Microprocessor control circuit
First Claim
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1. A processor control circuit for use in a computer system operated to generate an interrupt signal, said control circuit comprising:
- a processing unit operated to generate a group of internal address, data and control signals;
a master bus transceiver connected to said processing unit;
a system data bus connected to said master bus transceiver;
said master bus transceiver operated in response to a first predetermined pattern of said internal address and control signals to transfer said internal data signals to said system data bus;
a local bus transceiver connected to said system data bus and said processing unit; and
an input-output device connected to said local bus transceiver and said processing unit;
said local bus transceiver operated in response to a second predetermined pattern of said internal address and control signals to transfer data from said system data but to said local bus transceiver;
said input-output device operates in response to a third predetermined pattern of said internal address and control signals to transfer data from said local bus transceiver to said input-output device;
said input-output device further operated in response to a fourth predetermined pattern of said internal address and control signals to transfer data to said local bus transceiver;
said local bus transceiver operated in response to a fifth predetermined pattern of said internal address and control signals to transfer data from said input-output device to said system data bus;
said master bus transceiver operated in response to a sixth predetermined pattern of said internal address and control signals to transfer data from said system data bus to said processing unit;
said input-output device comprisinga programmable interrupt controller connected to said computer system and said processing unit, operated in response to said data from said local bus transceiver to arrange an interrupt recognition sequence;
said programmable interrupt controller further operated in response to said interrupt signal to generate an interrupt received signal;
said processing unit further operated in response to said interrupt received signal to generate an interrupt acknowledge signal;
said programmable interrupt controller further operated in response to said interrupt acknowledge signal and said fourth pattern of internal address and control signals to transfer interrupt identification data to said local bus transceiver.
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Abstract
A control circuit, for use in a telephone switching system, which monitors, controls and transfers data to and from memory, input-output devices and external circuits. A microprocessor operates under control of read-only and random-access memories. It communicates with the external telephone system via bus transceivers and a programmable interrupt controller. The integrity of this circuit is monitored by high reliability data and address parity circuits.
20 Citations
12 Claims
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1. A processor control circuit for use in a computer system operated to generate an interrupt signal, said control circuit comprising:
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a processing unit operated to generate a group of internal address, data and control signals; a master bus transceiver connected to said processing unit; a system data bus connected to said master bus transceiver; said master bus transceiver operated in response to a first predetermined pattern of said internal address and control signals to transfer said internal data signals to said system data bus; a local bus transceiver connected to said system data bus and said processing unit; and an input-output device connected to said local bus transceiver and said processing unit; said local bus transceiver operated in response to a second predetermined pattern of said internal address and control signals to transfer data from said system data but to said local bus transceiver; said input-output device operates in response to a third predetermined pattern of said internal address and control signals to transfer data from said local bus transceiver to said input-output device; said input-output device further operated in response to a fourth predetermined pattern of said internal address and control signals to transfer data to said local bus transceiver; said local bus transceiver operated in response to a fifth predetermined pattern of said internal address and control signals to transfer data from said input-output device to said system data bus; said master bus transceiver operated in response to a sixth predetermined pattern of said internal address and control signals to transfer data from said system data bus to said processing unit; said input-output device comprising a programmable interrupt controller connected to said computer system and said processing unit, operated in response to said data from said local bus transceiver to arrange an interrupt recognition sequence;
said programmable interrupt controller further operated in response to said interrupt signal to generate an interrupt received signal;
said processing unit further operated in response to said interrupt received signal to generate an interrupt acknowledge signal;
said programmable interrupt controller further operated in response to said interrupt acknowledge signal and said fourth pattern of internal address and control signals to transfer interrupt identification data to said local bus transceiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification