adsp2185 Analog Devices, Inc., adsp2185 Datasheet - Page 26

• Manufacturer Part Number: adsp2185
• Description: Dsp Microcomputer
• Manufacturer: Analog Devices, Inc.

ADSP-2185
Parameter
IDMA Read, Long Read Cycle
Timing Requirements:
t
t
Switching Characteristics:
t
t
t
t
t
t
t
t
NOTES
1
2
3
4
Start of Read = IS Low and IRD Low.
End of Read = IS High or IRD High.
DM read or first half of PM read.
Second half of PM read.
IKR
IRP
IKHR
IKDS
IKDH
IKDD
IRDE
IRDV
IRDH1
IRDH2
IACK Low before Start of Read
Duration of Read
IACK High after Start of Read
IAD15–0 Data Setup before IACK Low
IAD15–0 Data Hold after End of Read
IAD15–0 Data Disabled after End of Read
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)
IAD15–0 Previous Data Hold after Start of Read (PM2)
IAD 15–0
IACK
1
IRD
IS
Figure 23. IDMA Read, Long Read Cycle
t
IRDE
1
t
IKR
1
t
IRDV
2
t
2
IKHR
PREVIOUS
t
IRDH
–26–
DATA
t
IRP
4
t
IKDS
3
READ
DATA
Min
0
15
0.5 t
0
0
2 t
t
t
CK
IKDD
CK
CK
– 5
– 5
t
IKDH
– 10
Max
15
10
15
REV. 0
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns