What are the difference between unified cache and split cache?

Unified cache refers to a single cache that stores both data and instructions, allowing for more efficient utilization of cache space, as it can dynamically allocate resources based on workload demands. In contrast, split cache divides the cache into separate sections for data and instructions, which can lead to faster access times for each type since they can be fetched simultaneously. While unified caches can reduce fragmentation and increase flexibility, split caches can enhance performance by minimizing cache conflicts and ensuring dedicated space for both types of information. The choice between them often depends on the specific architecture and performance requirements of the system.