Original: Intel Core Duo (product code 80539) consists of two cores on one die, a 2 MB L2 cache shared by both cores, and an arbiter bus that controls both L2 cache and FSB (front-side bus) access.
Simplified: The Intel Core Duo has two cores, 2 Mebibytes of L2 cache for both cores, and an arbiter bus that controls the L2 cache and front side bus access.