Event-driven readout system with non-priority arbitration for multichannel data sources
An event-driven readout management system includes non-priority access arbitration of a plurality of channels. The system includes an arbitration tree circuit, response circuit, in-channel logic circuit, and output periphery circuit. The arbitration tree circuit determines to which of the plurality of channels to grant access to a common signal transfer resource shared by the plurality of channels based on a readout access request provided by at least one of the plurality of channels. The arbitration tree circuit terminates a prior readout transaction and commences a subsequent readout transaction in response to a single edge of a clock signal. The in-channel logic circuit terminates the prior readout transaction and commences the subsequent readout transaction in response to receiving an acknowledge token. The output periphery circuit converts information received from the plurality of channels into an output format on the common signal transfer resource.
1 . An event-driven readout management system comprising non-priority access arbitration of a plurality of channels, the system comprising:
an arbitration tree circuit, the arbitration tree circuit determining to which of the plurality of channels to grant access to a common signal transfer resource shared by the plurality of channels, the determination being based on a readout access request provided by at least one of the plurality of channels, the arbitration tree circuit excluding simultaneous occurrence of multiple readout access requests from the determination, the readout access request being received by the arbitration tree circuit and stored in the arbitration tree circuit until access is granted to the common signal transfer resource by the arbitration tree circuit, the arbitration tree circuit terminating a prior readout transaction and commencing a subsequent readout transaction in response to a single edge of a clock signal;
a response circuit, the response circuit operatively coupled to the arbitration tree circuit, a state of the clock signal representing an acknowledge token, the acknowledge token being provided to the arbitration tree circuit, the arbitration tree circuit using the acknowledge token to grant access to the common signal transfer resource;
an in-channel logic circuit, the in-channel logic circuit operatively coupled to the arbitration tree circuit, the in-channel logic circuit generating the readout access request and receiving the acknowledge token, the in-channel logic circuit terminating the prior readout transaction and commencing the subsequent readout transaction in response to receiving the acknowledge token; and
an output periphery circuit, the output periphery circuit converting information received from the plurality of channels into an output format on the common signal transfer resource.
2 . The system, as defined by claim 1 , wherein the common signal transfer resource comprises at least one of an analog signal transfer line, a digital signal transfer line.
3 . The system, as defined by claim 1 , wherein the readout access request is generated in response to an event, the event comprising activation of at least one of the plurality of channels to generate transferrable data.
4 . The system, as defined by claim 1 , wherein the readout transaction comprises a plurality of readout phases, at least one of the plurality of readout phases causing transfer of at least a portion of information from one of the plurality of channels to the common signal transfer resource.
5 . The system, as defined by claim 1 , wherein a duty cycle associated with the clock signal is selectable to define an acceptance time associated with the readout access request and to assure settling time associated with the common signal transfer resource.
6 . The system, as defined by claim 1 , wherein the determination further comprises determining, with a plurality of readout phases associated with the readout transaction, which channel of the plurality of channels is granted access to the common signal transfer resource independent of at least one of readout access requests stored in the arbitration tree circuit, readout access requests received, a relative position of the plurality of channels with respect to the arbitration tree circuit.
7 . The system, as defined by claim 1 , wherein a quantity of edges associated with the clock signal is equal to a quantity of readout phases associated with the readout transaction from one channel.
8 . The system, as defined by claim 1 , wherein the arbitration tree circuit operates asynchronously with the plurality of channels.
9 . The system, as defined by claim 1 , wherein the arbitration tree circuit operates synchronously with the output periphery circuit.
10 . The system, as defined by claim 1 , wherein the arbitration tree circuit operates synchronously with the in-channel logic circuit, the in-channel logic circuit operating asynchronously in generating the read access request, the duration of the acknowledge token defining an acceptance time window associated with the read access request for outputting data from at least one of the plurality of channels.
11 . The system, as defined by claim 1 , wherein a duty cycle of the acknowledge token signal is selectable to provide data settling time after granting access to the common signal transfer resource.
