Analog Devices ADSP-2181 Manual page 29

ADSP-2181
Parameter
IDMA Read, Long Read Cycle
Timing Requirements:
t IACK Low before Start of Read
IKR
t Duration of Read
IRP
Switching Characteristics:
t IACK High after Start of Read
IKHR
t IAD15–0 Data Setup before IACK Low
IKDS
t IAD15–0 Data Hold after End of Read
IKDH
t IAD15–0 Data Disabled after End of Read
IKDD
t IAD15–0 Previous Data Enabled after Start of Read
IRDE
t IAD15–0 Previous Data Valid after Start of Read
IRDV
t IAD15–0 Previous Data Hold after Start of Read (DM/PM1)
IRDH1
t IAD15–0 Previous Data Hold after Start of Read (PM2)
IRDH2
ADSP-2183
Parameter
IDMA Read, Long Read Cycle
Timing Requirements:
t IACK Low before Start of Read
IKR
t Duration of Read
IRP
Switching Characteristics:
t IACK High after Start of Read
IKHR
t IAD15–0 Data Setup before IACK Low
IKDS
t IAD15–0 Data Hold after End of Read
IKDH
t IAD15–0 Data Disabled after End of Read
IKDD
t IAD15–0 Previous Data Enabled after Start of Read
IRDE
t IAD15–0 Previous Data Valid after Start of Read
IRDV
t IAD15–0 Previous Data Hold after Start of Read (DM/PM1)
IRDH1
t IAD15–0 Previous Data Hold after Start of Read (PM2)
IRDH2
NOTES
1
Start of Read = IS Low and IRD Low.
2
End of Read = IS High or IRD High.
3
DM read or first half of PM read.
4
Second half of PM read.
REV. 0
1
1
2
1
1
2
IACK
t
t
IKR
IS
IRD
t
IRDE
IAD 15–0
t
IRDV
Figure 31. IDMA Read, Long Read Cycle
2
3
4
2
3
4
IKHR
t
IRP
t
IKDS
PREVIOUS READ
DATA DATA
t
IRDH
–29–
ADSP-2181/ADSP-2183
Min Max
0
15
15
0.5t –10
CK
0
10
0
15
2t –5
CK
t –5
CK
28.8 MHz
Min Max
0
15
17
0.5t –10
CK
0
10
0
15
2t –5
CK
t –5
CK
t
IKDH
t
IKDD
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns