associative cache memory to keep data in
cache memory
• Debug support
− Breakpoint
− Single step execution
• Real-time debug system interface
1.1.3 Low power consumption
• Power Down mode
− Prepare for Reduced Frequency mode: Control the clock frequency of the R3900 Processor Core
with a clock generator
− Halt and Doze mode: Stop R3900 Processor Core operations
• Clock can be stopped
− Clock signal can be stopped at high state
1.1.4 Development environment for embedded arrays and cell-based ICs
• Compact core
• Easy-to-design peripheral circuits
− Single direction separate bus: Bus configuration suitable for core
− Built-in cache memory: No need to consider cache operation timing
• ASIC Process
• Sufficient Development Environment