12 . The system, as defined by claim 1 , wherein the plurality of channels provides information to the common signal transfer resource such that a transmission order associated with concurrently requesting channels is independent of positions associated with the concurrently requesting channels within the arbitration tree circuit.
13 . The system, as defined by claim 1 , wherein the clock signal comprises a first state and a second state, the first state being defined as active and comprising an acknowledge token that enables new read access requests to be accepted, the second state disabling acceptance of a new read access request to avoid starting data transmission with insufficient data settling time after access is granted to the common signal transfer resource in response to acceptance of the new read access request if the acknowledge token is to be routed to a new channel.
14 . The system, as defined by claim 1 , wherein the readout access requests processed by the arbitration tree circuit comprise logical sums of readout access requests associated with at least one lower stage in the arbitration tree circuit.
15 . The system, as defined by claim 1 , wherein the readout access requests processed by the arbitration tree circuit comprise logical sums of result signals from arbitration between readout access requests.
16 . The system, as defined by claim 1 , wherein the readout access requests processed by the arbitration tree circuit comprise logical sums of result signals from arbitration between results of arbitration between readout access requests, entering arbitration cells, and the clock signal comprising acknowledge tokens in the arbitration cells.
17 . The system, as defined by claim 1 , wherein the readout access requests processed by the arbitration tree circuit comprise logical sums of result signals from arbitration between readout access requests, entering arbitration cells, and the clock signal comprising acknowledge tokens in the arbitration cells.
18 . A method of non-priority arbitration of a plurality of channels using an event-driven readout management system, the method comprising:
determining, using an arbitration tree circuit, to which of the plurality of channels to grant access to a common signal transfer resource shared by the plurality of channels, the determination based on a readout access request provided by at least one of the plurality of channels;
excluding, using the arbitration tree circuit, simultaneous occurrence of multiple readout access requests from the determination;
receiving and storing the readout access requests in the arbitration tree circuit until access is granted to the common signal transfer resource by the arbitration tree circuit;
terminating, using the arbitration tree circuit, a prior readout transaction and commencing a subsequent readout transaction in response to a single edge of a clock signal;
providing an acknowledge token to the arbitration tree circuit, the arbitration tree circuit using the acknowledge token to grant access to the common signal transfer resource, a state of the clock signal representing the acknowledge token;
generating, using an in-channel logic circuit, the readout access request and receiving the acknowledge token, the in-channel logic circuit operatively coupled to the arbitration tree circuit;
terminating, using the in-channel logic circuit, the prior readout transaction and commencing the subsequent readout transaction in response to receiving the acknowledge token; and
converting, using an output periphery circuit, information received from the plurality of channels into an output format on the common signal transfer resource.
19 . A non-transitory computer-readable medium comprising instructions that, when executed by a processing device, perform operations comprising:
determining, using an arbitration tree circuit, to which of the plurality of channels to grant access to a common signal transfer resource shared by the plurality of channels, the determination based on a readout access request provided by at least one of the plurality of channels;
excluding, using the arbitration tree circuit, simultaneous occurrence of multiple readout access requests from the determination;
receiving and storing the readout access requests in the arbitration tree circuit until access is granted to the common signal transfer resource by the arbitration tree circuit;
terminating, using the arbitration tree circuit, a prior readout transaction and commencing a subsequent readout transaction in response to a single edge of a clock signal;
providing an acknowledge token to the arbitration tree circuit, the arbitration tree circuit using the acknowledge token to grant access to the common signal transfer resource, a state of the clock signal representing the acknowledge token;
generating, using an in-channel logic circuit, the readout access request and receiving the acknowledge token, the in-channel logic circuit operatively coupled to the arbitration tree circuit;
terminating, using the in-channel logic circuit, the prior readout transaction and commencing the subsequent readout transaction in response to receiving the acknowledge token; and
converting, using an output periphery circuit, information received from the plurality of channels into an output format on the common signal transfer resource.