Timesintelli PT153S: Fully Domestic RISC-V Gigabit USB Ethernet Controller

Overview

USB Gigabit Ethernet controllers are a classic "small but hard" category. A single chip must combine a capable CPU, a complex network protocol stack, and high-speed mixed-signal PHYs — and the market has long been dominated by a handful of international vendors. On August 13, 2026, Timesintelli presented the PT153S, a chip that targets this gap with a self-developed RISC-V core as the "control brain" and a fully domestic supply chain from design through packaging.

Timesintelli (时擎智能科技（上海）有限公司) was founded in 2018 and is headquartered in Shanghai Zhangjiang. It is one of the earliest Chinese teams working on RISC-V processors, with a portfolio spanning RISC-V cores, edge-AI accelerators, and custom ASICs. Its previous products — the AT1K/AT820 edge voice AI chips and the AT5K edge vision AI chips — all share the same self-developed RISC-V technology base. The PT153S is the company's first entry into high-speed interface chips.

Key Specifications

Parameter	Value
CPU Core	Self-developed 32-bit RISC-V (RV32IMAC), up to 187.5 MHz
USB Interface	USB 3.2 Gen1 device controller + PHY, 5 Gbps, SS/HS/FS modes
USB Endpoints	5 physical endpoints, dynamic FIFO allocation
Ethernet	10/100/1000M auto-negotiation, integrated MAC + PHY
Checksum Offload	TCP/UDP/IPv4/IPv6 hardware checksum offload
Network Features	802.1Q VLAN, 802.3az EEE, IEEE 1588v1/v2 PTP
Power Modes	Normal / Powersaving / Sleep (as low as 10 mW)
Wake-on-LAN	Magic packet, wakeup frame, link-change wake
Power Management	Integrated LDO + DC-DC (minimal external BOM)
Memory	SiP 1 Mb Flash
Package	QFN40, 5 mm x 5 mm
ESD Protection	HBM 4 kV, cable-side 10 kV
Temperature	-40 degC to +85 degC (streaming validated)

Why RISC-V — "Small Core, Big Connectivity"

Rather than treating RISC-V as a generic MCU replacement, Timesintelli uses the core for four persistent control duties:

• USB protocol & enumeration: device enumeration, descriptor parsing, and network-class protocol response.
• Ethernet link management: gigabit auto-negotiation, link-state monitoring, and TX/RX scheduling.
• Power & low-power management: USB suspend/resume, energy-saving state machines, and Wake-on-LAN.
• Firmware evolution: online upgrade, production calibration, and customer-specific customization.

Because USB device compatibility is an ongoing issue — firmware is never "done once" — the core's flexibility matters. Timesintelli went a step further than the standard ISA: it added targeted custom instruction extensions for high-frequency operations such as checksum acceleration, packet processing, wake-pattern matching, and byte-order swap. Combined with RISC-V's royalty-free licensing and trim-ability, these extensions let the chip reach commercially competitive PPA (performance, power, area).

Measured Performance vs. Leading Competitors

In the same test environment, Timesintelli benchmarked the PT153S against a leading market competitor using iperf:

Metric	PT153S	Competitor
TCP unidirectional peak	949 Mb/s	958 Mb/s
UDP unidirectional peak	941-942 Mb/s	942 Mb/s
Chip temperature (1 hr full load)	~52 degC	comparable
Whole-card power (bidirectional)	0.78 W	comparable

Both chips effectively reach the ~950 Mb/s practical ceiling of Gigabit Ethernet. The PT153S is pin-compatible with the leading competitor, meaning customers can drop it into existing hardware without redesigning the PCB or adjusting peripheral components — cutting replacement cycles from months to days.

Driverless, Cross-Platform Compatibility

The PT153S enumerates as a standard network class device, so it works out of the box (driverless) across a wide range of operating systems. It has completed 24-hour stability validation on more than 20 mainstream platforms, including Windows 7/10/11, Ubuntu, CentOS, and macOS. Android and HarmonyOS are also ready, and gaming-console support is expected within 3-6 months.

Development & Validation Example

A typical bring-up on Linux requires no custom driver — the device enumerates via the standard CDC-NCM class:

# 1. Confirm driverless enumeration (SuperSpeed device)
$ lsusb
Bus 002 Device 003: ID <vid>:<pid> Timesintelli PT153S Gigabit Ethernet

# 2. Check kernel binding (CDC-NCM / cdc_ether)
$ dmesg | tail -n 6
[  +0.00s] usb 2-1: new SuperSpeed USB device number 3
[  +0.12s] cdc_ncm 2-1:2.0: usb0: register 'CDC NCM' at usb-0000:00:14.0-1
[  +0.20s] usb0: 1000 Mbit/s Full Duplex, link ok

# 3. Validate Gigabit throughput (iperf3)
$ iperf3 -c 192.168.1.1 -t 30
[SUM]   0.00-30.00  sec  3.31 GBytes   949 Mbits/sec   sender

# 4. Confirm VLAN + checksum offload capabilities
$ ethtool -k usb0 | grep -E 'tx-checksum|rx-vlan|tx-vlan'
tx-checksumming: on
rx-vlan-offload: on
tx-vlan-offload: on

For embedded and industrial designs, the integrated LDO/DC-DC and SiP Flash keep the external bill of materials minimal, while the -40 to +85 degC streaming validation and 4 kV/10 kV ESD ratings target industrial and enterprise deployment.

Market Trajectory: 1M Units in 3 Months

The PT153S launched in December 2025 and reached 1 million units shipped within three months of achieving mass-production readiness. Qiu Jianle contrasted this with the company's edge-AI chips, which took roughly a year to reach the same volume: "We worked hard on edge-AI chips and didn't reach one million in a year, but an interface chip reached one million in three months." The chip targets USB Gigabit dongles, docking stations/hubs, PC peripherals, and embedded industrial motherboards — a "small but beautiful" market where correct positioning enables rapid scale.

Official Resources

• Timesintelli Official Website
• EET-China — PT153S Launch Report (CN)
• MyDrivers — PT153S Announcement (CN)
• EDN China — 3 Months to 1M Units Analysis (CN)