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ADSP-2186
TIMING PARAMETERS
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.
1
1
1
2
IACK
t
IKR
IS
IRD
t
IRDE
IAD 15–0
t
IRDV
Figure 23. IDMA Read, Long Read Cycle
2
3
4
t
IKHR
t
IRP
t
IKDS
PREVIOUS
READ
DATA
DATA
t
IRDH
–26–
Min
Max
0
15
15
0.5 t
– 10
CK
0
10
0
15
2 t
– 5
CK
t
– 5
CK
t
IKDH
t
IKDD
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
REV. 0
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