| 摘要 |
PROBLEM TO BE SOLVED: To make the intervals between memory modules narrow since a certain interval is necessary as the efficiency of transmission, i.e., the degree of coupling, and should not be less than the wiring length that a directional coupler occupies although bus-connected module intervals are determined by the wiring length. SOLUTION: Since a wire (main line) from a memory controller is made to have open ends or short-circuit ends and signals can be generated in both the directions of the directional coupler by using a progressive wave and a reflected wave, DRAMs can be connected to both the sides of the coupler. Consequently, the wiring length of the coupler is reducible to a half of the pitch between modules, so that high-density mounting becomes possible.
|
