PM8056 Chip SAS Expander from PMC Sierra

1. PM8056 Chip
PMC’s SAS (Serial Attached SCSI)
Expander
Devanshu Shrivastava
Physical Design Staff Engr.
(PMC Sierra)

2. SAS Overview
Devanshu Shrivastava

3. SAS Overview
• Serial Attached SCSI (SAS), brings more flexible storage solutions to end
users and storage/systems integrators in a variety of ways. SAS meets both
enterprise and midrange/nearline storage requirements at relatively low
costs, providing users and integrators with flexible storage architectures.
• Unlike its parallel SCSI predecessors, the SAS protocol provides a tunneling
mechanism for delivering SATA frames through SAS connection
infrastructures, including physical cabling connections. These
interchangeable drive and cable connectors ensure “plug and play”
between both SAS and SATA targets (hard disk drives, DVD drives, tape,
etc.). Similarly, protocol and connection compatibility allows OEMs to
easily configure storage systems for multiple markets by simply altering
disk drive options and characteristics. A single SAS enclosure or server can
be configured to support enterprise and/or midrange/nearline
applications. In addition, end users can easily configure or update systems
by swapping high-performance SAS drives and low-cost SATA drives as
appropriate.
Devanshu Shrivastava

4. SAS Overview
• Serialization of the SCSI interface overcomes the physical and functional
limitations of parallel interface technology. Increased bandwidth
requirements, as well as challenges presented by clock skew and power
consumption, prevented SCSI from moving beyond the Ultra320
specification. Serialization addresses the parallel interface limitations
while significantly reducing power consumption. SAS leverages
technologies prevalent in other serial interfaces, including SATA, Gigabit
Ethernet, and Fibre Channel.
Devanshu Shrivastava

5. SAS Expander Overview
SAS Expander performs a data switching function between multiple hosts and target devices
Devanshu Shrivastava

6. SXP SAS Expander Chip Family
Devanshu Shrivastava

7. SXP SAS Expander Chip Family
• SXP 12G expanders
The SXP 12G expanders leverage PMC's advanced
silicon integration techniques and leading-edge
mixed signal design to deliver the industry's highest
port density and best-in-class signal integrity.
– PM8053: SXP 12G 24-port SAS/SATA expander
– PM8054: SXP 12G 36-port SAS/SATA expander
– PM8055: SXP 12G 48-port SAS/SATA expander
– PM8056: SXP 12G 68-port SAS/SATA expander
Devanshu Shrivastava

8. PM8056 Device
• Product Overview
• The PM8056 SXP 68x12G device is a 68-port SAS expander that features
T10 zoning, self-configuration, table-to-table routing, an Ethernet port,
and an integrated MIPS processor for SES and enclosure management
support. Applications for the SXP 68x12G include SAS/SATA JBODs and
RBODs, high-density SAS HBAs and RAID controllers, SAS switches, server
backplanes, and HDD/SSD expansion for enterprise servers.
• Benefits
• Implements SAS 3.0 T10 zoning for secure storage and guaranteed
interoperability
• Ultra low switching latency for improved system performance
• Table-to-table routing removes need for keyed connectors
• Integrated Ethernet port for seamless interface to management entity
• Integrated MIPS processor for enclosure management
• Firmware compatible with PMC's 6Gbps and 3Gbps expander products
Devanshu Shrivastava

9. PM8056 Application
• Typical Applications include:
• Server Storage JBODs and RBODs SAS Switches
High Density HBAs and RAID Controllers
Devanshu Shrivastava

10. End of Presentation
Devanshu Shrivastava