IDT73720A

16-BIT TRI-PORT BUS EXCHANGER Integrated Device Technology, Inc. IDT73720/A FEATURES: High-speed 16-bit bus exchange for interbus communication in the following environments: — Multi-way interleaving memory — Multiplexed address and data busses Direct interface to R3051 family RISChipSet™ — R3051™ family of integrated RISController™ CPUs — R3721 DRAM controller Data path for read and write operations Low noise 12mA TTL level outputs Bidirectional 3-bus architecture: X, Y, Z — One CPU bus: X — Two (interleaved or banked) memory busses:Y & Z — Each bus can be independently latched Byte control on all three busses Source terminated outputs for low noise and undershoot control 68-pin PLCC and 80-pin PQFP package High-performance CMOS technology. DESCRIPTION: The IDT73720/A Bus Exchanger is a high speed 16-bit bus exchange device intended for inter-bus communication in interleaved memory systems and high performance multiplexed address and data busses. The Bus Exchanger is responsible for interfacing between the CPU A/D bus (CPU address/data bus) and multiple memory data busses. The 73720/A uses a three bus architecture (X, Y, Z), with control signals suitable for simple transfer between the CPU bus (X) and either memory bus (Y or Z). The Bus Exchanger features independent read and write latches for each memory bus, thus supporting a variety of memory strategies. All three ports support byte enable to independently enable upper and lower bytes. FUNCTIONAL BLO...