ADSP-218xN
IDMA Write, Long Write Cycle
Table 23. IDMA Write, Long Write Cycle
Parameter
Min
Max
Timing Requirements:
tIKW
IACK Low Before Start of Write1
tIKSU
IAD15–0 Data Setup Before End of Write2, 3, 4
tIKH
IAD15–0 Data Hold After End of Write2, 3, 4
Switching Characteristics:
0
0.5tCK + 5
0
tIKLW
Start of Write to IACK Low4
tIKHW
Start of Write to IACK High
1.5tCK
10
1 Start of Write = IS Low and IWR Low.
2 If Write Pulse ends before IACK Low, use specifications tIDSU, tIDH.
3 If Write Pulse ends after IACK Low, use specifications tIKSU, tIKH.
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.
Unit
ns
ns
ns
ns
ns
IACK
IS
tIK W
tIKH W
tIK LW
IWR
IAD15 –0
tI K SU
DATA
tIK H
Figure 34. IDMA Write, Long Write Cycle
Rev. A | Page 36 of 48 | August 2006