Transition signal control unit and DMA controller and transition signal control processor using transition signal control unit

A transition signal control unit, comprising a transition signal control circuit in which a loon for holding a token is created by a plurality of Muller C elements each with an inverter, and gate circuits,

• wherein said transition signal control circuit uses a device request signal DevReq to be input as a clock signal, and
• one of said plurality of Muller C elements with an inverter included in said transition signal control circuit transfers a token being held to a subsequent circuit according to input of the device request signal DevReq or a device response signal DevGrant,
• the transition signal control unit further comprising:
• a first control circuit group constituted by connecting a plurality of said transition signal control circuits;
• a second control circuit group constituted by connecting another plurality of said transition signal control circuits;
• and
• a synchronous circuit which synchronizes said first control circuit group and said second control circuit group.

A transition signal control unit, comprising a transition signal control circuit in which a loon for holding a token is created by a plurality of Muller C elements each with an inverter, and gate circuits,

• wherein said transition signal control circuit uses a device request signal DevReq to be input as a clock signal, and
• one of said plurality of Muller C elements with an inverter included in said transition signal control circuit transfers a token being held to a subsequent circuit according to input of the device request signal DevReq or a device response signal DevGrant,
• the transition signal control unit further comprising:
• a control circuit group constituted by connecting a plurality of said transition signal control circuits;
• a cyclic shift register having an output signal Q2 that sequentially shifts and cycles as synchronized with a clock signal;
• and
• a synchronous circuit which outputs a vector S at a predetermined timing based on a vector Q(Sh) which corresponds to said output signal Q2 to be output from said cyclic shift register, and a response signal AckOut to be output from said control circuit group;
• wherein said control circuit group and said cyclic shift register are synchronized by the vector S to be output from said synchronous circuit to said control circuit group as a second control signal DevReq, and by the response signal AckOut to be output from said control circuit group to said synchronous circuit.

A transition signal control unit, comprising a transition signal control circuit in which a loop for holding a token is created by a plurality of Muller C elements each with an inverter, and gate circuits,

• wherein said transition signal control circuit uses a device request signal DevReq to be input as a clock signal, and
• one of said plurality of Muller C elements with an inverter included in said transition signal control circuit transfers a token being held to a subsequent circuit according to input of the device request signal DevReq or a device response signal DevGrant,
• the transition signal control unit further comprising a counter with reset having input thereto an output signal Q to be output from said transition signal control circuit as a clock, and outputting a count output signal Qc,
• wherein a logic circuit to be a control target is controlled using the output signal Q to be output from said transition signal control circuit or the count output signal Qc to be output from said counter with reset.

A transition signal control unit, comprising a transition signal control circuit in which a loon for holding a token is created by a plurality of Muller C elements each with an inverter, and gate circuits,

• wherein said transition signal control circuit uses a device request signal DevReq to be input as a clock signal, and
• one of said plurality of Muller C elements with an inverter included in said transition signal control circuit transfers a token being held to a subsequent circuit according to input of the device request signal DevReq or a device response signal DevGrant,
• the transition signal control unit comprising:
• a counter with reset having input thereto a first control signal DevGrant to be output from said transition signal control circuit, and outputting a count output signal Qc;
• and
• delay inversion means for delaying the first control signal DevGrant to be output from said transition signal control circuit for a predetermined time, inverting the first control signal DevGrant to generate said second control signal DevReq, and inputting said second control signal DevReq to said transition signal control circuit,
• wherein a logic circuit to be a control target is controlled using the first control signal DevGrant to be output from said transition signal control circuit or the count output signal Qc to be output from said counter with reset.

