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3U, CompactPCI  40MBps Wide Ultra SCSI Hostadapter
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Description Product description in English
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CS1-BRASS - the 'must have' Ultra SCSI hostadapter
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Product Information Product information in PDF format - English
Produktinformation Produktinformation im PDF-Format - Deutsch
Data Sheet PDF Document, Data Sheet CS1-BRASS, English
Download area for drivers
SDMS Software


CompactPCI  Wide Ultra SCSI Hostadapter
40MByte/s Data Transfer Rate

Successfully established as the new standard for modular industrial computers, a wide range of CompactPCI® CPU boards are available from several manufacturers. However, not all of the mainboards are equipped with an on-board SCSI interface.

This gap can be filled by the CS1-BRASS, a universal, CompactPCI® based Wide Ultra SCSI Hostadapter, suitable for controlling of 8- and 16-Bit SCSI peripherals such as harddisks, MO-drives, CD-ROMs, Streamer Tapes, Scanners, Juke-Boxes etc. SCAM (SCSI Configured AutoMatically) as well as PCI plug&play technology care for easy installation and smooth system integration of the CS1-BRASS.

The CS1-BRASS hostadapter is provided with a single ended SCSI-3 interface, offering a data transfer rate of 40MByte/s when operated in the Wide and Ultra modes. Compatibility is maintained to all previous SCSI standards, e.g. asynchronous (SCSI-1) or Fast SCSI. In a coloured environment (simultaneous use of peripherals conforming to different SCSI standards), the data rate in effect is switched to its maximum for any individual device.

The CS1-BRASS allows for connecting to 7 devices with 8-Bit (Narrow) SCSI interface or 15 peripherals with 16-Bit (Wide) connector. Internal and/or external mounting of the devices is at the users choice; the active termination of the CS1 follows any configuration automatically.

CS1-BRASS component assembly

CS1-BRASS Wide Ultra SCSI Hostadapter, Orientation of Connectors

The jumperless board is built around the LSI Logic (Symbios) SYM53C875 PCI-SCSI I/O processor, a high performance, widely accepted industry standard chip. Being also compatible to the popular SYM8751SP hostadapter board, the CS1-BRASS can be used with all Symbios Logic software (e.g. the Device Management System SDMS 4.x), and all existing SYM8751SP drivers for operating systems as Windows9x/NT or Linux are valid also for the CS1-BRASS.

For flexible cabling, the CS1 is provided with three SCSI connectors for internal and external use. Any combination of two of the SCSI connectors can be used together at the same time:

The 68-position SCSI-3 receptacle SCSI_A is mounted to the front panel of the CS1-BRASS. External SCSI devices with 16-Bit Wide interface can be connected directly here (most commonly by a round cable); 8-Bit (Narrow) SCSI peripherals need an adapter (connector or cable) in order to reduce from 68-positions to 50-positions.

The SCSI-3 connector SCSI_B is provided for internal wiring to 16-Bit Wide SCSI devices, mounted within the CompactPCI® rack. This connector typically will be used together with a fine-pitch microribbon flat cable (0.635mm).

Internal 8-Bit SCSI devices can be directly attached to the 50-way header connector SCSI_C, by using a conventional flat cable (1.27mm pitch).

Peripherals, attached to any of the three SCSI connectors, are sensed by a logic circuitry. If the logic detects the CS1-BRASS to be one end of the SCSI bus, the local SCSI terminators are activated. Because the terminators for D0..D7 and D8..D15 are switched individually, also external Wide devices at SCSI A and internal Narrow devices at SCSI C can be used simultaneously. Using all three SCSI connectors together (hub) cannot be allowed while the SCSI topolgy is restricted to a bus structure.

CS1-BRASS - the universal Ultra SCSI hostadapter


The CS1-BRASS contains a Flash Extended BIOS, allowing operating system boot from a SCSI drive. The Flash-EEPROM can be updated at any time by means of a utility program. The CS1-BRASS is additionally provided with a serial EEPROM,

acting as a NVRAM, saving configuration parameters of the board (e.g. for SCAM support).

