Display, Imaging & Multimedia

Laser-Dot Centroid Detector

Sub-pixel laser-dot centroids from a camera stream, with an end-to-end conservation check (ISO 26262).

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ASIL-B

target

94.01%

SPFM

99.00%

LFM

PASS

FMEDA

68.4K

gates

1.0.0

version

Interfaces at a glance

Block diagram

The deliverable

What you’re licensing

Sub-pixel laser-dot centroids from a camera stream, with an end-to-end conservation check (ISO 26262). It is delivered as a licensable soft-IP block engineered as an ASIL-B Safety Element out of Context — not just RTL, but the complete functional-safety work package needed to carry it into an ISO 26262 program:

Synthesizable RTL

Portable, vendor-neutral SystemVerilog that drops onto your existing SoC fabric — no foundry or EDA-tool lock-in.

Per-IP FMEDA report

SPFM / LFM / PMHF computed against the ASIL target per ISO 26262-5 — the quantitative analysis your assessor asks for.

Safety manual

Assumptions of use, the safety mechanisms and their diagnostic coverage — written to drop straight into your safety case.

IP-XACT + integration docs

A machine-readable descriptor plus register and integration documentation for fast, low-risk bring-up.

Self-checking testbench

A self-checking testbench and a one-command build, so you can reproduce every claim on day one.

What it is

laser_spot finds the bright laser dots in a monochrome camera frame and reports each dot’s intensity-weighted centroid at sub-pixel resolution, one result per dot, at the end of every frame.

Key Features

Intensity-weighted centroids at sub-pixel resolution (Q12.4 default; FRAC_W parameter)
Single-pass blob tracking: threshold, runs, 8/4-connectivity, attach and merge, 16 slots (N_DOTS)
Conservation check: sum over blobs = independent global totals at frame end (err_code 2)
Multiply-back check on every centroid division + output-register parity (err_code 2)
Reports, never silently drops: dot-table overflow, accumulator overflow, frame overrun (err_code 3)
Coordinate DMR with independent next-state logic (err_code 9), config + per-blob parity (err_code 1), frame timeout (err_code 4)
Formal: bmc + unbounded prove, every mechanism proven two-sided; 15-test Verilator testbench

Standards & Compliance

ISO 26262 (ASIL-B target), AXI4-Stream in/out, APB4 configuration

Functional Safety

ASIL-B (SEooC) · SPFM 94.01% · LFM 99.00% · PASS

ISO 26262:2018 · FMEDA available · Safety Manual included

Register Map

Offset	Register	Description
`0x00`	CTRL	[0]=EN [1]=CONN8 (1 = 8-connectivity, 0 = 4-connectivity) RW
`0x04`	THRESH	[PIX_W-1:0] a pixel is hot when its intensity is strictly greater RW
`0x08`	FRAME_W	[CW-1:0] pixels per line (0 = geometry not checked) RW
`0x0C`	FRAME_H	[CW-1:0] lines per frame (0 = frame ends only on timeout) RW
`0x10`	STATUS	RO [3:0]=err_code [4]=err_valid [5]=OVF [6]=ACC_OVF

…1 more registers — see datasheet for the full table.

Getting Started

// Minimal instantiation
laser_spot #(
 .ADDR_W(6)
) u_laser_spot (
 .clk (clk),
 .rst_n (rst_n),
 // APB4
 .p_paddr (paddr),
 .p_psel (psel),
 .p_penable (penable),
 .p_pwrite (pwrite),
 .p_pwdata (pwdata),
 .p_prdata (prdata),
 .p_pready (pready),
 // Safety
 .err_clear (1'b0),
 .err_valid (err_valid),
 .err_code (err_code)
);

Configure via the CTRL register after reset to enable the IP and set operating parameters. Monitor err_valid / err_code for any safety faults reported by the built-in safety monitor.

Applications

Where it fits

Typically deployed in instrument clusters, camera pipelines, and safety-monitored display paths.

The case

Why license it, not build it

Skip 12–18 months

The FMEDA and the safety case are already generated. You integrate a finished safety element — you don’t stand up a safety-IP program to originate one.

One vendor, one safety story

Every block in the catalog shares the same safety architecture, fault-reaction model, and FMEDA methodology — so subsystems roll up cleanly.

Verified, not vapor

The RTL builds and passes today; the safety metrics come from analysis and fault injection against real RTL, not a datasheet promise.

Interested in Laser-Dot Centroid Detector?

Pricing, the per-IP FMEDA, safety manual, and RTL data room are shared under a mutual NDA.

Talk to us →See related IP

Figures are pre-silicon engineering-grade estimates for a Safety Element out of Context (SEooC); final ASIL sign-off is the integrator’s, supported under NDA. FMEDA and Safety Manual available under NDA.

circuit-design.space · +1-971-357-1400 · anovickis@circuit-design.space