參數(shù)資料
型號(hào): ADSP2185
廠商: Analog Devices, Inc.
元件分類: 數(shù)字信號(hào)處理
英文描述: DSP Microcomputer
中文描述: DSP微機(jī)
文件頁(yè)數(shù): 26/32頁(yè)
文件大小: 289K
代理商: ADSP2185
ADSP-2185
REV. 0
–26–
Parameter
Min
Max
Unit
IDMA Read, Long Read Cycle
Timing Requirements
:
t
IK R
t
IRP
IACK
Low before Start of Read
1
Duration of Read
1
0
15
ns
ns
Switching Characteristics
:
t
IK HR
t
IK DS
t
IK DH
t
IK DD
t
IRDE
t
IRDV
t
IRDH1
t
IRDH2
IACK
High after Start of Read
1
IAD15–0 Data Setup before
IACK
Low
IAD15–0 Data Hold after End of Read
2
IAD15–0 Data Disabled after End of Read
2
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)
3
IAD15–0 Previous Data Hold after Start of Read (PM2)
4
15
ns
ns
ns
ns
ns
ns
ns
ns
0.5 t
CK
– 10
0
10
0
15
2 t
CK
– 5
t
CK
– 5
NOT ES
1
Start of Read =
IS
Low and
IRD
Low.
2
End of Read =
IS
High or
IRD
High.
3
DM read or first half of PM read.
4
Second half of PM read.
t
IRP
t
IKR
PREVIOUS
DATA
READ
DATA
t
IKHR
t
IKDS
t
IRDV
t
IRDH
t
IKDD
t
IRDE
t
IKDH
IAD 15–0
IACK
IS
IRD
Figure 23. IDMA Read, Long Read Cycle
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