Inserting an L1 cache between the CPU and main memory The tiny, very fast CPU register file has room for four 4-byte words The transfer unit between the CPU register file and the cache is a 4-byte block line o The small fast L1 cache has room line 1 for two 4-word blocks The transfer unit between the cache and main memory is a 4-word block (16 bytes) block 10 a b cd The big slow main memory block 21pqrs has room for many 4-word blocks block 30wxyz7 Inserting an L1 cache between the CPU and main memory block 10 a b c d block 21 p q r s ... ... block 30 w x y z ... The big slow main memory has room for many 4-word blocks. The small fast L1 cache has room for two 4-word blocks. The tiny, very fast CPU register file has room for four 4-byte words. The transfer unit between the cache and main memory is a 4-word block (16 bytes). The transfer unit between the CPU register file and the cache is a 4-byte block. line 0 line 1