Datapath
Enable an agent to recognise a hardware datapath, record how it moves and transforms data, assess its operating state, and determine which operations or configuration changes are supported.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 16 findings · 26 questions
Data contract The datapath boundary and the meaning of data entering, leaving and residing within it.
Ports and boundary
The endpoints and containment decisions that define this datapath.
Bounded data function
Record the hardware function, its operand and result endpoints, and which nearby storage or processing resources belong inside the boundary.
- Which operand inputs, result outputs and internal resources define this datapath's hardware function? boundary
- Are register files, load/store interfaces and address-generation resources inside this datapath or owned by neighbouring models? boundary
Value semantics
Widths, encodings and interpretation rules along each data route.
Representation and conversion
Record operand, intermediate and result representations, including conversion and exceptional-result rules where applicable.
- What widths, signedness, numeric formats and lane arrangements apply at each processing boundary? measurement
- How are extension, truncation, rounding, saturation and overflow handled for each supported operation? definition
Processing and routing The hardware resources and connections that realise data operations.
Operation resources
Available transformations and their mapping to physical resources.
Supported transformations
Record the operations implemented by each resource and the restrictions imposed by shared hardware.
- Which arithmetic, logical, shift, comparison, selection or specialised operations does each resource implement? definition
- Which requested operations can execute concurrently, and which require sequencing because they share a resource? action
Connectivity and selection
Operand sourcing, intermediate transfers and result destinations.
Legal data routes
Record selectable connections, write destinations and any feedback or bypass routes.
- Which sources can reach each processing input and storage destination through the available selectors and interconnects? definition
- Which route selections cause contention, unsupported feedback or an invalid destination write? action
Control and data lifecycle How control signals initiate operations and govern the validity of stored and moving data.
Control interface
The contract between sequencing logic and datapath resources.
Control-to-operation mapping
Record the meanings and legal combinations of operation selects, route selects, enables and completion signals.
- Which control signals select transformations, choose operand routes and enable state updates? definition
- What control sequence legally accepts operands, performs the operation and makes the result available? action
Validity and interruption
Data ownership and validity during normal execution and interrupted progress.
In-flight data handling
Record how valid data is distinguished from stale contents and what happens when execution stalls or is interrupted.
- How are operand acceptance, intermediate validity and result consumption represented, including backpressure where present? definition
- What happens to pending writes and in-flight results during stall, flush, reset or cancellation, where supported? action
Timing and execution capacity The temporal organisation and constraints governing useful data processing.
Execution organisation
Stage boundaries, repeated resource use and dependencies between operations.
Stages and dependencies
Record combinational regions, state boundaries and any mechanisms for resolving operand or resource dependencies.
- Where are the state or handshake boundaries, and which operations traverse or revisit each processing region? definition
- When do dependencies require a stall, bypass, arbitration decision or additional execution step? action
Performance envelope
Latency, acceptance rate and timing limits under explicit conditions.
Conditional timing capacity
Record performance with its operation mix, configuration, implementation and operating assumptions.
- What are latency and initiation interval for each supported operation, and how do stalls or variable-duration operations change them? measurement
- What evidence establishes the clock or handshake timing limits, and for which voltage, temperature and implementation conditions? provenance
Implementation and assurance The implementation evidence and checks needed to judge whether the datapath behaves as specified.
Realisation and domains
Implementation identity and dependencies on clock, reset and power arrangements.
Implementation operating contract
Record the hardware realisation, relevant revision and domain constraints that affect data transfer or retention.
- Which specification, RTL, netlist or hardware revision establishes the resource and routing arrangement being assessed? provenance
- Which clock, reset or power-domain transitions require synchronisation, isolation, draining or reinitialisation? action
Correctness and fault response
Evidence for correct transformations and the handling of erroneous data movement or computation.
Verification and diagnosis
Record checked invariants, observable error indications and supported responses to detected faults.
- Which simulation, formal, timing or hardware-test results verify operation semantics, route selection and state updates? provenance
- Which corruption, illegal-control or timing failures are detectable, and what recovery or containment actions are supported? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of Datapath this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these kinds and varieties hold for the sense of Datapath this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of Datapath this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these typical measurements hold for the sense of Datapath this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of Datapath this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of Datapath this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.OBJ
What it is Filled
A datapath is the interconnected hardware in a digital system that stores, transfers and transforms data through components such as registers, arithmetic and logic units, multiplexers and buses under the direction of control signals.
