ADSP-2187L Analog Devices, ADSP-2187L Datasheet - Page 28

• Manufacturer Part Number: ADSP-2187L
• Description: DSP Microcomputer
• Manufacturer: Analog Devices

ADSP-2187L
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
IRK
IKHR
IKDS
IKDH
IKDD
IRDE
IRDV
IRDH1
IRDH2
IACK Low before Start of Read
End of Read after IACK Low
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)
IAD15–0
IACK
IRD
IS
Figure 29. IDMA Read, Long Read Cycle
t
IRDE
2
1
t
IKR
1
t
IRDV
2
t
2
IKHR
PREVIOUS
t
IRDH
DATA
–28–
4
t
IKDS
3
READ
DATA
t
IRK
Min
0
2
4
0.5t
0
0
2t
t
CK
CK
t
IKDD
– 5
CK
– 5
– 7
t
IKDH
Max
15
10
10
REV. 0
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns