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Cavium CN3120-300 CP
General Info
Designer	Cavium
Manufacturer	TSMC
Model Number	CN3120-300 CP
Part Number	CN3120-300BG868-CP
Market	Embedded
Introduction	January 30, 2006 (announced) May 1, 2006 (launched)
General Specs
Family	OCTEON
Series	CN3100
Frequency	300 MHz
Microarchitecture
ISA	MIPS64 (MIPS)
Microarchitecture	cnMIPS
Core Name	cnMIPS
Process	130 nm
Technology	CMOS
Word Size	64 bit
Cores	2
Threads	2
Max Memory	4 GiB
Multiprocessing
Max SMP	1-Way (Uniprocessor)
Electrical
Power dissipation	3 W
Packaging
Package HSBGA-868 (BGA) Ball Count 868 Interconnect BGA-868

The CN3120-300 SCP is a 64-bit dual-core MIPS communication microprocessor (CP) designed by Cavium and introduced in 2006. This processor, which incorporates two cnMIPS cores, operates at 300 MHz and dissipates 3 Watts. This processor includes a number of hardware accelerators for network processing such as high-performance I/O packet processing, TCP, and QoS. This MPU supports up to 4 GiB of 64-bit DDR2-667 ECC memory.

Cache

Main article: cnMIPS § Cache

[Edit/Modify Cache Info]

Cache Organization Cache is a hardware component containing a relatively small and extremely fast memory designed to speed up the performance of a CPU by preparing ahead of time the data it needs to read from a relatively slower medium such as main memory. The organization and amount of cache can have a large impact on the performance, power consumption, die size, and consequently cost of the IC. Cache is specified by its size, number of sets, associativity, block size, sub-block size, and fetch and write-back policies. Note: All units are in kibibytes and mebibytes.

L1$ 80 KiB 81,920 B 0.0781 MiB L1I$ 64 KiB 65,536 B 0.0625 MiB 2x32 KiB 4-way set associative   L1D$ 16 KiB 16,384 B 0.0156 MiB 2x8 KiB 64-way set associative Write-through L2$ 256 KiB 0.25 MiB 262,144 B 2.441406e-4 GiB     1x256 KiB 8-way set associative

Memory controller

[Edit/Modify Memory Info]

	Integrated Memory Controller
	Max Type DDR2-667 Supports ECC Yes Max Mem 4 GiB Controllers 1 Channels 1 Width 64 bit Max Bandwidth 4.97 GiB/s 5,089.28 MiB/s 5.336 GB/s 5,336.497 MB/s 0.00485 TiB/s 0.00534 TB/s Bandwidth Single 4.97 GiB/s

Optional low-latency controller for content-based processing and meta data

[Edit/Modify Memory Info]

	Integrated Memory Controller
	Max Type DDR2-667 Supports ECC Yes Max Mem 2 GiB Controllers 1 Channels 1 Width 16 bit Max Bandwidth 1.24 GiB/s 1,269.76 MiB/s 1.331 GB/s 1,331.44 MB/s 0.00121 TiB/s 0.00133 TB/s Bandwidth Single 1.24 GiB/s

Expansions

[Edit/Modify Expansions Info]

	Expansion Options
	PCI-X Width 32 bit Clock 100 MHz Rate 381.5 MiB/s USB Revision 2.0 Ports 1 Rate 60 MB/s Features host / PHY UART Ports 2 GP I/O Yes

Networking

[Edit/Modify Network Info]

	Networking
	MII GMII Yes (Ports: 1) RGMII Yes (Ports: 3) TDM/PCM Yes

Hardware Accelerators

[Edit/Modify Accelerators Info]

	Hardware Accelerators
	Networking TCP Yes QoS Yes

Block diagram

Datasheet

• OCTEON CN31XX Single- and Dual-Core Product Briefn