Inside
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Single-Ended to Differential SCSI Converter ChipsetProduct Features
Texas Instruments now offers a 16-bit solution, an adaptation
of the industry’s first 9-channel RS-485 transceiver, to
convert single-ended SCSI to differential SCSI without host or
target controller intervention. The SN75LBC970A Control Transceiver
and SN75LBC971A Data Transceiver chipset can cost-effectively
provide the advantages of differential transmission to SCSI peripherals
or hosts that currently do not have differential support from
their protocol controllers.
The chipset is well-suited for scenarios where the number of SCSI devices or the distance between them exceeds the capabilities of the single-end interface. The predominant applications are in high-end computing systems such as file and video servers, workstations, minicomputers, and mainframes with peripherals including tape, optical, rigid magnetic disk drives, etc. Single-ended to differential Wide Fast-SCSI bus can be achieved with just three devices, two data chips and one control chip. The generic block diagram shows this implementation. The chipset provides the exceptional electrical performance of differential SCSI from a single-end SCSI bus controller. Using the standard nine SCSI control signals, the SN75LBC970A Control Transceiver decodes the state of the bus, and enables the SN75LBC971A Data Transceiver(s) to transmit the single-ended SCSI signals differentially to the cable or receive the differential cable signals and drive the single-ended outputs to the controller. For improved performance and increased system reliability, the devices also offer the following protection:
Both devices are offered in a 56-pin SSOP package.
Vol 19, October, 1996 |
