Circuit apparatus and system
AssigneeSeiko Epson Corporation
InventorHaruhiko Sogabe
Life of this patent
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Abstract
A circuit apparatus includes an output circuit that outputs a signal to a host apparatus via a bus, and an output control circuit that controls the output circuit. The output circuit has a first conductive transistor provided between an output node and a first power source node, and a second conductive transistor provided between the output node and a second power source node. In a first output mode, the output control circuit controls one of the first conductive transistor and the second conductive transistor to go to off and controls the other transistor to go to on/off, whereas in a second output mode, the output control circuit controls the first conductive transistor to go to on and the second conductive transistor to go to off or vice versa.
Claims15
A circuit apparatus comprising:
- an output circuit that outputs a signal to a host apparatus via a bus;
- an output control circuit that controls the output circuit, and
- a data transfer circuit that transfers data between multiple storage apparatuses connected to a memory connection bus and the host apparatus, wherein the storage apparatus is a storage apparatus provided in a liquid receptacle;
- wherein the output circuit includes:
- a first conductive transistor provided between an output node and a first power source node;
- and
- a second conductive transistor provided between the output node and a second power source node, the output control circuit:
- sets one of the first conductive transistor and the second conductive transistor to off and controls the other transistor on or off in a first output mode;
- and
- sets the first conductive transistor to on and the second conductive transistor to off, or sets the first conductive transistor to off and the second conductive transistor to on, in a second output mode, and
- when the output circuit outputs an output signal to the output node:
- the output control circuit switches from the first output mode, in which the output node is set to a high-impedance state, to the second output mode;
- the output circuit outputs a voltage level corresponding to the output signal to the output node after the second output mode has been set;
- and
- the output control circuit switches the output circuit from the second output mode to the first output mode after the voltage level has been outputted to the output node.
A circuit apparatus comprising:
- an output circuit that outputs a signal to a host apparatus via a bus;
- an output control circuit that controls the output circuit,
- a control unit carrying out output mode setting process;
- and
- wherein the output signal outputted by the output circuit is a busy signal that notifies the host apparatus that a command issued by the host apparatus is currently being processed,
- wherein the control unit includes a register, setting an output mode of the output control circuit based on the value of the register, wherein the output mode comprises of a first and a second output modes, and
- wherein the output circuit includes:
- a first conductive transistor provided between an output node and a first power source node;
- and
- a second conductive transistor provided between the output node and a second power source node,
- the output control circuit:
- sets one of the first conductive transistor and the second conductive transistor to off and controls the other transistor on or off in the first output mode;
- and
- sets the first conductive transistor to on and the second conductive transistor to off, or sets the first conductive transistor to off and the second conductive transistor to on, in the second output mode, and
- when the output circuit outputs the output signal to the output node:
- the control unit switches from the first output mode, in which the output node is set to a high-impedance state, to the second output mode;
- the output circuit outputs a voltage level corresponding to the busy signal to the output node after the second output mode has been set;
- and
- the control unit switches the output circuit from the second output mode to the first output mode after the voltage level has been outputted to the output node.
Dependencies are inferred from the claim text.