參數(shù)資料
型號: ADSP-21266
廠商: Analog Devices, Inc.
英文描述: SHARC Embedded Processor
中文描述: SHARC處理器嵌入式處理器
文件頁數(shù): 26/44頁
文件大?。?/td> 426K
代理商: ADSP-21266
Rev. B
|
Page 26 of 44
|
May 2005
ADSP-21266
Table 21. 16-Bit Memory Read Cycle
Parameter
Timing Requirements
t
DRS
t
DRH
Min
Max
Unit
Address/Data 15–0 Setup Before RD high
Address/Data 15–0 Hold After RD high
3.3
0
ns
ns
Switching Characteristics
t
ALEW
t
ALERW
t
ADAS
t
ADAH
t
ALEHZ
t
RW
D = (data cycle duration) × t
CCLK
H = t
CCLK
(if a hold cycle is specified, else H = 0)
ns
ns
ns
ns
ns
ns
ns
ALE Pulse Width
ALE Deasserted to Read/Write Asserted
Address/Data 15–0 Setup Before ALE Deasserted
1
Address/Data 15–0 Hold After ALE Deaserted
1
ALE Deasserted
1
to Address/Data 15–0 In High Z
RD Pulse Width
2 × t
CCLK
– 2
1 × t
CCLK
– 0.5
2.5 × t
CCLK
– 2.0
0.5 × t
CCLK
– 0.8
0.5 × t
CCLK
– 0.8
D – 2
0.5t
CCLK
+ 2.0
1
On reset, ALE is an active high cycle. However, it can be reconfigured by software to be active low.
Figure 18. 16-Bit Memory Read Cycle
VALID ADDRESS
VALID DATA
t
ADAS
t
ADAH
AD15-0
t
ALEHZ
t
DRS
t
DRH
t
ALEW
ALE
RD
t
RW
WR
t
ALERW
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