Impedance matched bi-directional multi drop bus system, memory system using the same and memory module

1. TECHNICAL FIELD OF THE INVENTION The present invention relates to a bi-directional multi-drop bus system, a memory system and a memory module using the same. 2. The technical problem to be solved by the invention The present invention provides a bi-directional multi-drop bus system, a memory system using the same, and a memory module, in which there is no reflected wave causing mutual signal interference. 3. Summary of Solution to Invention The invention provides [K + 1] stubs; A connector to which a memory module is mounted at one end of each stub; A series load coupled to the connector; And a series load coupled to the characteristic impedance of the bus line of the stub. 4. Important uses of the invention The present invention is used in a memory system. Bus, memory system, impedance matching, echo