adsp-2186n Analog Devices, Inc., adsp-2186n Datasheet - Page 37

• Manufacturer Part Number: adsp-2186n
• Description: Dsp Microcomputer
• Manufacturer: Analog Devices, Inc.

IDMA Read, Long Read Cycle
Table 24. IDMA Read, Long Read Cycle
1
2
3
4
Parameter
Timing Requirements:
t
t
Switching Characteristics:
t
t
t
t
t
t
t
t
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
2
1
t
1
IRDE
t
IKR
Figure 35. IDMA Read, Long Read Cycle
Rev. A | Page 37 of 48 | August 2006
2
t
IRDV
t
2
IRDH1 OR
t
IKHR
PREVIOUS
DATA
t
IRDH2
4
3
t
IKDS
READ
DATA
t
IRK
Min
0
2
0.5t
0
0
2t
t
CK
CK
t
– 5
IKDD
CK
– 5
– 3
t
IKDH
Max
10
10
11
ADSP-218xN
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns