FA NETWORK LSI AND COMMUNICATION DEVICE

摘要

An FA network LSI is provided in a communication device performing a communication process in a network layer or higher through a plurality of protocols. The FA network LSI includes a data-link layer processing unit that performs a process in a data link layer for control data, and a protocol processing unit that performs a process in the network layer or higher for the control data. The data-link layer processing unit includes a first data-link layer processing unit to process dedicatedly to correspond to a protocol required high speed processing, a second data-link layer processing unit to process in a standard data link layer, for a protocol other than the protocol required the high speed processing, and a data-link-layer-processing selection unit to select one of the two units mentioned-above. The data-link layer processing unit is formed by hardware.

主权项

1. An FA network LSI used in an FA system in which a plurality of communication devices are connected via a network, and incorporated in the communication device capable of performing a communication process in a network layer or higher via a plurality of protocols, the FA network LSI comprising:
a data-link layer processing unit that performs a process in a data link layer for control data communicated with the network; and a protocol processing unit that performs a process in a network layer or higher for the control data, wherein the data-link layer processing unit includes
a first data-link layer processing unit that performs a first data-link layer process in the data link layer defined dedicatedly to correspond to a protocol for which high speed processing is required,a second data-link layer processing unit that performs a second data-link layer process in a standard data link layer for a protocol other than the protocol for which the high speed processing is required, anda data-link-layer-processing selection unit that selects one of the first data-link layer processing unit and the second data-link layer processing unit in accordance with a predetermined criterion for transmitted control data or received control data, and the data-link layer processing unit is formed by hardware.