5.3.3. Memory Access
The Nios II/s core provides instruction cache, but no data cache. The instruction cache size is user-definable, between 512 bytes and 64 KB. The Nios II/s core can address up to 2 GB of external memory. The Nios II architecture reserves the most-significant bit of data addresses for the bit-31 cache bypass method. In the Nios II/s core, bit 31 is always zero.
For information regarding data cache bypass methods, refer to the Processor Architecture chapter of the Nios® II Processor Reference Handbook.
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