Integrated Secondary Cache for PowerPC Microprocessors

The MPC2605 is a single chip, 256KB integrated look–aside cache with copy–back capability designed for PowerPC applications (MPC603 and MPC604). Using 0.38 μm technology along with standard cell logic technology, the MPC2605 integrates data, tag, host interface, and least recently used (LRU) memory with a cache controller to provide a 256KB, 512KB, or 1 MB Level 2 cache with one, two, or four chips on a 64–bit PowerPC bus.

? Single Chip L2 Cache for PowerPC

? 66 MHz Zero Wait State Performance (2–1–1–1 Burst)

? Four–Way Set Associative Cache Design

? 32K x 72 Data Memory Array

? 8K x 18 Tag Array

? Address Parity Support

? LRU Cache Control Logic

? Copy–Back or Write–Through Modes of Operation

? Copy–Back Buffer for Improved Performance

? Single 3.3 V Power Supply

? 5 V Tolerant I/O

? One, Two, or Four Chip Cache Solution (256KB, 512KB, or 1MB)

? Single Clock Operation

? Compliant with IEEE Standard 1149.1 Test Access Port (JTAG)

? Supports up to Four Processors in a Shared Cache Configuration

? High Board Density 25 mm 241 PBGA Package