Bus transmission system

Details Bus transmission system Bus transmission system

H - Electricity

04

L

340/95

H04L 5/14 (2006.01) G06F 13/40 (2006.01) H04L 12/40 (2006.01)

Patent

CA 1150793

BUS TRANSMISSION SYSTEM ABSTRACT OF THE DISCLOSURE A bus transmission system in which two or more drive circuits are connected to the same line, wherein both ends of a transmission line are grounded via a terminal resist- ance which is nearly equal to the characteristic impedance of the line, said drive circuits have three states consist- ing of a low-level state in which the output impedance is small, a high-level state in which the output impedance is small and a high-impedance state in which the output impedance is very high, and when data is not to be trans- mitted, the drive circuits is placed in the high-impedance state, when data is to be transmitted, the high-impedance state of the drive circuits is converted into the low level state in which the output impedance is small so that data can be transmitted based upon the low-level state and the high-level state, and when the transmission of data is finished, the drive circuits are placed in the low-level state again and thereafter are placed in the high-impedance state.

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