US3919693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Associative interface for single bus communication system
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1974-07-26
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Granted: 1975-11-11
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Expires: 1994-07-26
Abstract
Abstract The disclosure describes a data processing system including first and second receiving devices and a sending device interconnected by a common communication bus. A transmitter in the sending device transmits different types of identification signals in order to transmit data signals selectively to the first or second receiving devices. Each of the receiving devices stores a genus identification signal which is common to both devices. In addition, the first receiving device stores a first species identification signal and the second receiving device stores a second species identification signal. In order to communicate a data signal to both the first and second receiving devices, the transmitter in the sending device transmits the common genus identification signal followed by the data signal. If communication with the first receiving device alone is desired, both the genus identification signal and the first species identification signal are transmitted on the bus prior to the data signal. If communication with the second receiving device alone is desired, both the genus identification signal and the second species identification signal are transmitted on the bus prior to the data signal.
Inventors
- 👤 George A Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:57
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/0008; G; G06; G06F; G06F12/00; G06F12/02; G06F12/06; G06F12/0646; G06F12/0653; G06F12/0661; H04L12/00; H04L12/28; H04L12/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
408 words
In a data processing system including a first receiving device, a second receiving device and a sending device interconnected by a bus, improved apparatus for transmitting data from the sending device to the first and second receiving devices comprising: transmitting means in the sending device for transmitting on the bus during a first time period a genus identification signal generic to the first and second receiving devices followed by a first data signal so that the first data signal can be received by both the first and second receiving devices, for transmitting on the bus during a second time period the genus identification signal and a first species identification signal specific to the first receiving device followed by a second data signal so that the second data signal can be received only by the first receiving device, and for transmitting on the bus during a third time period the genus identification signal and a second species identification signal specific to the second receiving device followed by a third data signal so that the third data signal can be received only by the second receiving device; first data receiving means in the first receiving device responsive to the genus identification signal on the bus and the absence of the first and second species identification signals on the bus for accepting the first data signal from the bus, responsive to the combination of the genus and first species identification signals on the bus for accepting the second data signal from the bus and responsive to the combination of the genus and second species identification signals on the bus for rejecting the third data signal on the bus; and second data receiving means in the second receiving device responsive to the genus identification signal on the bus and the absence of the first and second species identification signals on the bus for accepting the first data signal from the bus, responsive to the combination of the genus and the first species identification signals on the bus for rejecting the second data signal on the bus and responsive to the combination of the genus and second species identification signals on the bus for accepting the third data signal from the bus, whereby the sending device can transmit data to the first and second receiving devices by transmitting a genus identification signal which is used as part of the identification signals required to transmit data to the first or second receiving devices individually.
Claim 2
Dependent Claim
408 words
In a data processing system including a first receiving device, a second receiving device and a sending device interconnected by a bus, improved apparatus for transmitting data from the sending device to the first and second receiving devices comprising: transmitting means in the sending device for transmitting on the bus during a first time period a genus identification signal generic to the first and second receiving devices followed by a first data signal so that the first data signal can be received by both the first and second receiving devices, for transmitting on the bus during a second time period the genus identification signal and a first species identification signal specific to the first receiving device followed by a second data signal so that the second data signal can be received only by the first receiving device, and for transmitting on the bus during a third time period the genus identification signal and a second species identification signal specific to the second receiving device followed by a third data signal so that the third data signal can be received only by the second receiving device; first data receiving means in the first receiving device responsive to the genus identification signal on the bus and the absence of the first and second species identification signals on the bus for accepting the first data signal from the bus, responsive to the combination of the genus and first species identification signals on the bus for accepting the second data signal from the bus and responsive to the combination of the genus and second species identification signals on the bus for rejecting the third data signal on the bus; and second data receiving means in the second receiving device responsive to the genus identification signal on the bus and the absence of the first and second species identification signals on the bus for accepting the first data signal from the bus, responsive to the combination of the genus and the first species identification signals on the bus for rejecting the second data signal on the bus and responsive to the combination of the genus and second species identification signals on the bus for accepting the third data signal from the bus, whereby the sending device can transmit data to the first and second receiving devices by transmitting a genus identification signal which is used as part of the identification signals required to transmit data to the first or second receiving devices individually.
Claim 3
Dependent Claim
19 words
Apparatus, as claimed in claim 1, wherein the sending device comprises a data processor having memory and computational ability.
Claim 4
Dependent Claim
24 words
Apparatus, as claimed in claim 2, wherein the first and the second receiving devices each comprise a data processor having memory and computational ability.
Claim 5
Dependent Claim
39 words
Apparatus, as claimed in claim 1, wherein the transmitting means comprises synchronizing means for transmitting on the bus a synchronizing signal which identifies the end of one said identification signals and the beginning of one of said data signals.
Claim 6
Dependent Claim
28 words
Apparatus, as claimed in claim 4, wherein the transmitting means comprises serial means for transmitting the identification signals and the data signals serially one bit at a time.
Claim 7
Dependent Claim
99 words
Apparatus, as claimed in claim 5, wherein the serial means comprises: a first register for storing one of said identification signals; a counter for storing a counter signal representing the number of bits in said one identification signal stored in the first register; control means for reducing the number of bits represented by the counter signal each time a bit of the identification signal stored in the first register is transmitted on the bus; and means for causing the synchronizIng means to transmit the synchronizing signal on the bus when the counter signal represents a predetermined number of bits.
Claim 8
Dependent Claim
73 words
Apparatus, as claimed in claim 1, wherein the first data receiving means comprises: a name register for storing one of said identification signals; comparison means for generating a match signal when the identification signal transmitted on the bus matches the identification signal stored in the name register; and means for accepting the data signal transmitted on the bus following the transmission on the bus of the identification signal stored in the name register.
Claim 9
Dependent Claim
123 words
Apparatus, as claimed in claim 7, wherein the name register comprises a shift register having an output terminal for successively shifting a bit of the identification signal stored in the shift register to the output terminal each time a bit of the identification signal is transmitted on the bus, and wherein said comparison means comprises: an exclusive OR gate having a first input operatively connected to the output terminal, a second input connected to the bus and also having an output; and a flipflop circuit having an input connected to the output of the exclusive OR gate whereby the flipflop is set to a predetermined state if the identification signal transmitted in the bus matches the identification signal stored in the shift register.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |