Communications: electrical – Digital comparator systems
Patent
1975-05-14
1977-02-01
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
G06F 916
Patent
active
040064654
ABSTRACT:
Apparatus under microprocessor control for use in communicating over a serial communication loop with a remote attached control unit. It is capable of establishing frame synchronization, interpreting commands, assembling data and transmitting bits on the loop. The apparatus also communicates with I/O devices over a demand/response interface.
A microprocessor interface with the loop includes loop sync control which establishes bit synchronization and generates a restart pulse at bit receive time and bit send time. The execution of instructions by the microprocessor is stopped and the microprocessor enters a wait state when it has finished all previous work and is ready to receive a loop bit. When it is time to receive the loop bit the microprocessor is restarted in response to the restart pulse from the loop synchronization control.
For output operations to a device, the microprocessor loads the device address and a device command or data into shift registers and initiates the transfer by setting a latch. When the transfer to the device is completed, this latch is reset in response to a signal from the device.
REFERENCES:
patent: 3828326 (1974-08-01), Cash
patent: 3842405 (1974-10-01), Key et al.
Cross Jon L.
Homan Merle Edward
Machol Guenther Keith
Malm Richard La Verne
Svelund Larry Eugene
Bartz C. T.
Beckstrand Shelley M.
International Business Machines - Corporation
Lamb Owen L.
Shaw Gareth D.
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