Patent ID: 7190675
Filing Date: 2007-03-13
Classification: H04L

Abstract:
1. A LAN relaying apparatus comprising: a reception side memory circuit in which data is written from a first side based on a reception side write control signal and from which data is read out to a second side based on a reception side read control signal; a reception side write control circuit which has a reception side write pointer to said reception side memory circuit and which outputs said reception side write control signal to said reception side memory circuit for a first side write operation; a reception side read control circuit which has a reception side read pointer to said reception side memory circuit and which outputs said reception side read control signal to said reception side memory circuit for a second side read operation; and a reception side control circuit which receives said reception side write pointer from said reception side write control circuit and said reception side read pointer from said reception side read control circuit, determines a reception side pointer difference between said side reception side write pointer and said reception side read pointer, controls said reception side read control circuit to start said second side read operation when said reception side pointer difference is equal to a reception side first threshold held therein, and controls at least one of said reception side write control circuit and said reception side read control circuit such that at least one of said first side write operation and said second side read operation is carried out based on said reception side pointer difference, when said reception side pointer difference is not equal to said reception side first threshold after the start of said second side read operation.