adsp-21mod870-100 Analog Devices, Inc., adsp-21mod870-100 Datasheet - Page 29

• Manufacturer Part Number: adsp-21mod870-100
• Description: Internet Gateway Processor
• Manufacturer: Analog Devices, Inc.

TIMING PARAMETERS
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
REV. 0
IKR
IRK
IKHR
IKDS
IKDH
IKDD
IRDE
IRDV
IRDH1
IRDH2
Start of Read = IS Low and IRD Low.
DM read or first half of PM read.
End of Read = IS High or IRD High.
Second half of PM read.
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 31. IDMA Read, Long Read Cycle
t
IRDE
2
t
1
IKR
1
t
IRDV
3
t
3
IKHR
PREVIOUS
t
IRDH
–29–
DATA
4
t
IKDS
2
READ
DATA
t
IRK
Min
0
2
4
0.5 t
0
0
2 t
t
CK
t
IKDD
CK
– 5
CK
– 5
t
IKDH
– 7
ADSP-21mod870
Max
15
10
10
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns