JMB391 Datasheet PDF - JMicron


Part Number JMB391
Description RAID Port Multiplier Chip
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JMB391 RAID Port Multiplier Chip
1. Overview
JMicron JMB391 is a single chip, 1 to 5-ports Serial ATA II Port Multiplier with RAID function support.
It is designed to provide SATA port expansion, data protection and performance aggregation at various
JMB391 uses JMicron’s production-proven Multi-port Serial ATA PHY technology and
JMicron-proprietary storage processor to provide very high efficient SATA RAID operation. With an easy
configuration scheme, the device can be a pure port multiplier which provides SATA port expansion just like
a SATA 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. JMB391 also has advance mode to provide both benefit of performance boost and data protection.
JMB391 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 system and
external storage applications
2. Compliance & Features
2.1 Compliance
Compliant with Serial ATA II Port
Multiplier Spec. Revision 1.1
Compliant with Serial ATA II PHY
Electrical Spec. Revision 1.0
Compliant with Serial ATA High Speed
Serialized AT Attachment Spec. Revision
2.3 SATA
Supports 6-port 3.0Gbps SATA II
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
Supports spread spectrum clocking
Supports partial / slumber power saving
2.2 General
Integrated 6-port SATA II PHY
Integrated PLL for SATA II interface
Total six independent SATA channel
Integrated uP, PROM and SRAM for
firmware programming
Integrated high performance RAID
storage processor
Fabricated in 0.13um CMOS Standard
Logic Process
1.3V core and 3.3V I/O power supply
Available in 64-pin QFN
Automatically speed negotiation for 3
Gbps or 1.5 Gbps
Supports BIST and loopback mode
Supports staggered spin-up
Supports 48-bit LBA addressing
Supports ATAPI drives
Supports Native Command Queue (NCQ)
Supports Hot-Plug
Supports Asynchronous Notification
Supports PM aware and non-PM aware
Copyright © 2008 JMicron Inc. All rights reserved.
Product Brief
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2.4 RAID
Fully hardware-accelerated RAID Engine
No driver, BIOS or software required for
RAID operation
No external DRAM or processor required
for RAID operation
Independent of device SATA port
connection sequence
Supports RAID levels: 0 / 1 / 10 / JBOD
SATA In-band application interface
Supports more than 2Tera Bytes RAID
Supports on-line command based bad
sector recovery
Supports on-line Auto-Rebuild
Rebuild speed: 200GB/hour
Rebuild proceed continuously between
power cycling
Supports various RAID configuration and
monitoring method
2.5 GPIO
Supports 15 GPIOs
Supports I2C interface
Supports ISA interface
Supports SPI interface
Supports LED indicators
3. Functional Description
JMB391 is a highly integrated single chip. It integrates five high-speed Serial I/O’s, five 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, JMB391 can be used as SATA port
multiplier, RAID or disk clone system. The following paragraph describes each functional block in detail.
3.1 Block Diagram
Figure 3.1 Function View of JMB391
Copyright © 2008 JMicron Inc. All rights reserved.
Product Brief
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