NAT9914APD
NAT9914APL
ACCRQ
t
DU
DAV
NDAC
NRFD
t
WS
t
WH
t
DF
t
DD
t
DR
t
NR
t
DI
ACCGR
DBIN
WE
D7-0
INT/ACCRQ
Figure 7. DMA Write
DBIN
Figure 9. Acceptor Handshake Timing
Source Handshake
Parameter
NDAC↑ to DAV↑
NDAC↑ to INT or ACCRQ
WE
↑
to DAV
WE
↑
to DAV
WE
↑
to DAV
WE
↑
to DAV
↑
↑
↑
↑
Limits (ns)
Symbol Min Max
t
ND
40
t
NI
t
WD
t
WD
t
WD
t
WD
40
Test
Condition
Response to ATN
Parameter
ATN↑ to NRFD
ATN to NDAC
ATN to TE
↑
↑
↑
↑
Symbol
t
AF
t
AN
t
AT
Limits (ns)
Min
Max
35
35
30
Test
Condition
Acceptor handshake
holdoff
AIDS
→
ANRS
TACS
→
TADS
1200 1380 1.1 µs T1, 5MHz
600 780 500 ns T1, 5MHz
400 580 350 ns T1, 5MHz
ATN
WE
t
AT
TE
D7-0
INT/ACCGR
DIO 8-1
t
WD
t
NI
t
AN
NDAC
t
AF
NRFD
DAV
t
ND
NDAC
Parallel Poll
Figure 8. Source Handshake Timing
Parameter
EOI to DIO valid
EOI to TE
↑
EOI
↑
to TE
↑
↑
↑
↑
Symbol
t
ED
t
ET
t
TE
Limits (ns)
Min
Max
90
30
30
Test
Condition
PPSS
→
PPAS
PPSS
→
PPAS
PPAS
→
PPSS
Acceptor Handshake
Limits (ns)
Parameter
DAV to NDAC↑
DAV↑ to NDAC
↑
↑
↑
Symbol Min
t
DD
t
DF
t
DI
t
DR
t
NR
Test
Max
Condition
35+3T
25
50+2T INT(DIIE Bit=1),
ACCGR (DMAI Bit=1)
20
35
Read of DIR, not in
Holdoff state
ATN
EOI
t
TE
DAV to INT or ACCRQ
DAV to NRFD
↑
↑
DBIN↑ to NRFD↑
Note: T=one clock period
TE
DIO
N
ATIONAL
I
NSTRUMENTS
↑
INT(DOIE Bit=1)
ACCGR (DMAO Bit=1)
2000 2180 2 µs T1, 5MHz
↑
↑
↑
↑
Figure 10. ATN Response Timing
t
ET
t
ED
Figure 11. Parallel Poll Response Timing
9
NI [ NATIONAL INSTRUMENTS CORPORATION ]
