USB

USB Type-C v1.3 (CC layer)

An independent clean-room USB Type-C CC attach-layer VIP: a source port that presents Rp and sequences VBUS/VCONN…

shippingGroup USBStandard USB-IF USB Type-C Cable and Connector Specification v1.3 — CC attach layer

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.

An independent clean-room USB Type-C CC attach-layer VIP: a source port that presents Rp and sequences VBUS/VCONN, a separately written sink port that measures the CC pin and decodes its current budget through ITS OWN threshold table, and a passive CC checker (“typec/, make typec_oss, 28/28 checks). Covers attach debounce, orientation in both directions, powered-cable Ra and VCONN placement, detach, and the Rp current advertisement. Six rules, each with an injected fault that fires that rule specifically — the checker exposes a per-rule mask, because a test asserting only that the violation count moved can pass on a different rule than the one it claims to exercise. SCOPE: the CC layer only. PD messaging over CC is vip-usb-pd; Alternate Mode, Billboard and the USB data pairs are out of scope; CC voltages are NOMINAL band centres from a resolution table, not a circuit. The sharpest result is a NEGATIVE one, and it is physical. Before any PD contract exists a sink learns its current budget by measuring a voltage and deciding which band it falls in — no message, no acknowledgement, nothing to confirm the partner agreed. T8 advertises USB default power to a sink whose thresholds are shifted: it reads the same pin as 3.0 A and draws 3.3x its budget while terminations, voltages, orientation, debounce and VBUS sequencing are all correct. The checker is blind by construction, and no rule could fix it — the advertisement is a resistor, and agreement about what a resistor means is an assumption, not a handshake.

Key Features

Source and sink CC state machines, independently written (not one inverting the other)
Rp advertisement + sink-side band decode with device-owned thresholds as parameters
Attach debounce, orientation (normal and flipped), powered-cable Ra, VCONN placement, detach
Passive checker, 6 rules, each pinned by a per-rule mask to its own injected fault
The threshold-disagreement blind spot named and asserted, not papered over

Standards & Compliance

USB-IF USB Type-C Cable and Connector Specification v1.3 — CC attach layer

Interested in the USB Type-C v1.3 (CC layer) VIP?

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

Talk to us →See related VIP

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.

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