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參數(shù)資料
| 型號(hào)： | 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)： | 27/44頁 |
| 文件大?。?/td> | 426K |
| 代理商： | ADSP-21266 |
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ADSP-21266
Rev. B
|
Page 27 of 44
|
May 2005
Memory Write—Parallel Port
Use the specifications in
Table 22
,
Table 23
,
Figure 19
, and
Figure 20
for asynchronous interfacing to memories (and
memory-mapped peripherals) when the ADSP-21266 is access-
ing external memory space.
Table 22. 8-Bit Memory Write Cycle
Parameter
Switching Characteristics
t
ALEW
t
ALERW
t
ADAS
t
ADAH
t
WW
t
ADWL
t
ADWH
t
ALEHZ
t
DWS
t
DWH
t
DAWH
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
Address/Data 15–8 to WR Low
Address/Data 15–8] Hold After WR High
ALE Deasserted
1
to Address/Data 15–0 In High Z
Address/Data 7–0 Setup Before WR High
Address/Data 7–0 Hold After WR High
Address/Data to 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
– 1.5
0.5 × t
CCLK
– 1 + H
0.5 × t
CCLK
– 0.8
D
0.5 × t
CCLK
– 1.5 + H
D
ns
ns
ns
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 19. 8-Bit Memory Write Cycle
AD15-8
VALID ADDRESS
VALID ADDRESS
t
ADAS
AD7-0
t
ALEW
ALE
RD
t
WW
WR
t
ADAH
t
ADWH
t
ADWL
t
ALEHZ
VALID DATA
t
DWS
t
DWH
VALID ADDRESS
t
DAWH
t
ALERW
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| ADSP-21266SKBC-2B | SHARC Embedded Processor |
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| ADSP-21266SKBCZ-2C | SHARC Embedded Processor |
| ADSP-21266SKBCZ-2D | SHARC Embedded Processor |
| ADSP-21266SKSTZ-1B | SHARC Embedded Processor |
相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ADSP-21266_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Embedded Processor |
| ADSP-21266KSTZ-1C | 制造商:Analog Devices 功能描述:- Trays |
| ADSP-21266KSTZ-2C | 制造商:Analog Devices 功能描述:- Trays |
| ADSP-21266SKBC-2B | 制造商:Analog Devices 功能描述:DSP FLOATING PT 32BIT 200MHZ 200MIPS 136CSPBGA - Trays |
| ADSP-21266SKBCZ-2B | 制造商:Analog Devices 功能描述: |
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