adsp-2188m Analog Devices, Inc., adsp-2188m Datasheet - Page 34

• Manufacturer Part Number: adsp-2188m
• Description: Dsp Microcomputer
• Manufacturer: Analog Devices, Inc.

ADSP-2188M
Parameter
IDMA Read, Short Read Cycle
Timing Requirements:
t
t
t
Switching Characteristics:
t
t
t
t
t
NOTES
1
2
3
4
5
6
Short Read Only must be disabled in the IDMA Overlay memory mapped register.
Consider using the Short Read Only mode, instead, because Short Read mode is not applicable at high clock frequencies.
Start of Read = IS Low and IRD Low.
DM Read or first half of PM Read.
Second half of PM Read.
End of Read = IS High or IRD High.
IKR
IRP1
IRP2
IKHR
IKDH
IKDD
IRDE
IRDV
IACK Low before Start of Read
Duration of Read (DM/PM1)
Duration of Read (PM2)
IACK High after Start of Read
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
1, 2
IAD15–0
IACK
5
IRD
IS
4
3
3
t
IKR
t
IRDE
6
6
t
IKHR
t
IRDV
t
IRP
PREVIOUS
DATA
t
IKDD
Min
0
10
10
0
0
t
IKDH
Max
2t
t
10
10
10
CK
CK
– 5
– 5
Unit
ns
ns
ns
ns
ns
ns
ns
ns