ADSP-2181
–23–
REV. D
Parameter Min Max Unit
IDMA Read, Long Read Cycle
Timing Requirements:
t
IKR
IACK Low before Start of Read
1
0ns
t
IRP
Duration of Read 15 ns
Switching Characteristics:
t
IKHR
IACK High after Start of Read
1
15 ns
t
IKDS
IAD15–0 Data Setup before IACK Low 0.5t
CK
– 10 ns
t
IKDH
IAD15–0 Data Hold after End of Read
2
0ns
t
IKDD
IAD15–0 Data Disabled after End of Read
2
12 ns
t
IRDE
IAD15–0 Previous Data Enabled after Start of Read 0 ns
t
IRDV
IAD15–0 Previous Data Valid after Start of Read 15 ns
t
IRDH1
IAD15–0 Previous Data Hold after Start of Read (DM/PM1)
3
2t
CK
– 5 ns
t
IRDH2
IAD15–0 Previous Data Hold after Start of Read (PM2)
4
t
CK
– 5 ns
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.
t
IRP
t
IKR
PREVIOUS
DATA
READ
DATA
t
IKHR
t
IKDS
t
IRDV
t
IRDH
t
IKDD
t
IRDE
t
IKDH
IAD15–0
IACK
IS
IRD
Figure 17. IDMA Read, Long Read Cycle
