An overview: ASM2464PD is the chip of Xiangshuo (USB4/Thunderbolt to PCIe Gen4 x4 NVMe Bridge Controller), a new generation of USB4/Thunderbolt to PCIe/NVMe accessory controller, which is built on the PHYs designed by ASMedia. USB4/Thunderbolt technology enables PCIe and USB protocols to be encapsulated into the USB4/Thunderbolt structure and cross the USB4/Thunderbolt 3.0 realm.
The ASM2464PD can be implemented in various types of storage devices, such as portable SSDs, SSD enclosures and any other PCIe-based storage products, which can be used to expand storage capacity through high-speed data transmission. The ASM2464PD USB connector is capable of providing USB4/Thunderbolt 20Gbps x2 speed data rate, and is also compatible with existing legacy USB 3.2 interfaces and Thunderbolt 3.
In addition, the downstream port link of ASM2464PD is also upgraded to PCIe Gen4 x4 to support various NVM Express-based M.2, CFexpress and U.2. ASM2464PD integrates USB4/Thunderbolt Gen3 x2, and PCI Express Gen4 with 1.8V and 1.05V voltage power supply. The USB Type-C CC logic circuit is integrated with BMC PHY, supports cable positioning, flipping and PD receiving mode, and can communicate through PD protocol, including USB4/TBT3 transmission and reception.
Two features:
A: General features
1, USB4/Thunderbolt transfer to PCIE and NVMe SSD chips.
2. Integrates two USB 20Gbps PHYs.
3. Integrate UFP CC logic protocol for USB-C cable positioning and detection.
4. Integrate BMC PHY to fix 5V UFP/launch mode for PD.
5. 3.3V/1.8V/1.05V DC power supply.
6. Support SPI and external ROM interface to customize RAM code.
7. Support I2C and GPIOs and UART interface.
8. Passive crystal oscillator 25HZ.
B: USB Universal Serial Bus function
1, supports up to USB4/Thunderbolt Gen3 x2 with USB 3.2 and USB2.0 (backward compatible).
2. Support BOT and UAS protocols.
3. Support USB link power management. ,
4, Support USB hot plug. ,
5. Support spread spectrum clock control.
6. Support UNMAP command set.
7. Support SCSI vendor specific command set.
8. Compliant with the Universal Serial Bus 4 (USB4™) specification version. 1.0 (including interoperability with Thunderbolt™ 3 (TBT3) systems) with compliance to the Universal Serial Bus Type-C Cable and Connector Specification version 2.1 and compliance with the Universal Serial Bus Power Delivery Specification 3.1 version 1.3.
C: PCIE function description
1, supports PCIE GEN4x4.
2, Support PCIE NVMe SSD.
3, Support spread spectrum clock control.
4, 100 MHz differential reference clock output.
5. Support various types of PCIE sockets, including M.2, U.2 and CF Express.
6, Support power management of PCIE link.
7, Compliant with PCIE Basic Specification Version 4.0 and PCIe M.2 Specification Version 1.1.
D: NVM fast function
1, support NVMe power management.
2, Support NVMe: SCSI translation reference version.
3, 1.5 Support NVMe error reporting and recovery.
4, SMART drive monitoring.
5, Compliant with NVM protocol basic specification revision 1.4c
Three packages: Package 10x10 mm2 FCCSP (green lead-free). RoHS compliance.
Four structure diagrams:
Five-part reference materials:
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