Automotive Networking

PTP / gPTP

Standalone verification of tsn_switch’s tick_i time-sync watchdog: the independent checker tracks its own sync-timeout counter from the observed tick_i strobe and SYNC_TMO register writes…

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shippingGroup Automotive NetworkingStandard IEEE 1588 (PTP), 802.1AS (gPTP)

Available now — real, tested verification collateral, not a roadmap placeholder.

Verification IP is not safety-rated. These are testbench components — no ASIL target, no FMEDA, no IP-XACT, no safety-mechanism interface. They exist to help you verify a design, not to carry a safety argument. The safety soft-IP catalog is over here.

The deliverable

What you get

Bus-functional model

An independent driver for the protocol, written clean-room from the public specification — not derived from our own RTL, so it is a genuine second source.

Passive protocol checker

A monitor that watches the bus and asserts the spec’s rules continuously, so a violation fails the run where it happens rather than downstream.

Self-checking interop testbench

A one-command testbench that drives the model against real RTL and hard-checks the result — reproduce every claim on day one.

Standalone verification of tsn_switch‘s tick_i time-sync watchdog: the independent checker tracks its own sync-timeout counter from the observed tick_i strobe and SYNC_TMO register writes, matching the documented contract. The interop TB withholds tick_i past a small configured SYNC_TMO and confirms the DUT raises the ISR[SYNC_TIMEOUT] bit and a safety_monitor fault with err_code==4. This is the switch’s own gPTP-proxy watchdog, not a full PTP/gPTP protocol exchange — Sync/Follow_Up/Delay_Req/Delay_Resp message framing and Best Master Clock Algorithm scenarios are NOT modeled (tsn_switch has no PTP message-layer logic of its own, only the tick_i strobe input) and remain roadmap for a dedicated PTP endpoint IP.

Key Features

Independent sync-timeout watchdog model (its own counter, gated on the real tick_i pin + observed SYNC_TMO writes) mirroring the DUT’s documented time-sync contract
Interop TB withholds tick_i past a small SYNC_TMO and confirms ISR[SYNC_TIMEOUT] plus the shared safety_monitor’s err_valid/err_code==4 fault
Confirms gates are force-CLOSED and forwarding is unaffected via TAS-disable fallback while sync-timed-out (fail-safe behavior)
No Sync/Follow_Up/Delay_Req/Delay_Resp message exchange or BMCA — tsn_switch only consumes a pre-synchronized tick_i strobe, not a PTP endpoint — roadmap

Standards & Compliance

IEEE 1588 (PTP), 802.1AS (gPTP)

Pairs With

Built to lean against these catalog IPs during integration:

tsn_switch

Interested in the PTP / gPTP VIP?

Deliverables, the file manifest, and licensing terms are shared under a mutual NDA.

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Verification IP is testbench collateral and is deliberately not safety-rated: no ASIL target, no FMEDA, and no IP-XACT descriptor. It carries no functional-safety claim.

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