Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral monitoring
Patent
1997-12-30
2000-12-05
Lee, Thomas C.
Electrical computers and digital data processing systems: input/
Input/output data processing
Peripheral monitoring
370236, 370506, 709232, 714 4, 714 10, G06F 1100, H04L 116
Patent
active
06157967&
ABSTRACT:
A multiprocessor system includes a number of sub-processor systems, each substantially identically constructed, and each comprising a central processing unit (CPU), and at least one I/O device, interconnected by routing apparatus that also interconnects the sub-processor systems. A CPU of any one of the sub-processor systems may communicate, through the routing elements, with any I/O device of the system, or with any CPU of the system.
Communications between I/O devices and CPUs is by packetized messages. Interrupts from I/O devices are communicated from the I/O devices to the CPUs (or from one CPU to another CPU) as message packets.
CPUs and I/O devices may write to, or read from, memory of a CPU of the system. Memory protection is provided by an access validation method maintained by each CPU in which CPUs and/or I/O devices are provided with a validation to read/write memory of that CPU, without which memory access is denied.
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Baker William Edward
Bunton William Patterson
Cutts, Jr. Richard W.
Garcia David J.
Horst Robert W.
Lee Thomas C.
Tandem Computer Incorporated
Wang Albert
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