KE5BLME008 Просмотр технического описания (PDF) - KAWASAKI MICROELECTRONICS

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KE5BLME008

Longest Match Engine

KAWASAKI MICROELECTRONICS 

Kawasaki LSI

8K Longest Match Search Engine (KE5BLME008)

PRELIMINARY

4. Functional Descriptions

4.1. Overview

KL5BLME008 is a search device for 32-bit IP address searches in IP routing applications. Its

capability extends beyond a simple lookup of data entries stored in a routing table. With its

compatibility with the CIDR (Classless Inter-Domain Routing), it outputs associated data for

the longest match data when there are multiple matching entries. KE5BLME008 also has the

search capability of finding the exact 32-bit match for searching the host address.

Moreover, LME008 provides a solution to routes having the same address with different

prefix length. Let us assume, for instance, the presence of both 192.1.0.0/16 and 192.1.0.0/24

in a routing table; the search key of 192.1.1.2 outputs associated data relative to 192.1.0.0/16

whereas the search key of 192.1.0.3 outputs ones relative to 192.1.0.0/24.

KL5BLME008 is a triple-port architecture equipped with task-specific ports: Input port

conducting a search, Output port effecting a result, and CPU port executing commands and

accessing to a register. This triple-port architecture facilities insertion and deletions of entries

without interrupting a search operation.

In order to store data, LME008 operates with an external 16Mbit EDO DRAM. Memory

control operations such as DRAM accesses and Refresh are, however, controlled by the

device itself.

4.2. Reset

The LME008 device requires a reset after chip power up. A reset can be applied by either

supplying a low pulse to the RSTN pins or writing any data onto a Reset register. The values

reassigned for both pins and registers are as follows:

Registers

CNTL:

0000b

STAT0:

1x00b

STAT1:

0000b

PR0 – RR2:

Unknown

Almost Full Address:

0FFFh

Refresh Counter Constant: 000001b (01h)

Pins

IRQN:

FLN:

AMFLN:

CCMPN:

ODONEN:

MDONEN:

HON:

DWEN:

DOEN:

DRAS:

DCAS:

High-Z

High

High

Low

High

High

High

High

High

High

High

Version1.0.1

Proprietary and Confidential

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