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CN3120-400 CP - Cavium
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Cavium CN3120-400 CP
octeon cn31xx.png
General Info
DesignerCavium
ManufacturerTSMC
Model NumberCN3120-400 CP
Part NumberCN3120-400BG868-CP
MarketEmbedded
IntroductionJanuary 30, 2006 (announced)
May 1, 2006 (launched)
General Specs
FamilyOCTEON
SeriesCN3100
Frequency400 MHz
Microarchitecture
ISAMIPS64 (MIPS)
MicroarchitecturecnMIPS
Core NamecnMIPS
Process130 nm
TechnologyCMOS
Word Size64 bit
Cores2
Threads2
Max CPUs1 (Uniprocessor)
Max Memory4 GiB
Packaging
PackageHSBGA-868 (BGA)
Ball Count868
InterconnectBGA-868

The CN3120-400 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 400 MHz. 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[edit]

Main article: cnMIPS § Cache

[Edit/Modify Cache Info]

hierarchy icon.svg
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
0.0781 MiB
81,920 B
7.629395e-5 GiB
L1I$64 KiB
0.0625 MiB
65,536 B
6.103516e-5 GiB
2x32 KiB4-way set associative 
L1D$16 KiB
0.0156 MiB
16,384 B
1.525879e-5 GiB
2x8 KiB64-way set associativeWrite-through

L2$256 KiB
0.25 MiB
262,144 B
2.441406e-4 GiB
  1x256 KiB8-way set associative 

Memory controller[edit]

[Edit/Modify Memory Info]

ram icons.svg
Integrated Memory Controller
Max TypeDDR2-667
Supports ECCYes
Max Mem4 GiB
Controllers1
Channels1
Width64 bit
Max Bandwidth4.97 GiB/s
Bandwidth
Single 4.97 GiB/s

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

[Edit/Modify Memory Info]

ram icons.svg
Integrated Memory Controller
Max TypeDDR2-667
Supports ECCYes
Max Mem2 GiB
Controllers1
Channels1
Width16 bit
Max Bandwidth1.24 GiB/s
Bandwidth
Single 1.24 GiB/s

Expansions[edit]

[Edit/Modify Expansions Info]

ide icon.svg
Expansion Options
PCI-X
Width32 bit
Clock100 MHz
Rate381.5 MiB/s
USB
Revision2.0
Ports1
Rate60 MB/s
Featureshost / PHY
UART
Ports2

GP I/OYes

Networking[edit]

[Edit/Modify Network Info]

ethernet plug icon.svg
Networking
MII
GMIIYes (Ports: 1)
RGMIIYes (Ports: 3)
TDM/PCMYes

Hardware Accelerators[edit]

[Edit/Modify Accelerators Info]

hardware accel icon.svg
Hardware Accelerators
Networking
TCPYes
QoSYes

Block diagram[edit]

octeon cn31xx block diagram.png

Datasheet[edit]

Has subobject
"Has subobject" is a predefined property representing a container construct and is provided by Semantic MediaWiki.
CN3120-400 CP - Cavium#package +
base frequency400 MHz (0.4 GHz, 400,000 kHz) +
core count2 +
core namecnMIPS +
designerCavium +
familyOCTEON +
first announcedJanuary 30, 2006 +
first launchedMay 1, 2006 +
full page namecavium/octeon/cn3120-400bg868-cp +
has ecc memory supporttrue +
has hardware accelerators for network quality of service processingtrue +
has hardware accelerators for tcp packet processingtrue +
instance ofmicroprocessor +
isaMIPS64 +
isa familyMIPS +
l1$ size0.0781 MiB (80 KiB, 81,920 B, 7.629395e-5 GiB) +
l1d$ description64-way set associative +
l1d$ size0.0156 MiB (16 KiB, 16,384 B, 1.525879e-5 GiB) +
l1i$ description4-way set associative +
l1i$ size0.0625 MiB (64 KiB, 65,536 B, 6.103516e-5 GiB) +
l2$ description8-way set associative +
l2$ size0.25 MiB (256 KiB, 262,144 B, 2.441406e-4 GiB) +
ldateMay 1, 2006 +
main imageFile:octeon cn31xx.png +
manufacturerTSMC +
market segmentEmbedded +
max cpu count1 +
max memory4,096 MiB (4,194,304 KiB, 4,294,967,296 B, 4 GiB, 0.00391 TiB) +
max memory channels1 +
microarchitecturecnMIPS +
model numberCN3120-400 CP +
nameCavium CN3120-400 CP +
packageHSBGA-868 +
part numberCN3120-400BG868-CP +
process130 nm (0.13 μm, 1.3e-4 mm) +
seriesCN3100 +
supported memory typeDDR2-667 +
technologyCMOS +
thread count2 +
word size64 bit (8 octets, 16 nibbles) +