參數(shù)資料
型號(hào)： ADSP-21267
廠商： Analog Devices, Inc.
英文描述： Preliminary Technical Data
中文描述： 初步技術(shù)數(shù)據(jù)
文件頁數(shù)： 26/44頁
文件大小： 454K
代理商： ADSP-21267
Rev. PrA
|
Page 26 of 44
|
January 2004
ADSP-21267
PRELIMINARY TECHNICAL DATA
Memory Write—Parallel Port
Use these specifications for asynchronous interfacing to memo-
ries (and memory-mapped peripherals) when the
ADSP-21267 is accessing external memory space.
Table 20. 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) x 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 x t
CCLK
– 2
1 x t
CCLK
– 1
2.5 x t
CCLK
– 2.0
0.5 x t
CCLK
– 0.8
D - 2
0.5 x t
CCLK
– 1.5
0.5 x t
CCLK
– 1 + H
0.5 x t
CCLK
– 0.8
D
0.5 x t
CCLK
– 1.5 + H
D
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
0.5t
CCLK
+ 3.0
1
On reset, ALE is an active high cycle. However, it can be reconfigured by software to be active low.
Figure 19. Write Cycle For 8-bit Memory Timing
AD[15:8
]
VALID ADDRESS
VALID ADDRESS
t
ADAS
AD[7:0]
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
相關(guān)PDF資料
PDF描述
ADSP-21267SKBCZ-X Preliminary Technical Data
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADSP-21267SKBCZ-X 制造商:AD 制造商全稱:Analog Devices 功能描述:Preliminary Technical Data
ADSP-21267SKSTZ-X 制造商:AD 制造商全稱:Analog Devices 功能描述:Preliminary Technical Data
ADSP-21362 制造商:AD 制造商全稱:Analog Devices 功能描述:SHARC Processor
adsp-21362bbc-1aa 制造商:Analog Devices 功能描述:
ADSP-21362BBCZ-1AA 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC 333 MHz Processor includes DTCP/SPDIF RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
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