Unigen Interposer Product

Flash Interposers SAS to SATA Interposer


Parameter Description
Single Chip Solution Marvell 88SF9110
6Gb/s SAS Target Port 2
6Gb/s SATA Host Port 1
SAS 2.0 Compliant Support SSP and SAT‐2 industry specification
SATA 3.0 Compliant 6 Gb/s SATA PHY with speed negotiation to backward support 3 and 1.5 Gb/s
Concurrent IOs per Chip 128
Multiple SAS Initiators Up to 32 SAS initiators
Nave Command Queuing 32 outstanding commands per SATA host port for high performance
Sector Size Translation Translate non‐512 byte sector size
T10 Protetion Information Model Protection information fields can be verified, inserted, or deleted from the data stream
Diagnostic Capabilities Including Send Diagnostic, Mode Select, Mode Sense
Error Handling Well‐defined Link layer and Transport layer error handling
Online FW Upgrade Upgradable via Marvell GUI‐based FW utility
SPI Flash Interface External flash containing configuration data and firmware code
Mechanical 2.700 x 0.561 inch / 68.70 x 14.25mm
Power Consumption 1.10W


SATA devices and native SAS devices are significantly different. SATA devices are inherently single‐port, half‐duplex and designed to operate with a single host, while SAS devices are dual ports, full duplex, and often assigned to operate with multiple hosts concurrently.

In order to make a SATA device respond like a SAS device that is capable of receiving commands across both ports simultaneously (from multiple hosts if necessary) a more sophisticated interposer is required.

This class of device is called a SAS to SATA bridge or Interposer, which presents itself to the host as a native SAS device. These devices have proven to be popular in applications where the preference is for the lower cost‐per‐gigabyte SATA drives, while maintaining all of the system‐level benefits of native SAS connectivity.

The Unigen SAS to SATA Interposer is in full compliance with SAS 6Gb/s, 3Gb/s and SATA 6Gb/s. 3Gb/s. It is designed with the Marvell 88SF9110, 6Gb/s SAS to SATA bridge to produce maximum performance with speed negotiation and signal retiming/reconditioning.

Contact Unigen for Datasheets

Phone: 510-896-1818

Email: sales@unigen.com

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