參數(shù)資料
型號(hào): ADSP-2187N
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)
文件頁數(shù): 36/48頁
文件大?。?/td> 1571K
代理商: ADSP-2187N
ADSP-218xN Series
–36–
REV. 0
IDMA Read, Long Read Cycle
Table 24. IDMA Read, Long Read Cycle
Parameter
Timing Requirements:
t
IKR
t
IRK
Switching Characteristics:
t
IKHR
t
IKDS
t
IKDH
t
IKDD
t
IRDE
t
IRDV
t
IRDH1
t
IRDH2
Min
Max
Unit
IACK Low before Start of Read
1
End of read after IACK Low
2
0
2
ns
ns
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
10
ns
ns
ns
ns
ns
ns
ns
ns
0.5t
CK
– 3
0
10
0
11
2t
CK
– 5
t
CK
– 5
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.
Figure 33. IDMA Read, Long Read Cycle
t
IRK
t
IKR
PREVIOUS
DATA
READ
DATA
t
iKHR
t
IKDS
t
IRDV
t
iKDD
t
IRDE
t
IKDH
IAD15–0
IACK
IS
IRD
t
IRDH1 OR
t
IRDH2
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