U.S. Philips Corporation

Denis R Pottier

Jean Gobert

Joseph Hoppe

Edmond Lemaire

Mira Pauker

Louis Quere

Jean-Louis Goudard

Luyen Letat

The clock circuit is formed by an oscillator (10-12) which is coupled to a counter/divider circuit (15) provided with read accesses (30). In order to prevent falsification of its data, the circuit is formed as a protected casing and includes a protected access circuit (50) which is connected between said accesses and the counter/divider circuit. Furthermore, a circuit for monitoring the frequency of the oscillator may be provided (100-50).

Device for protecting the validity of time sensitive information

A multiprogramming data processing system comprises a plurality of data processing devices P1, P2, P3, P4 each having local storage 110-116 and has furthermore an interconnecting standard bus 100. The program is divided in program segments S1-S4, while the program segments are grouped into program portions (k, m, n). The respective program portions are each stored at one of the local memory sections. When an extended branch instruction calls an address in a different program portion, a portion change interrupt signal (26) is generated, whereby dynamical allocation of the execution of program segments may be realized. When a privileged portion (0) is called, the portion change interrupt is nullified, both at the calling to, (28) and the return (23) from the privileged program portion.

Multiprocessor computer system with dynamic allocation of

A data processing system, comprising a central unit, peripheral units, and input/output processors which are connected parallel to a common bus. The said processors centralize the exchanges between a plurality of peripheral units and the store. The data exchanges can be effected in the mode 'programmed bus', in which the central unit is the master of the system, or by way of the 'multiplex bus', where the exchange is controlled by the input/output processor in word blocks. The interruption system utilizes a second bus which is independent of the first bus, so that the simultaneous transfer of the interruption vectors and data is possible.

Data processing system comprising input/output processors

Growing community of inventors

L'Hay les Roses, France

Denis R Pottier