Back to results
US 6,185,150 B2Granted
Clock-synchronous system
AssigneeKabushiki Kaisha Toshiba
InventorsHaruki Toda, Kenji Tsuchida, Hitoshi Kuyama
Life of this patent
Estimating the term…
Abstract
A delay circuit produces an activation signal by delaying a clock signal by 270 degrees. A receiver circuit is responsive to the activation signal to capture a command latch enable signal indicating a command cycle and produce an internal signal corresponding to the command cycle. An AND circuit produces a command latch signal synchronized with the clock signal during an interval in which the internal signal is produced. Command receivers take command-forming signals only when the command latch signal is applied thereto. That is, these command receivers are activated only when the command latch signal is received but not at all times. This prevents power dissipation from increasing and allows a plurality of signals to be monitored reliably.
Claims28
A clock-synchronous system comprising:
- a first activation signal producing circuit for producing a first activation signal with each clock of a clock signal;
- a first receiver circuit responsive to the first activation signal from the first activation signal producing circuit for capturing an indication signal for indicating an input signal capture cycle in which an input signal is to be captured, the first receiver circuit producing an internal signal corresponding to the indication signal;
- a second activation signal producing circuit connected to receive the internal signal produced by the first receiver circuit and the clock signal for producing a second activation signal synchronous with the clock signal during an interval when the internal signal is produced;
- and
- a second receiver circuit responsive to the second activation signal from the second activation signal producing circuit for capturing the input signal.
2 more elements
A clock-synchronous system comprising:
- a memory that operates in synchronization with a clock signal;
- a first activation signal producing circuit for producing a first activation signal with each clock of the clock signal;
- a first receiver circuit responsive to the first activation signal from the first activation signal producing circuit for capturing an indication signal for indicating an input signal capture cycle in which a plurality of input signals that form a command are to be captured, the first receiver circuit producing an internal signal corresponding to the indication signal;
- a second activation signal producing circuit connected to receive the internal signal produced by the first receiver circuit and the clock signal for producing a second activation signal synchronized with the clock signal during an interval when the internal signal is produced;
- and
- a plurality of second receiver circuits responsive to the second activation signal from the second activation signal producing circuit for capturing the input signals that form a command;
- a decoder for decoding output signals of the second receiver circuits to produce the command;
- and
- a control circuit responsive to the command from the decoder for controlling the memory.
6 more elements
A clock-synchronous system comprising:
- a first receiver circuit for capturing an indication signal indicating an input signal capture cycle in synchronization with a clock signal, said first receiver circuit outputting an internal signal when the indication signal is captured;
- an activation signal producing circuit for producing an activation signal responsive to the internal signal supplied from the first receiver circuit and the clock signal;
- and
- a second receiver circuit for capturing the input signal responsive to the activation signal supplied from the activation signal producing circuit.
1 more element
A clock-synchronous system comprising:
- a first activation signal producing circuit for producing a first activation signal with each clock of a clock signal;
- a first receiver circuit responsive to the first activation signal supplied from the first activation signal producing circuit for capturing an indication signal for indicating an input signal capture cycle in which an input signal is to be captured, said first receiver circuit outputting an internal signal when the indication signal is captured;
- a second activation signal producing circuit for producing a second activation signal responsive to the internal signal supplied from the first receiver circuit and the clock signal;
- and
- a second receiver circuit for capturing the input signal responsive to the second activation signal supplied from the second activation signal producing circuit.
2 more elements
A clock-synchronous system comprising:
- a first receiver circuit for capturing an indication signal indicating an input signal capture cycle in synchronization with a clock signal, said first receiver circuit outputting an internal signal when the indication signal is captured;
- an activation signal producing circuit for producing an activation signal responsive to the internal signal supplied from the first receiver circuit, said activation signal producing circuit producing the activation signal during an interval when the internal signal is supplied;
- and
- a second receiver circuit for capturing the input signal responsive to the activation signal supplied from the activation signal producing circuit.
1 more element
A clock-synchronous system comprising:
- a first activation signal producing circuit for producing a first activation signal with each clock of a clock signal;
- a first receiver circuit responsive to the first activation signal supplied from the first activation signal producing circuit for capturing an indication signal for indicating an input signal capture cycle in which an input signal is to be captured, said first receiver circuit outputting an internal signal when the indication signal is captured;
- a second activation signal producing circuit for producing a second activation signal responsive to the internal signal supplied from the first receiver circuit, said second activation signal producing circuit producing the second activation signal during an interval when the internal signal is supplied;
- and
- a second receiver circuit for capturing the input signal responsive to the second activation signal supplied from the second activation signal producing circuit.
2 more elements
Dependencies are inferred from the claim text.