As a help for installation or fault detection, several LEDs show important board status information:

LED1 SCSI Bus Busy Signal (BSY)
LED2 Flash EEPROM programming (+12V switched on)
LED3 Serial EEPROM read or write cycle
LED4 SCSI line terminator LT1 activated (data bits D8-D15, parity DP1)
LED5 SCSI line terminator LT2 activated (data bits D0-D7, parity DP0, control signals)
LED6 (FP left) SCSI bus TERMPOWER (+4,7V) by internal or external source
LED6 (FP right) SYM53C875 I/O processor activity

The CS1-BRASS sources the voltage for the on-board and external SCSI terminators (TERMPOWER), fused by a Polyswitch (reversible fuse).

SCSI Bus data and control signal integrity will be improved by the SCSI controller chip using the Symbios Tolerant™ filtering technology, thus minimizing the influence of a critical SCSI cabling (poor cables, mixed cable types, noisy environment).

It is not necessary to discuss the advantages of SCSI here, such as superior data throughput at minimal CPU load. With the CS1-BRASS, your CompactPCI® system too can profit from Wide Ultra SCSI performance. The CS1-BRASS is a high reliability, industrial grade product, available at moderate cost, and - last not least - fast and smoothly to be installed.

A toolset already mentioned, but worth to be more intensively discussed is the LSI Logic (Symbios) SCSI Device Management Software SDMS, running on the CC1-BRASS without any modification. SDMS is a package of utilities and drivers, including ASPI, RAID, or removeable media support for popular disk operating systems. As a resident part of the SDMS, basic routines are contained within the on-board Flash Extended BIOS. Like any other BIOS routine, this resident software does not depend on an individual OS, but allows standalone operation and diagnostics instead, e.g. low level harddisk formatting or SCSI bus configuration. In order to obtain current information or download the latest firmware release, the LSI Logic (Symbios) Internet site http://www.lsi.com should be visited.

CS1-BRASS Block Diagram

CS1-BRASS Block Diagram
Technical Specifications
Printed Circuit Board Dimensions 3U Eurocard (100x160mm), front panel width 20.2mm (4HP), mechanics constructed with respect to EMC requirements, ejector lever
SCSI Bus Bus Type 8/16-Bit, Single Ended, max. 7 devices (8-Bit), 15 devices (16-Bit)
Performance Wide Ultra 40MByte/s (16-Bit), Narrow Ultra 20MByte/s (8-Bit)
Wide Fast 20MByte/s (16-Bit), Narrow Fast 10MByte/s (8-Bit)
Asynchronous 14MByte/s
Connector External 68-pos., high density receptacle (metal screen), screw lock 2-56 UNC (SCSI-3)
1. Connector Internal 68-pos. high density socket 90 (Wide)
2. Connector Internal 50-pos. header 2.54mm, 180 (Narrow)
Total SCSI Cable Length SCSI-1 (asynchronous) 6m
Fast SCSI and Wide Fast SCSI 3m
Ultra SCSI and Wide Ultra SCSI 3m (4 devices), 1.5m (8 devices)
Termination active, switched automatically
termination power with Polyswitch (reversible fuse 1.25A)
Controller Chip I/O processor SYM53C875J
pre-fetches of 8 SCRIPTS™ dword instructions minimize PCI bus load
load and store SCRIPTS™ instruction increases performance
includes 4kB internal RAM for SCRIPTS™ instruction storage
optimized block transfers at Ultra SCSI clock rates
536 Byte DMA FIFO
SCAM (SCSI Configured AutoMatically) level 1 functionality
target disconnect/reconnect (interrupt)
Symbios TolerANT™ SCSI signal filtering
Connector J1 PCI 2.1, 32-Bit, 33MHz (133MB/s)
PCI Extended Access Cycles
32-Bit DMA Bus Master (133MB/s)
zero wait state PCI transfers
bursts up to 128 dwords across PCI bus
3.3V or 5V interface
Power Consumption Connector J1 +5V ±5% 1.5A max. (including termination power)
+3.3V ±0.3V 130mA max. (when operating in a 3.3V  VIO slot)
VIO (+5V or +3.3V) 0.1A max
+12V ±5% 50mA max. (when programming Flash EEPROM)
Commercial Grade Version operating temperature 0-70°C
humidity 5-90% non condensing
subject to change without further notice
Ordering Information
Alias Ordering Number Short Description
BRASS CS1-1-BRASS 3U CompactPCI Wide Ultra SCSI Hostadapter
  CR9-1-ADAPT Mechanical kit, expands 3U front panel to 6U
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