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CN3120-300 CP - Cavium
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Template:mpu 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]

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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 KiB4-way set associative 
L1D$16 KiB
16,384 B
0.0156 MiB
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/Modify Memory Info]

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Integrated Memory Controller
Max TypeDDR2-667
Supports ECCYes
Max Mem4 GiB
Controllers1
Channels1
Width64 bit
Max Bandwidth4.97 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]

ram icons.svg
Integrated Memory Controller
Max TypeDDR2-667
Supports ECCYes
Max Mem2 GiB
Controllers1
Channels1
Width16 bit
Max Bandwidth1.24 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]

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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/Modify Network Info]

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Networking
MII
GMIIYes (Ports: 1)
RGMIIYes (Ports: 3)
TDM/PCMYes

Features

Hardware acceleration units:

  • Packet I/O processing
  • QoS
  • TCP Acceleration

Block diagram

octeon cn31xx block diagram.png

Datasheet

has ecc memory supporttrue +
l1$ size80 KiB (81,920 B, 0.0781 MiB) +
l1d$ description64-way set associative +
l1d$ size16 KiB (16,384 B, 0.0156 MiB) +
l1i$ description4-way set associative +
l1i$ size64 KiB (65,536 B, 0.0625 MiB) +
l2$ description8-way set associative +
l2$ size0.25 MiB (256 KiB, 262,144 B, 2.441406e-4 GiB) +
max memory bandwidth4.97 GiB/s (5,089.28 MiB/s, 5.336 GB/s, 5,336.497 MB/s, 0.00485 TiB/s, 0.00534 TB/s) + and 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) +
max memory channels1 +
supported memory typeDDR2-667 +