JMB322 Datasheet PDF - JMicron


Part Number JMB322
Description RAID Port Multiplier
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JMB322 RAID Port Multiplier
The JMicron JMB322 is a single chip, 1 to 2-port Serial ATA II Port Multiplier with RAID function
support. It is designed to provide SATA port expansion, data protection and performance aggregation at
various applications.
The device uses JMicron’s production-proven Multi-port Serial ATA PHY technology and
JMicron-proprietary storage processor to provide very high efficient RAID operation. With an easy
configuration scheme, the device can be a pure port multiplier which provides SATA port expansion
just like USB Hub, or hard-drive performance booster which provides a high performance device seen
by host controller or hard-drive data protector which automatically backup data to prevent data loss
from hard-drive damage.
The JMB322 is a self-contained storage processor chip which completely frees up the main CPU
loading and the SATA ports comply with eSATA specification, making it suitable for use in both
internal and external applications.
Compliant with Serial ATA II Port
Multiplier Spec. Revision 1.2
Compliant with Serial ATA II Port Selector
Spec. Revision 1.0
Compliant with Serial ATA II PHY
Electrical Spec. Revision 1.0
Compliant with Serial ATA II High Speed
Serialized AT Attachment Spec. Revision 2.5
Integrated 3-port SATA II PHY
Integrated PLL for SATA II interface
Total three independent SATA channel
Integrated uP, PROM and SRAM for
firmware programming
Integrated high performance RAID processor
Fabricated 0.13um CMOS Standard Logic
1.3V core and 3.3V I/O power supply
Available in 48-pin QFN
Supports 3-port 3.0Gbps SATA II interface
Supports SATA II Gen2i and Gen2m
(External SATA Connection, eSATA)
Output swing control and automatic
impedance calibration for SATA II PHY
Supports asynchronous signal recovery
Automatically speed negotiation for 3 Gbps
or 1.5 Gbps
Supports staggered spin-up
Supports 48-bit LBA addressing
Supports ATAPI drives
Supports Hot-Plug
Supports Asynchronous Notification
Supports PM aware and non-PM aware host
Fully hardware-accelerated RAID Engine
No driver, BIOS or software required for
Copyright © 2009 JMicron Technology Corp. All rights reserved.
Product Brief
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RAID operation
No external DRAM or processor required for
RAID operation
Independent of device SATA port connection
Supports RAID: 0(Stripe) / 1(Mirror) /
SATA In-band application interface
Supports more than 2Tera Bytes RAID drive
Supports on-line command based bad sector
Supports on-line Auto-Rebuild
Rebuild speed: 200GB/hour
Rebuild proceed continuously between power
Supports Hot Spare on RAID
Supports various RAID configuration and
monitoring method
Supports 15 GPIOs
Supports I2C interface
Supports ISA interface
Supports SPI interface
Only for mother board application
Copyright © 2009 JMicron Technology Corp. All rights reserved.
Product Brief
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Functional Description
JMB322 is a highly integrated single chip. It integrates three high-speed Serial I/O’s, three SATA
upper layers, a high-performance RAID engine, a microprocessor, SRAM, PROM, a high efficient data
bus and other control logic into the chip. With proper firmware programming, JMB322 can be used as
SATA port multiplier, RAID or disk clone system. The following paragraph describes each functional
block in detail.
Block Diagram
Function View of JMB322
Supporting Document
1 Product Brief
2 Data Sheet
3 Hardware Design Guide
4 Application Schematic
Contact Information
Tech. Support
Copyright © 2009 JMicron Technology Corp. All rights reserved.
Product Brief
Page 3
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