A transition signal control unit, comprising a transition signal control circuit in which a loop for holding a token is created by a plurality of Muller C elements each with an inverter, and gate circuits,

• wherein said transition signal control circuit uses a device request signal DevReq to be input as a clock signal, and
• one of said plurality of Muller C elements with an inverter included in said transition signal control circuit transfers a token being held to a subsequent circuit according to input of the device request signal DevReq or a device response signal DevGrant,
• the transition signal control unit comprising:
• a first control circuit group constituted by connecting a first plurality of said transition signal control circuits;
• a second control circuit group constituted by connecting a second plurality of said transition signal control circuits;
• a third control circuit group constituted by connecting a third plurality of said transition signal control circuits are connected;
• a first gate circuit;
• and
• a second gate circuit,
• wherein said second control circuit group inputs the request signal ReqOut to be output from a transition signal control circuit in a last stage of said first control circuit group to a transition signal control circuit in a first stage of the second control circuit group as a request signal ReqIn, and inputs the response signal AckOut to be output from a transition signal control circuit in the first stage of said first control circuit group to a transition signal control circuit in a last stage of the second control circuit group as a response signal AckIn;
• said third control circuit group inputs the request signal ReqOut to be output from the transition signal control circuit in the last stage of said first control circuit group to a transition signal control circuit in a first stage of the third control circuit group as the request signal ReqIn, and inputs the response signal AckOut to be output from the transition signal control circuit in the first stage of said first control circuit group to a transition signal control circuit in a last stage of the third control circuit group as the response signal AckIn;
• said first gate circuit has input thereto the response signal AckOut to be output from the transition signal control circuit in the first stage of said second control circuit group and a response signal AckOut to be output from a transition signal control circuit in a first stage of said third control circuit group, determines an AND of these two inputs, and outputs a result of said AND to the transition signal control circuit in the last stage of said first control circuit group as the response signal AckIn;
• and
• said second gate circuit has input thereto a request signal ReqOut to be output from the transition signal control circuit in the last stage of said second control circuit group and a request signal ReqOut to be output from the transition signal control circuit in the last stage of said third control circuit group, determines a second AND of these a corresponding inputs, and outputs a result of said second AND to the transition signal control circuit in the first stage of said first control circuit group as the request signal ReqIn.

A transition signal control unit, comprising a transition signal control circuit in which a loop for holding a token is created by a plurality of Muller C elements each with an inverter, and gate circuits,

• wherein said transition signal control circuit uses a device request signal DevReq to be input as a clock signal, and
• one of said plurality of Muller C elements with an inverter included in said transition signal control circuit transfers a token being held to a subsequent circuit according to input of the device request signal DevReq or a device response signal DevGrant,
• the transition signal control unit comprising:
• a first control circuit group constituted by connecting a plurality of said transition signal control circuits;
• a second control circuit group constituted by connecting another plurality of said transition signal control circuits;
• and
• a switch for switching between a first connecting state and a second connecting state,
• wherein in the first connecting state an output terminal for a request signal ReqOut and an input terminal for a response signal AckIn of a transition signal control circuit in a last stage of said first control circuit group, and an input terminal for a request signal ReqIn and an output terminal for a response signal AckOut of the transition signal control circuit in a first stage of said first control circuit group are connected, and
• in the second connecting state the output terminal for the request signal ReqOut and the input terminal for the response signal AckIn of the transition signal control circuit in the last stage of said first control circuit group, and an input terminal for a request signal ReqIn and an output terminal for a response signal AckOut of a transition signal control circuit in a first stage of said second control circuit group are connected, and an output terminal for a request signal ReqOut and an input terminal for a response signal AckIn of a transition signal control circuit in a last stage of said second control circuit group, and the input terminal for the request signal ReqIn and the output terminal for the response signal AckOut of the transition signal control circuit in the first stage of said first control circuit group are connected.

A transition signal control unit, comprising a transition signal control circuit in which a loop for holding a token is created by a plurality of Muller C elements each with an inverter, and gate circuits,

• wherein said transition signal control circuit uses a device request signal DevReq to be input as a clock signal, and
• one of said plurality of Muller C elements with an inverter included in said transition signal control circuit transfers a token being held to a subsequent circuit according to input of the device request signal DevReq or a device response signal DevGrant,
• the transition signal control unit comprising:
• a control circuit group constituted by connecting a plurality of said transition signal control circuits;
• and
• a switch for switching an input terminal for a request signal ReqIn and an output terminal for a response signal AckOut of a transition signal control circuit in a first stage of said control circuit group, and an output terminal for a request signal ReqOut and an input terminal for a response signal AckIn of a transition signal control circuit in one stage of the plurality of said transition signal control circuits, so as to be a predetermined machine cycle based on a control signal.

