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Presence or absence of a module on a card is detected by providing the connection in the module between two pins thereof and an additional external circuit without a jumper.
English (United States)
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Automatic Module Detection
Presence or absence of a module on a card is detected by providing the
connection in the module between two pins thereof and an additional external
circuit without a jumper.
When the existence of a module on a socket is to be detected electrically, a
prior practice was to connect a jumper which informs the insertion of the module.
However, this method may cause trouble due to the inconsistency of jumper
setting with the real existence of the module. The method described here does
not cause such inconsistency because the module itself is used as a jumper to
signal the insertion.
Referring to Fig. 1, when it is desired to implement this technique, two pins
are connected electrically inside the module. One of two socket pins
corresponding to the two module pins is pulled up and the other socket pin is
connected to ground (OV). Then the signal indicating the existence of the
module is obtained. T his signal is used as the input to a logic circuit to function
differently depending upon the existence of the module.
Fig. 2 shows the second example. In this application, the module is a ROS
(read-only storage). Assume you have two alternative stores, A and B. ROS A
is always installed and must be disabled in case that ROS B is installed. If B is
not inserted in the socket, ROS A must be enabled. ROS B has a pair of
interconnected pins one of which is used to receive an input signal to address
this module. ROS A has an input pin to disable the da...