MM-5425CN 2GB 64-bit/66MHz Battery-Backed PCI NVRAM Card FEATURES Capacity: 256MB, 512MB, 1GB and 2GB Two on-board redundant lithium ion batteries Half length PCI card with 64-bit/66MHz PCI 2.2 interface Transfer Rate: Up to 533 MB/s Specialized Mailbox DMA for maximizing read and write transfers Error Detection and Correction Supports interrupts Synchronous Device drivers for several operating systems available Reliability with The MM-5425CN is designed to improve response time and data Asynchronous reliability in server appliances. Performance Especially applicable to file servers and storage appliances that adhere to the NFS protocol or utilize journaling file systems, PCI NVRAM cards can enable these products to improve performance for I/O intensive applications and still comply with the industry standard benchmark, SPEC SFS. SPEC SFS requires following the NFS protocol, which ensures reliability by making many operations synchro- nous. While this is an excellent method towards guaranteeing reliability, there is an associated performance penalty. This penalty is greatest when hard disk drive(s) are selected as the stable storage device. The MM-5425CN minimizes this performance penalty by replacing disk accesses with SDRAM memory accesses; SDRAM memory accesses are usually millions of times faster than disk accesses. Unlike NVRAM that resides on a storage controller, PCI NVRAM can be completely controlled by the host that is also controlling the file system. In addition, PCI NVRAM provides superior performance to NVRAM on external storage controllers for synchronous writes because it is effectively accessed at the system level and only limited by bus speeds. NVRAM on external storage devices is accessed indirectly with SCSI commands and limited by the significant overhead of a cable interconnect. Several journaling file systems now provide external journal mounts, so the journal log (metadata) can easily be placed on a separate device. Due to the nature of journal updates which often involve small, frequent writes where disk performance is at its lowest, a high speed PCI NVRAM card can be used as the device for the journal log. MM-5425CN Some journaling file systems also have a mode in which all data is journaled, including metadata and actual file data. These systems provide an additional level of data protection, but this usually comes at the expense of increased disk operations. Using a PCI NVRAM device increases system performance and maintains or improves data reliability while providing protection of data as well as consistency of the file system. In addition to providing burst transfer rates of up to 533 MB/s, the MM-5425CN's PCI interface and memory controller have been specifically designed to minimize latency for these applications. DMA chaining is supported and instead of just generating an interrupt after a transfer, the mailbox DMA can write a semaphore to the host memory when the transfer is complete so the host does not have to poll the status of the DMA. Redundant, rechargeable lithium ion batteries are on-board to provide data retention in the event of a power loss. Status LED lights are software programmable and battery status registers in the CSR can be enabled to monitor battery voltages. These features and several others along with the battery failover circuitry are the result of supplying leading OEMs non-volatile memory cards based on open system buses since 1976. SPECIFICATIONS Parameter Specification Capacity 256MB, 512MB, 1GB, 2GB Compatibility PCI Local Bus Specification Rev. 2.2 Burst Mode Transfer Rate Up to 533 MB/s Bus Mastering DMA Initiator and Target capabilities Interrupts Supports Interrupts Data Integrity Error detection and correction for all single-bit errors and detection for double-bit errors. Batteries Two 1.2 Amp/hr (each) lithium ion rechargeable Battery Shelf Life 5 years Charging Current Rate 1,000 mAh Operating Temperature 0° to +70° C Storage Temperature -40° to +85° C Relative Humidity Up to 95% without condensation Power Requirements Standby: 675mA @ +5V, 350mA @ +3.3V Operate: 1.32A @ +5V, 350mA @ +3.3V (max) not including battery charge Power Consumption 3.5A @ +5V (worst case, during a burst while battery is recharging) Power Dissipation 8.82W (worst case) Warranty One Year Parts and Service All trademarks and registered trademarks are the property of their respective owners. Specifications are subject to change without notice. Micro Memory reserves the right to make changes to improve reliability, function, or design. Micro Memory does not assume any liability arising from the application of this product. Contact Micro Memory, LLC. 9540 Vassar Ave. • Chatsworth  CA  U.S.A.  91311 • Tel 818 998 0070  Fax 818 998 4459 www.umem.com  sales@umem.com