Back to results
US 4,068,215 AGranted
Cross-point switch matrix and multistage switching network using the same
AssigneeHitachi, Ltd.
InventorsTakuji Mukaemachi, Shiro Enami
Life of this patent
Estimating the term…
Abstract
A plurality of cross-point matrices each having a plurality of holding circuits respectively associated with a corresponding cross point are arranged in multiple stages, which are linked with each other to form a multi-stage switching network. Each switch matrix is provided with an associated NAND gate connected to gates capable of being selectively impressed with the signals representing the state of the holding circuits in a row or column within the particular switch matrix. The output of the NAND gate is connected to an OR gate for each stage.
Claims8
A cross-point switch matrix comprising:
- a plurality of bistable holding circuits respectively associated with a plurality of cross-points defined by rows and columns of a matrix;
- a plurality of cross-point elements being opened or closed in response to the state of their associated holding circuits;
- control means for selectively placing each respective bistable holding circuit in one of the bistable states thereof independently of the state of each other holding circuit;
- read means, provided in each row or column of said matrix, for reading out the state of at least one of the holding circuits associated with the cross-points arranged in said row or column and thereby identify whether a cross-point is open or closed;
- and
- logic OR means having inputs connected to the outputs of all of the read means provided in the respective rows or columns of said matrix;
- and
- wherein said control means is capable of simultaneously controlling the selective placing of plural ones of said holding circuits in one of the bistable states thereof.
5 more elements
Dependencies are inferred from the claim text.