Display, Imaging & Multimedia

AVTP (IEEE 1722) Talker / Listener

IEEE 1722 AVTP talker/listener for automotive TSN Ethernet — presentation-time-accurate, ASIL-B-instrumented, stream-integrity checked.

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ASIL-B

target

93.90%

SPFM

90.00%

LFM

PASS

FMEDA

6.5K

gates

0.1.0

version

Interfaces at a glance

Block diagram

Place-and-route snapshot

Physical implementation

AVTP (IEEE 1722) Talker / Listener routed place-and-route layout on the Nangate45 PDK — A real synthesis and place-and-route pass on this RTL, routed on the open Nangate45 / FreePDK45 PDK — evidence the block closes physically, not just in simulation. Target-PDK timing, area, and power sign-off figures are shared under NDA.

The deliverable

What you’re licensing

IEEE 1722 AVTP talker/listener for automotive TSN Ethernet — presentation-time-accurate, ASIL-B-instrumented, stream-integrity checked. 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

A synthesizable IEEE 1722 AVTP (Audio Video Transport Protocol) talker/listener that frames a media stream into AVTPDUs and releases received AVTPDUs at their gPTP presentation timestamp, giving deterministic, bounded-latency AV delivery over automotive TSN Ethernet.

Key Features

Talker: collects a media stream into AVTPDUs, stamps the presentation timestamp avtp_timestamp = capture_time + MAXTRANSIT from the 802.1AS gptp_time_i input, and emits framed bytes with sof/eof markers to the MAC-TX-like interface
Listener: deframes incoming AVTPDUs and releases samples to the sink exactly at the presentation timestamp — a wrap-safe compare against gptp_time_i holds samples until due and late-drops any PDU overdue past MAXTRANSIT (LATEDROP count)
Stream-conformance checking in hardware: subtype, version, and sequence_num continuity are validated every AVTPDU; a gap, bad subtype, or bad version raises the protocol fault (err_code 3), not silently dropped
SECDED-protected listener payload FIFO (fifo_ecc): single-bit upsets corrected transparently on read; an uncorrectable double-bit upset or pointer-DMR mismatch raises err_code 2
Complementary-DMR shadow on the combined talker+listener framing FSM catches an SEU in either state register (err_code 9)
Even-parity protection on the CTRL/STREAMCFG/MAXTRANSIT config registers (err_code 1), plus a DFT parity-injection input for runtime self-test
APB4 slave register map (CTRL, STATUS, STREAMCFG, MAXTRANSIT, SAMPLE, STREAMID, IER/ISR, ERR, LATEDROP); maskable interrupt; data plane (mac_tx_/mac_rx_) fully separated from the config/status plane

Standards & Compliance

IEEE 1722 (AVTP, AAF subtype), IEEE 802.1AS (gPTP), IEEE 802.1Qbv/Qav (TSN shaping, external), ISO 26262 ASIL-B SEooC (SPFM 93.90%, LFM 90.00%, PMHF 7.45×10⁻⁹/h)

Functional Safety

ASIL-B (SEooC) · SPFM 93.90% · LFM 90.00% · PASS

ISO 26262:2018 · FMEDA available · Safety Manual included

Register Map

Offset	Register	Description
`0x00`	CTRL	0x04 STATUS 0x08 STREAMCFG 0x0C MAXTRANSIT 0x10 SAMPLE
`0x14`	STREAMID_LO	0x18 STREAMID_HI 0x1C IER 0x20 ISR(W1C) 0x24 ERR(W1C)
`0x28`	LATEDROP	(RO) [3]LATE_DROP_PEND [2]SEQ_GAP [1]LISTEN_EN [0]TALK_EN

Getting Started

// Minimal instantiation
avtp #(
 .ADDR_W(6)
) u_avtp (
 .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 AVTP (IEEE 1722) Talker / Listener?

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