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參數資料
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: 28/44頁
文件大小: 426K
代理商: ADSP-21266
Rev. B
|
Page 28 of 44
|
May 2005
ADSP-21266
Table 23. 16-Bit Memory Write Cycle
Parameter
Switching Characteristics
t
ALEW
t
ALERW
t
ADAS
t
ADAH
t
WW
t
ALEHZ
t
DWS
t
DWH
D = (data cycle duration) × t
CCLK
H = t
CCLK
(if a hold cycle is specified, else H = 0)
Min
Max
Unit
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 Deasserted
1
WR Pulse Width
ALE Deasserted
1
to Address/Data 15–0 In High Z
Address/Data 15–0 Setup Before WR High
Address/Data 15–0 Hold After WR High
2 × t
CCLK
– 2
1 × t
CCLK
– 0.5
2.5 × t
CCLK
– 2.0
0.5 × t
CCLK
– 0.8
D – 2
0.5 × t
CCLK
– 0.8
D
0.5 × t
CCLK
– 1.5 + H
ns
ns
ns
ns
ns
ns
ns
ns
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 20. 16-Bit Memory Write Cycle
VALID ADDRESS
VALID DATA
t
ADAS
AD15-0
t
ALEW
ALE
WR
t
WW
RD
t
ADAH
t
DWH
t
DWS
t
ALERW
t
ALEH
相關PDF資料
PDF描述
ADSP-21266SKBC-2B SHARC Embedded Processor
ADSP-21266SKBCZ-2B SHARC Embedded Processor
ADSP-21266SKBCZ-2C SHARC Embedded Processor
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ADSP-21266_07 制造商:AD 制造商全稱:Analog Devices 功能描述:Embedded Processor
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