Datasheet

Rev. C | Page 32 of 48 | January 2008
ADSP-2184L/ADSP-2185L/ADSP-2186L/ADSP-2187L
IDMA Write, Long Write Cycle
Table 22. IDMA Write, Long Write Cycle
Parameter Min Max Unit
Timing Requirements:
t
IKW
IACK Low Before Start of Write
1
0ns
t
IKSU
IAD15–0 Data Setup Before End of Write
2, 3, 4
0.5t
CK
+ 10 ns
t
IKH
IAD15–0 Data Hold After End of Write
2, 3, 4
2ns
Switching Characteristics:
t
IKLW
Start of Write to IACK Low
4
1.5t
CK
ns
t
IKHW
Start of Write to IACK High
5
17 ns
1
Start of Write = IS Low and IWR Low.
2
If Write Pulse ends before IACK Low, use specifications t
IDSU
, t
IDH
.
3
If Write Pulse ends after IACK Low, use specifications t
IKSU
, t
IKH
.
4
This is the earliest time for IACK Low from Start of Write. For IDMA Write cycle relationships, please refer to the ADSP-2100 Family User’s Manual.
5
For the ADSP-2185L, and the ADSP-2187L, this specification is 4 ns min., and 15 ns max.
Figure 24. IDMA Write, Long Write Cycle
IAD15– 0
DATA
t
IKHW
t
IK W
IAC K
IS
IWR
t
IK LW
t
IK H
t
IKSU