In scope
- Data inputs, outputs, internal storage and processing boundaries
- Arithmetic, logical, selection and data-transfer resources
- Internal connectivity, operand routing and resource sharing
- Control interfaces, sequencing and data-validity conditions
- Timing, throughput, implementation constraints and fault behaviour
Out of scope
- The complete processor, accelerator or system containing the datapath
- Control-unit implementation and instruction decoding beyond their interface to the datapath
- Instruction-set semantics beyond the operations mapped onto this datapath
- Software workflows and abstract data-processing pipelines without a hardware realisation
- Network forwarding paths unless the registry specifically intends that meaning
- External memory, peripherals and power supplies beyond their interface constraints
Why it exists Filled
Enable an agent to recognise a hardware datapath, record how it moves and transforms data, assess its operating state, and determine which operations or configuration changes are supported.
Distinguishing features Filled
- Its boundary identifies hardware resources that store, select, transfer or transform data, rather than merely specifying an algorithm.
- It exposes data-bearing routes and operations; a control unit primarily determines which of those operations occur and when.
- Its identity follows the connected data-processing arrangement rather than the complete processor, which can include control, memory management and other subsystems.
- A bus or link alone primarily provides transport; a datapath describes the arrangement through which a bounded hardware function processes data, potentially including transport-only stages.
- A pipeline describes a staged execution arrangement; a datapath can be pipelined, combinational or sequenced through shared resources.
What robots and AI may and may not do Filled
Must not
- Alter a datapath in a safety-critical or security-critical processor design without review and verification.
- Present an unverified design as correct.
- Hide known faults, such as overflow or timing errors, from the design's users.
- Copy a proprietary design without the owner's permission.
Only with a human decision
- Releasing a changed design for manufacture.
- Deciding to ship hardware with a known datapath defect.
May
- Describe the parts of a datapath and how data moves through it in a given design.
- Check a datapath design against its specification with simulation on systems the agent may change.
Moral aspects Filled
- Hardware errors are hard to fix after manufacture and can affect many users at once.
- Datapath flaws can leak private data between programs.
Who is affected
- Users of the hardware
- Design owners
- Engineers
Owners Filled
Steward
The designer or company that owns the design.
Links to other meta-models Filled
parent
- Q11653 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.datapath
- Wikidata: Q1633673 (https://www.wikidata.org/wiki/Q1633673)
Direct properties required Filled
- Hardware role: processor execution, accelerator processing, signal processing, other documented role
- Data representation: bit vector, signed integer, unsigned integer, fixed point, floating point, packed lanes, other specified encoding
- Operand and result widths: bits, recorded separately for each port, resource and intermediate value
- Processing resources: contained arithmetic units, logic units, shifters, selectors, registers and implementation-specific resources
- Routing topology: directed connections between ports, selectors, storage and processing resources
- Sequencing architecture: combinational, single-cycle, multicycle, pipelined, asynchronous, hybrid
- Operation latency: clock cycles and/or seconds, by operation and stated conditions
- Initiation interval: clock cycles or seconds between accepted operations under stated conditions
- Execution and validity state: implementation-defined combinations of idle, active, stalled, draining, reset and faulted, with validity per storage element or stage
- Clock, reset and power dependencies: associated domains, crossing mechanisms, reset sources and power-state constraints
Recognition required Filled
- In a diagram, registers, arithmetic units, multiplexers and buses connected by data lines.
- In a chip, not visible directly; its layout is known from design files.
Capabilities and actions required Filled
- Trace an operand through selected storage, routing and processing resources to its result.
- Check whether a requested operation and data representation are supported.
- Determine compatible control settings and operation sequences from documented constraints.
- Estimate latency and acceptance rate for a specified workload and operating configuration.
- Assess whether a stall, reset, flush or reconfiguration preserves or invalidates in-flight data.
- Select verification checks and localise faults using expected versus observed data movement.
Hazards and failure modes required Filled
- Arithmetic or overflow errors producing wrong results.
- Timing faults at high clock speeds.
- Side channels that leak data between processes.
Standards and interfaces required Filled
- IEEE 754, issued by the Institute of Electrical and Electronics Engineers, specifies floating-point arithmetic behavior for datapaths designed to implement its numerical formats and operations.
Context of use required Filled
- A datapath is used inside processors and other digital systems to move, store and transform data under control signals.
- Engineers examine datapaths when designing arithmetic operations, instruction execution, pipelining and hardware performance.
Sources Filled
- Wikidata item Q1633673: Datapath - identity and sense of the item
- Wikipedia: Datapath - general description of the item
Open questions
- Does the registry intend the digital hardware meaning of datapath, a network forwarding datapath, or another meaning? No definition is recorded.
- Does an existing Vercy world model already cover this concept, requiring a registry link instead of a separate publication?
- Should the intended boundary include address generation, register files and load/store machinery, or only the operand-processing core?
- Which authoritative sources should establish the terminology and the treatment of synchronous, asynchronous and reconfigurable implementations?
- Which interface standards or assurance requirements apply to specific datapath implementations, rather than to the containing device or system?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q1633673/spec.json