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IEEE 488.2 Controller Chip
National Instruments
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com/gpib
7
Decode
A23-0
D15-0
74573
74573
Interrupt
Control
D15-0
A23-0
IPL2-0
RESET
DTACKN
UDSN
R/WN
ASN
LDSN
74245
A0
D7-0
CE*
A2
A1
RESET*
INT*
UDSN
LDSN
R/WN
ASN
UAS
OWN
DBEN
DDIR
RDYN
DTACKN
A23/D15 - A8/D0
A7-A1
A3
A2
A1
DBIN
WE*
GND
OSC
CLK
DRQ
ACK
ACCRQ*
ACCGR*
68440
CPU(68000)
DRQ
RD*
WR*
INT0
ACCRQ*
DBIN
WE*
INT*
DEN
DT/R
AD15-0
D7-0
A2
A1
A0
RESET
RESET*
CE*
D7-0
A15-0
74573
OSC
CLK
A1
A2
A3
ACCGR*
CPU(80186)
NAT9914
D8
D7
D6
D5
D4
D3
D2
D1
NDAC
NRFD
REN
IFC
DAV
EOI
ATN
SRQ
TE
TE
PE
DC
TE
CONT*
75162
75160
DIO8
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
GPIB
REN
NDAC
NRFD
DAV
EOI
ATN
SRQ
D8
D7
D6
D5
D4
D3
D2
D1
NDAC
NRFD
REN
IFC
DAV
EOI
ATN
SRQ
TE
TE
PE
DC
TE
CONT*
75162
75160
DIO8
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
GPIB
REN
NDAC
NRFD
DAV
EOI
ATN
SRQ
IFC
NAT9914
SC
+5 V
SC
+5 V
Othe r
DTA CK Sources
+5 V
+5 V
IFC
Decode
74245
Figure 13. Typical CPU Systems with NAT9914