Relay device
AssigneeOki Electric Industry Co., Ltd.
InventorToshihiko Nakamura
Life of this patent
Estimating the term…
Abstract
A data relay device transmitting received unit data has an external interface unit, a main control unit, where the received unit data are received from outside the data relay device and transmitted to the corresponding destination memory not through the main control unit. The external interface unit is equipped with memory in the external interface, the threshold setting unit, and the external control unit. The main control unit receiving the threshold receiving notice reads the information in the corresponding field of the received unit data stored in the memory in the external interface and judges whether the received unit data should be transmitted, or not. The main control unit deletes the received unit data judged to be unnecessary before the transmitting.
Claims10
A relay device using the Direct Memory Access method comprising:
- a main control unit;
- and
- an external interface unit being configured to receive receiving data from outside, said external interface being configured to transmit directly said receiving data to a corresponding destination memory independent of said main control unit, said external interface unit comprising,
- a memory unit being configured to store said receiving data as stored data in descending order said receiving data,
- a threshold setting unit being configured to set a threshold corresponding to a quantity of said stored data, and
- a control unit being configured to send a predetermined reaching threshold notice to said main control unit upon a data quantity of said stored data reaching a predetermined threshold,
- said main control unit being configured to delete said receiving data judged as deletion data being unnecessary upon judging whether said receiving data unnecessary to be transmitted to said corresponding destination memory upon said main control unit receiving said reaching threshold notice and reading corresponding information of a field of said stored data stored.
A relay device comprising:
- a CPU being configured to control components;
- a main memory being configured to store data, said main memory being configured to have a control program written therein to process communication protocol, said main memory being configured to be accessed by said CPU;
- an external interface unit being configured to receive receiving data from outside, said external interface including,
- a memory unit being configured to store said receiving data as stored data in descending order said receiving data,
- a threshold setting unit being configured to set a threshold corresponding to a quantity of said stored data, and
- a control unit being configured to send a predetermined reaching threshold notice to said CPU upon a data quantity of said stored data reaching a predetermined threshold;
- and
- a bus being configured to connect said CPU, said main memory, and said external interface to transmit data via Direct Memory Access transmission,
- said CPU being configured to delete said receiving data judged as deletion data being unnecessary upon judging whether said receiving data unnecessary to be transmitted to said corresponding destination memory upon said CPU receiving said reaching threshold notice and reading corresponding information of a field of said stored data stored.
Dependencies are inferred from the claim text.