H - Electricity – 03 – K
Patent
H - Electricity
03
K
340/80
H03K 5/02 (2006.01) H04L 5/16 (2006.01) H04L 12/40 (2006.01)
Patent
CA 1257355
11 ABSTRACT For the extension of busses, use is made of special bus driver and receiver circuits which are capable of (dis-) charging the higher capacitances of longer bus lines more quickly. However, in such circuit arrangements the direction is reversed by means of special control signals so that data transmission always takes place always in only one direction; or in other known circuits the reversal is liable to give rise to interference signals. In accordance with the invention, each bus of a local sub-system is connected to the control input of a transistor, notably a PNP-transistor whose collector is connected to O V and whose emitter is connected to the extended bus and, via a resistor, to +U. Moreover, between the emitter and the base there is connected a resistor which represents the pull-up resistor for the signals produced on the bus, the signals arriving via the extended bus are coupled onto the bus of the sub-system via this resistor. Unproblematic reversal of the transmission direction is thus possible.
488727
Hesse Winfried
Schillhof Udo
Fetherstonhaugh & Co.
N.v.philips'gloeilampenfabrieken
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