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DP5380V Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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DP5380V Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 32 page  TLF9756 May 1989 DP5380 Asynchronous SCSI Interface (ASI) General Description The DP5380 ASI is a CMOS device designed to provide a low cost high performance Small Computer Systems Inter- face It complies with the ANS X3131-1986 SCSI standard as defined by the ANSI X3T92 committee It can act as both INITIATOR and TARGET making it suitable for any application The ASI supports selection reselection arbitra- tion and all other bus phases High-current open-drain driv- ers on chip reduce application chip count by interfacing di- rect to the SCSI bus An on-chip oscillator provides all tim- ing delays The DP5380 is pin and program compatible with the NMOS NCR5380 device NCR5380 or AM5380 applications can use it with no changes to hardware or software The DP5380 is available in a 40-pin DIP or a 44-pin PCC The ASI is intended to be used in a microprocessor based application and achieves maximum performance with a DMA controller The device is controlled by reading and writing several internal registers A standard non-multi- plexed address and data bus easily fits any mP environment Data transfers can be performed by programmed-IO pseu- do-DMA or via a DMA controller The ASI easily interfaces to a DMA controller using normal or Block Mode The ASI can be used in either a polled or interrupt-driven environ- ment Features SCSI Interface Y Supports TARGET and INITIATOR roles Y Parity generation with optional checking Y Arbitration support Y Direct controlmonitoring of all SCSI signals Y High current outputs drive SCSI bus directly Y Faster and improved timing Y Very low SCSI bus loading mP Interface Y Memory or IO-mapped control transfers Y Programmed-IO or DMA data transfers Y Normal or Block-mode DMA Y Fast DMA handshake timing Connection Diagram TLF9756 – 1 Table of Contents 10 FUNCTIONAL DESCRIPTION 20 PIN DESCRIPTION 30 REGISTER DESCRIPTION 40 DEVICE OPERATION 50 INTERRUPTS 60 RESET CONDITIONS 70 APPLICATION GUIDE 80 ABSOLUTE MAXIMUM RATINGS 90 DC ELECTRICAL CHARACTERISTICS 100 AC ELECTRICAL CHARACTERISTICS A1 FLOWCHARTS A2 REGISTER CHART TRI-STATE is a registered trademark of National Semiconductor Corporation PAL is a registered trademark of and used under license from Monolithic Memories Inc C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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