Overview
The VSC7158XHT-03, presumed to be a variant of the VSC7170 series from Analog Devices, is a Serial ATA (SATA) multiplexer/buffer designed to enhance data transfer reliability and flexibility in storage systems. This component is likely used in high-availability storage subsystems where redundancy and load sharing are critical.
Key Specifications
| Specification | Value |
|---|---|
| Data Transfer Rate | 1.5 Gbps, 3.0 Gbps |
| Number of SATA Channels | Three independent channels |
| Port Configuration | Supports 1:2 port multiplier and 2:1 port selector configurations |
| Compliance | Conforms to Serial ATA II Port Multiplier Specification Revision 1.1 and Serial ATA II Port Selector Specification Revision 1.0 |
| Power Supply | Single 3.3V, 1.5W typical power |
| Output Preemphasis and Line Equalization | Four levels, configurable by pin |
| Output Swing Amplitude | Two levels, configurable by pin |
Key Features
- Auto negotiation of data transfer rate for each channel
- Supports command and FIS-based switching in port multiplier mode
- No external flash memory required
- Built-in self test (BIST) with diagnostic loopback
- Active-active circuitry allowing multiple initiators in port selector mode
- Optional retimer mode
- Port multiplier control port state machine
- Staggered drive spin-up in port multiplier mode
Applications
- Active-passive or active-active redundant failover systems
- Buffers for externally connected links
- Disk-based backup systems
- Dual-port SAS/STP expander disk arrays using SATA drives
- Dual-port SATA disk arrays (JBODs)
- High-availability, critical data storage systems
- Integration into storage area networks for back-end storage
- NAS servers
- RAID subsystems
Q & A
- What is the primary function of the VSC7158XHT-03?
The primary function is to act as a SATA multiplexer/buffer, providing a 2:1 failover-switch function for 1.5Gbps and 3.0Gbps links. - What are the supported port configurations?
It supports 1:2 port multiplier and 2:1 port selector configurations. - Does it require external flash memory?
No, it does not require external flash memory. - What is the power supply requirement?
It operates on a single 3.3V power supply with a typical power consumption of 1.5W. - What are the key features related to signal integrity?
It includes four levels of output preemphasis, input line equalization, and analog LOS thresholds, all configurable by pin. - Can it support multiple initiators in port selector mode?
Yes, it supports multiple initiators in port selector mode due to its active-active circuitry. - What is the purpose of the built-in self test (BIST)?
The BIST is used for diagnostic loopback and testing the device. - What are some common applications of this component?
Common applications include active-passive or active-active redundant failover systems, disk-based backup systems, and high-availability storage systems. - Does it support SATA asynchronous signal recovery?
Yes, it supports SATA asynchronous signal recovery. - Is spread-spectrum clocking supported?
Yes, it supports spread-spectrum clocking.
