R8A20210BG データシートの表示（PDF） - Renesas Electronics

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R8A20210BG

Network Address Search Engine (9 M/18 M-bit Full Ternary CAM)

Renesas Electronics 

R8A20211BG/R8A20210BG (MARIE_Blade)

Functional Description

1. High Density and Low Power Consumption

Renesas MARIE_Blade is a network search engine with the high-density TCAM memory cell. The minimized

memory cell allows MARIE_Blade to realize not only high performance but also small dimension and low power

consumption.

2. SSTL-2 Interface

SSTL2 class-1/2 can be selected depending on system board specifications.

Exception: the external Vref pin provides the input reference voltage.

3. Programmable Array

Type of array architecture does not determine a lookup size, but the basic unit of entry address for Write TCAM is

72-bit wide. Each lookup size, 72-bit/144-bit/288-bit/576-bit, for secondary search is specified when a command is

loaded: Lookup result provided by the Index Address also depends on the lookup size used.

<Entry Address> example of 18 M-bit

0, 1, 2, 3, 4, 5, … 262143: 72-bit search

0, 2, 4, 6, 8, … 262142: 144-bit search

0, 4, 8, 12, … 262140: 288-bit search

0, 8, 16, 24, … 262136: 576-bit search

Chip Image

DQ Array

DX Test Logic

DQ Array

72-bit × 16K entry (/Block)

144-bit × 8K entry (/Block)

288-bit × 4K entry (/Block)

576-bit × 2K entry (/Block)

Total: 16 Blocks

Figure 1 Block Structure

4. Bank Structure

The MARIE_Blade CAM array is comprised of two banks, which enables to perform a search in parallel. The

number of block in each bank is programmable and determined by the bankset register setting. The whole 16 blocks

are divided to any sizes. Refer to the example on the figure 2.

Chip Image

16 Blocks can be divided into

two banks according to the

serial number shown on the block.

: Bank0

: Bank1

Figure 2 Bank Structure Example

Rev.1.00 Feb 21, 2005 page 3 of 14

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