Arrangement preventing multiple connections to peripheral circuits

An arrangement for switchably interconnecting a plurality of peripheral circuits (116) and a plurality of accessing circuits (113a through 113n) adapted to generate peripheral circuit address signals, said arrangement comprising connection means (402A through 402M and 403) for interconnecting said accessing circuits and said peripheral circuits;

• characterized in that
• said connection means is responsive to said peripheral address signals and to connection enable signals;
• and
• said arrangement further comprises:
• first generator means (503) responsive to said peripheral circuit address signals for generating connection request signals to identify peripheral circuits to which connection is requested;
• and
• second generator means (407A, 510A through 501N, 505A through 505N, 506A through 506N, 507A through 507N, 508, 509) responsive to said connecction request signals for generating busy signals if two or more of said accessing circuits request connection to the same one of said peripheral circuits and for generating said connection enable signals if only one of said accessing circuits requests connection to a given one of said peripheral circuits;
• and
• selector means (504) connected to said second generator means and responsive to said peripheral circuit address signals from each of said accessing circuits to select and to transmit corresponding busy signals and corresponding connection enable signals to each of said accessing circuits.