ADSP-218xN Series
IDMA Read, Long Read Cycle
Table 24. IDMA Read, Long Read Cycle
Parameter
Min
Max
Unit
Timing Requirements:
t
IKR
IACK Low before Start of Read
1
t
IRK
End of read after IACK Low
2
Switching Characteristics:
t
IKHR
IACK High after Start of Read
1
t
IKDS
IAD15鈥? Data Setup before IACK Low
t
IKDH
IAD15 鈥? Data Hold after End of Read
2
t
IKDD
IAD15鈥? Data Disabled after End of Read
2
t
IRDE
IAD15鈥? Previous Data Enabled after Start of Read
t
IRDV
IAD15鈥? Previous Data Valid after Start of Read
t
IRDH1
IAD15鈥? Previous Data Hold after Start of Read (DM/PM1)
3
IAD15鈥? Previous Data Hold after Start of Read (PM2)
4
t
IRDH2
1
Start
2
End
0
2
10
0.5t
CK
鈥?3
0
10
0
11
2t
CK
鈥?5
t
CK
鈥?5
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
of Read = IS Low and IRD Low.
of Read = IS High or IRD High.
3
DM read or first half of PM read.
4
Second half of PM read.
IACK
t
IKR
IS
t
iKHR
t
IRK
IRD
t
IRDE
IAD15鈥?
PREVIOUS
DATA
t
IKDS
READ
DATA
t
IKDH
t
IRDV
t
IRDH1 OR
t
IRDH2
t
iKDD
Figure 33. IDMA Read, Long Read Cycle
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