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DP5380V Datasheet

  • DP5380V

  • Asynchronous SCSI Interface (ASI)

  • 32頁

  • NSC

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DP5380 Asynchronous SCSI Interface (ASI)
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 X3 131-1986 SCSI standard
as defined by the ANSI X3T9 2 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-I O 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
Y
Y
Y
Y
Y
Y
Y
SCSI Interface
Supports TARGET and INITIATOR roles
Parity generation with optional checking
Arbitration support
Direct control monitoring of all SCSI signals
High current outputs drive SCSI bus directly
Faster and improved timing
Very low SCSI bus loading
mP
Interface
Memory or I O-mapped control transfers
Programmed-I O or DMA data transfers
Normal or Block-mode DMA
Fast DMA handshake timing
Y
Y
Y
Y
Connection Diagram
Table of Contents
1 0 FUNCTIONAL DESCRIPTION
2 0 PIN DESCRIPTION
3 0 REGISTER DESCRIPTION
4 0 DEVICE OPERATION
5 0 INTERRUPTS
6 0 RESET CONDITIONS
7 0 APPLICATION GUIDE
8 0 ABSOLUTE MAXIMUM RATINGS
9 0 DC ELECTRICAL CHARACTERISTICS
10 0 AC ELECTRICAL CHARACTERISTICS
A1 FLOWCHARTS
A2 REGISTER CHART
TL F 9756 鈥?1
TRI-STATE is a registered trademark of National Semiconductor Corporation
PAL is a registered trademark of and used under license from Monolithic Memories Inc
C
1995 National Semiconductor Corporation
TL F 9756
RRD-B30M115 Printed in U S A

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