參數(shù)資料
型號: ADSP-21261SKSTZ150
廠商: Analog Devices Inc
文件頁數(shù): 20/44頁
文件大小: 0K
描述: IC DSP 32BIT 150MHZ 144LQFP
產(chǎn)品培訓模塊: SHARC Processor Overview
標準包裝: 60
系列: SHARC®
類型: 浮點
接口: DAI,SPI
時鐘速率: 150MHz
非易失內(nèi)存: ROM(384 kB)
芯片上RAM: 128kB
電壓 - 輸入/輸出: 3.30V
電壓 - 核心: 1.20V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 144-LQFP
供應(yīng)商設(shè)備封裝: 144-LQFP(20x20)
包裝: 托盤
ADSP-21261
Rev. 0
|
Page 27 of 44
|
March 2006
Memory Write—Parallel Port
Use the specifications in Table 21, Table 22, Figure 19, and
Figure 20 for asynchronous interfacing to memories (and
memory-mapped peripherals) when the ADSP-21261 is access-
ing external memory space.
Table 21. 8-Bit Memory Write Cycle
Parameter
Min
Max
Unit
Switching Characteristics
tALEW
ALE Pulse Width
2 × tCCLK – 2
ns
tALERW
1 × tCCLK – 0.5
ns
tADAS
Address/Data15–0 Setup Before ALE Deasserted1
2.5 × tCCLK – 2.0
ns
tADAH
Address/Data15–0 Hold After ALE Deasserted1
0.5 × tCCLK – 0.8
ns
tWW
WR Pulse Width
D – 2
ns
tADWL
Address/Data15–8 to WR Low
0.5 × tCCLK – 1.5
ns
tADWH
Address/Data15–8 Hold After WR High
0.5 × tCCLK – 1 + H
ns
tALEHZ
ALE Deasserted
1 to Address/Data15–0 in High Z
0.5 × tCCLK – 0.8
0.5tCCLK + 2.0
ns
tDWS
Address/Data7–0 Setup Before WR High
D
ns
tDWH
Address/Data7–0 Hold After WR High
0.5 × tCCLK – 1.5 + H
ns
tDAWH
Address/Data to WR High
D
ns
D = (data cycle duration) × t
CCLK
H = t
CCLK (if a hold cycle is specified, else H = 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
t
ADAS
AD7–0
t
ALEW
ALE
RD
tWW
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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