Electronic Design

Embedded Systems

RAID PMC Module Offers One Ultra2 SCSI Channel
The PMC57 RAID PMC module is designed for a wide range of reliable storage systems where a redundant array of independent disks (RAID) is required. It can be hosted on a CompactPCI board to provide fault-tolerant storage and maximum data availability for high-performance embedded systems.

The PMC module has one 68-pin VHDLCI connector. Also, it supports one Ultra2 low voltage differential (LVD) SCSI channel with up to 15 wide and seven nonwide SCSI devices each. LVD doubles the maximum burst transfer rates to 80 Mbytes/s and provides differential data integrity. Also, it provides easy system configuration for up to 15 devices. Multiple RAID levels optimize performance and fault tolerance. The designer can select the desired combination of storage capacity, data availability, and I/O transfer performance. Supported RAID levels include 0, 1, 3, 5, 10, 30, and 50.

The PMC57 supports Windows NT v3.51/v4.x, Novell NetWare 3.1x/4.x/
5.0, IBM OS/2.2x Warp/v3.0/ v4.x, Sun Solaris x86, Linux Red Hat v5.2, SCO Unix Open server 3.x/5.x, and UnixWare 2.x. The board also supports industry standards for predicting drive failure and for management of non-SCSI devices in the server cabinet. It supports a wide range of SCSI devices.

Available now, the PMC57 RAID controller costs $1327.

Cyclone Microsystems, 25 Science Pk., New Haven, CT 06511; (203) 786-5536; www.cyclone.com.

SBC Features An Intel Flexible Socket 370 Package
The CBU single-board computer (SBC) has a dual SCSI interface, which supports both Ultra160 and legacy drives without sacrificing transfer rates. The design features an Intel flexible Socket 370 package. It has dual Ethernet interfaces, providing the flexibility of independent channels for dual network applications.

With the Intel 440BX AGP set and on-board video, this SBC ensures long life. Optionally, a CBU with a 440GX AGP set offers up to 1 Gbyte of memory. It is available with either a Pentium III or Celeron processor. The SBC features dual PCI EIDE Ultra DMA/33 interfaces capable of supporting up to four IDE type 4 disk drives. A synchronous DMA mode transfers up to 33 Mbytes/s. The two DIMM sockets support auto detection of synchronous SDRAM up to 1 Gbyte. The dual SCSI interfaces support two simultaneously operating channels and burst data to the host at speeds up to 160 Mbytes/s. Also, simultaneous initiator and target mode operation is supported.

Other features include dual 10/
100Base-T interfaces and an AGP Super VGA video interface with up to 4 Mbytes of display memory. Also included are two high-speed independently programmable FIFO serial ports, a floppy interface, a parallel port, a PS/2 mouse port, a keyboard port, and two USB 1.0 ports. The CBU complies with the PCI Local Bus 2.1 and PICMG 2.0 specifications.

With a Pentium III processor, the CBU starts at $2004. With a Celeron processor, pricing begins at $1684.

Trenton Technology Inc., 2350 Centennial Dr., Gainesville, GA 30504; (800) 875-6031; fax (770) 287-3150; Internet: www.trentonprocessors.com.

Six-Port Bypass Circuit Supports Both 1.0625- And 2.125-Gbit/s Rates
The VSC7147 six-port bypass circuit suits the growing 2.125-Gbit/s Fibre Channel storage market. The device supports both 1.0625- and 2.125-Gbit/s Fibre Channel data rates. According to the company, it enables manufacturers of Fibre Channel disk arrays, just a bunch of disks (JBODs), and storage subsystem equipment to integrate more ports and disk drives while maintaining signal quality.

The device features dual Fibre Timer TM repeater/retimer cells. Each contains an all-digital clock recovery unit that can be configured as either a repeater or a retimer. In repeater mode, recovered data is retransmitted to a recovered clock to improve jitter attenuation and low latency. In the retimer mode, recovered data is retransmitted synchronously to a local reference clock with no jitter transfer.

In 1000-unit quantities, the VSC7147 costs $21.81.

Vitesse Semiconductor Corp., 488 Schooley's Mt. Rd., Hasting's Commons, Bldg. 1B, Hackettstown, NJ 07840; (909) 979-0990; fax (909) 979-0992; Internet: www.vitesse.com.

P Serial Communications Modules Suit Processor Boards With IP Sites
The IP Communication modules can be used on processor boards with IP sites, including the XVME-660 or carrier boards. The XVME-9660 6U carrier board (four IP modules per board) or the XVME-9630 3U carrier board (two IP modules per card) can be used to place the IP modules on the VME bus.

Two types of IP Communication modules are available for either RS-232 or RS-422/485 serial communications. Both boards offer programmable baud rates, unique interrupt vectors for each channel, and RTS and CTS handshake lines. Line-break and false start-bit detection enable more reliable serial communications. Handshake lines on each channel simplify the use of modems.

The XIP-4520 offers eight channels of RS-232 serial communications with 64 bytes of transmit FIFO buffers and 64 bytes of receive FIFO buffers. It can be programmed for a baud rate of up to 230 kbits/s. The XIP-4521 offers the same feature set as the XIP-4520 but with eight channels of RS-422/485 serial communication. It uses socketed termination and bias resistors. Also, it is capable of programmable baud rates up to 921.6 kbits/s. Both boards use an industry-standard 16C544 family UART that includes a software 16C450 mode of operation.

For pricing and availability information, contact the company.

Xycom Automation Inc., 750 N. Maple Rd., Saline, MI 48176-1292; (734) 429-4971; fax (734) 429-1010; Internet: www.xycomautomation.com.

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