PCIe SAS and SATA ICs

Introduction to PCIe SAS and SATA ICs.PCIe (Peripheral Component Interconnect Express) refers to interface control ICs that comply with the high-speed serial computer expansion bus standard, and it is one of the most widely adopted core IC types in the current high-performance storage device sector. Leveraging the point-to-point serial connection architecture of the PCIe bus, PCIe ICs support multi-lane parallel transmission. The technology has evolved from the early PCIe 3.0 to the current mainstream PCIe 4.0, and then to the progressively commercialized PCIe 5.0; single-lane bandwidth has increased from 8 GT/s to 32 GT/s, and when paired with an x16 link configuration, a total bandwidth exceeding 100 GB/s can be achieved, which fully unlocks the performance potential of NVMe-based SSDs. These ICs are primarily integrated into solid-state drive controllers, and are also deployed as standalone expansion controllers on PCIe add-in cards and server motherboards. They are responsible for protocol parsing, data routing, and signal conversion between the host and storage devices. With ultra-low latency and extremely high throughput, they satisfy the stringent storage speed requirements of application scenarios including gaming consoles, data centers, and artificial intelligence training.

SAS (Serial Attached SCSI) refers to interface control ICs complying with the Serial Attached SCSI standard, and is a specialized storage interface chip targeting enterprise-level servers and storage system fields. SAS ICs are backward compatible with SATA devices. On the basis of retaining the enterprise-level features of the traditional SCSI protocol, including command queuing, multi-device addressing, and error logging, SAS replaces parallel transmission with serial transmission, which solves the inherent signal interference problem of parallel SCSI. The transmission rate has also increased steadily from the initial 3 Gbps of the first generation to the current 24 Gbps of SAS 4.0. These ICs generally support multi-port expansion, allowing a single controller to connect to dozens of storage devices. They also feature hardware-level fault tolerance and hot-swapping capabilities, which can meet the requirement of 7×24-hour continuous operation in enterprise-level scenarios. They are mainly applied in server hard disk controllers, JBOD storage enclosures, enterprise-level hard disk drives and solid-state drives. Their core advantages lie in stability, scalability, and operation and maintenance flexibility, making them well-suited for the construction of large-capacity storage clusters in data centers.

SATA (Serial Advanced Technology Attachment) refers to interface control ICs complying with the Serial ATA standard, and is the most widely adopted interface chip in the consumer storage field. SATA technology replaced the earlier Parallel ATA interface, with its transmission rate evolving from 1.5 Gbps of the original SATA 1.0 to 6 Gbps of the current mainstream SATA 3.0, which can meet the bandwidth requirements of the vast majority of consumer-grade hard disk drives and entry-level solid-state drives. SATA ICs feature a simple architecture and low cost, with a mature and stable protocol that supports hot swapping. Widely deployed as storage interfaces in desktop personal computers, laptops, and consumer-grade NAS devices, they are responsible for SATA protocol parsing and data exchange between the host and storage devices. Although PCIe NVMe SSDs have become the mainstream product in the high-performance storage field, SATA ICs still hold a large market share in the fields of traditional hard disk drives and entry-level storage devices by virtue of their extremely low cost and mature industrial ecosystem, and can effectively meet the application requirements of scenarios with relatively low demand for storage speed, such as general office work and home storage.