ADSP-2181
P aram eter
Min
Max
Unit
ID MA Read, Long Read Cycle
Timing Requirements:
tIKR
tIRP
IACK Low before Start of Read1
Duration of Read
0
15
ns
ns
Switching Characteristics:
tIKHR
tIKDS
tIKDH
tIKDD
tIRDE
tIRDV
tIRDH1
tIRDH2
IACK High after Start of Read1
15
ns
ns
ns
ns
ns
ns
ns
ns
IAD15–0 Data Setup before IACK Low
0.5tCK – 10
0
IAD15–0 Data Hold after End of Read2
IAD15–0 Data Disabled after End of Read2
12
15
IAD15–0 Previous Data Enabled after Start of Read
IAD15–0 Previous Data Valid after Start of Read
IAD15–0 Previous Data Hold after Start of Read (DM/PM1)3
IAD15–0 Previous Data Hold after Start of Read (PM2)4
0
2tCK – 5
tCK – 5
NOT ES
1Start of Read = IS Low and IRD Low.
2End of Read = IS High or IRD High.
3DM read or first half of PM read.
4Second half of PM read.
IACK
IS
tIKHR
tIKR
tIRP
IRD
tIKDH
tIKDS
tIRDE
PREVIOUS
DATA
READ
DATA
IAD15–0
tIRDV
tIKDD
tIRDH
Figure 17. IDMA Read, Long Read Cycle
REV. D
–23–
ADI [ ADI ]