A DMA (direct memory access) controller which comprises one or a plurality of DMA channels for holding information for transferring data, an address generation circuit for generating address signals, and a timing and control circuit for generating control signals at a predetermined timing, so as to transfer data among a central processing unit and a plurality of devices connected to a data bus,

• wherein said timing and control circuit further comprises a transition signal control circuit where a loon for holding a token is created using a plurality of Muller C elements each with an inverter, and gate circuits;
• and
• said transition signal control circuit uses a device request signal DevReq to be input as a clock signal, and one of said plurality of Muller C elements with an inverter included in said transition signal control circuit transfers the token being held to a subsequent circuit according to input of the device request signal DevReq or a device response signal DevGrant,
• the DMA controller comprising:
• a control circuit group constituted by connecting a plurality of said transition signal control circuits;
• and
• a logic circuit for executing logic processing of a vector Q(D) corresponding to an output signal Q to be output from said control circuit group and generating said control signals,
• wherein a second control signal DevReq is input to said control circuit group based on control start information from said central processing unit, and said vector Q(D) is output from said control circuit group to said logic circuit.

A DMA (direct memory access) controller which comprises one or a plurality of DMA channels for holding information for transferring data, an address generation circuit for generating address signals, and a timing and control circuit for generating control signals at a predetermined timing, so as to transfer data among a central processing unit and a plurality of devices connected to a data bus,

• wherein said timing and control circuit further comprises a transition signal control circuit where a loop for holding a token is created using a plurality of Muller C elements each with an inverter, and gate circuits;
• and
• said transition signal control circuit uses a device request signal DevReq to be input as a clock signal, and one of said plurality of Muller C elements with an inverter included in said transition signal control circuit transfers the token being held to a subsequent circuit according to input of the device request signal DevReq or a device response signal DevGrant,
• wherein said transition signal control circuit has input thereto a request signal ReqIn, a response signal AckIn, and a second control signal DevReq, and outputs a request signal ReqOut, a response signal AckOut, a first control signal DevGrant and an output signal Q, and
• if said request signal ReqIn is input when said second control signal DevReq is not input and a token is not held, said transition signal control circuit receives said request signal ReqIn as a token and outputs said token as said request signal ReqOut, and if said second control signal DevReq is input, said transition signal control circuit outputs said first control signal DevGrant without outputting said request signal ReqOut and holds said token.

A DMA (direct memory access) controller which comprises one or a plurality of DMA channels for holding information for transferring data, an address generation circuit for generating address signals, and a timing and control circuit for generating control signals at a predetermined timing, so as to transfer data among a central processing unit and a plurality of devices connected to a data bus,

• wherein said timing and control circuit further comprises a transition signal control circuit where a loon for holding a token is created using a plurality of Muller C elements each with an inverter, and gate circuits;
• and
• said transition signal control circuit uses a device request signal DevReq to be input as a clock signal, and one of said plurality of Muller C elements with an inverter included in said transition signal control circuit transfers the token being held to a subsequent circuit according to input of the device request signal DevReq or a device response signal DevGrant,
• the DMA controller comprising a control circuit group constituted by connecting a plurality of said transition signal control circuits in a ring shape so that output of a request signal ReqOut from a transition signal control circuit in a previous stage is input as a request signal ReqIn to a transition signal control circuit in a subsequent stage, and output of a response signal AckOut from said transition signal control circuit in the subsequent stage is input as a response signal AckIn to said transition signal control circuit in the previous stage;
• and
• one of a plurality of said transition signal control circuits holds the token by setting an initial value of a corresponding Muller C element with an inverter.