Daniel C. Murray

A 1 GHz power efficient single chip multiprocessor system for broadband networking applications

The Broadcom BCM12500 is a high performance system on a chip (SOC) targeted at network centric tasks. The chip consists of two high performance SB-1 MIPS64/sup TM/ CPUs, a shared 512 KB L2 cache, a DDR memory controller, and integrated I/O. All major blocks of the processor are connected together via the ZBbus/sup TM/; a high speed split transaction fully coherent multi processor bus. Three Gigabit Ethernet MACs enable a direct interface to network elements. High-speed system I/O is provided using AMDs Lightning Data Transport (LDT/sup TM/) I/O fabric and a 66 MHz PCI bus. The die measures 14.2 mm by 13.3 mm in a bulk 0.15 /spl mu/m CMOS technology and has a power dissipation of 13 W at 1.2 V and 1 GHz.

A 25W SoC with Dual 2GHz Power Cores and Integrated Memory and I/O Subsystems

An SoC is presented with dual 2GHz Powertrade cores, coherent crossbar interconnect, 2MB L2 cache, and memory and I/O subsystem. The chip consumes a maximum of 25W of power. The 115mm2 die is implemented in a 65nm 8M process with low-power design techniques. Circuits to improve system performance under power constraints are discussed