參數(shù)資料
型號(hào): ADSP-21469KBCZ-4
廠商: Analog Devices Inc
文件頁數(shù): 29/72頁
文件大小: 0K
描述: IC DSP 32/40BIT 450MHZ 324BGA
產(chǎn)品變化通告: Pin Function Change 08/Mar/2012
標(biāo)準(zhǔn)包裝: 1
系列: SHARC®
類型: 浮點(diǎn)
接口: DAI,DPI,EBI/EMI,I²C,SCI,SPI,SSP,UART/USART
時(shí)鐘速率: 450MHz
非易失內(nèi)存: 外部
芯片上RAM: 5Mb
電壓 - 輸入/輸出: 3.30V
電壓 - 核心: 1.10V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 324-BGA,CSPBGA
供應(yīng)商設(shè)備封裝: 324-CSPBGA
包裝: 托盤
ADSP-21469
Rev. 0
|
Page 35 of 72
|
June 2010
AMI Write
Use these specifications for asynchronous interfacing to memo-
ries. Note that timing for AMI_ACK, AMI_DATA, AMI_RD,
AMI_WR, and strobe timing parameters only apply to asyn-
chronous access mode.
Table 31. Memory Write
Parameter
Min
Max
Unit
Timing Requirements
tDAAK
AMI_ACK Delay from Address, Selects1, 2
tDDR2_CLK – 9.7 + W
ns
tDSAK
AMI_ACK Delay from AMI_WR Low 1, 3
W – 6
ns
Switching Characteristics
tDAWH
Address, Selects to AMI_WR Deasserted2
tDDR2_CLK –3.1+ W
ns
tDAWL
Address, Selects to AMI_WR Low2
tDDR2_CLK –3
ns
tWW
AMI_WR Pulse Width
W – 1.3
ns
tDDWH
Data Setup Before AMI_WR High
tDDR2_CLK –3.0+ W
ns
tDWHA
Address Hold After AMI_WR Deasserted
H + 0.15
ns
tDWHD
Data Hold After AMI_WR Deasserted
H
ns
tDATRWH
Data Disable After AMI_WR Deasserted4
tDDR2_CLK – 1.37 + H
tDDR2_CLK + 4.9 + H
ns
tWWR
AMI_WR High to AMI_WR Low5
tDDR2_CLK –1.5+ H
ns
tDDWR
Data Disable Before AMI_RD Low
2tDDR2_CLK – 6
ns
tWDE
AMI_WR Low to Data Enabled
tDDR2_CLK – 3.5
ns
W = (number of wait states specified in AMICTLx register) × tSDDR2_CLK H = (number of hold cycles specified in AMICTLx register) × tDDR2_CLK
1 AMI_ACK delay/setup: System must meet tDAAK, or tDSAK, for deassertion of AMI_ACK (low).
2 The falling edge of AMI_MSx is referenced.
3 Note that timing for AMI_ACK, AMI_DATA, AMI_RD, AMI_WR, and strobe timing parameters only applies to asynchronous access mode.
4 See Test Conditions on Page 58 for calculation of hold times given capacitive and dc loads.
5 For Write to Write: tDDR2_CLK + H, for both same bank and different bank. For Write to Read: (3 × tDDR2_CLK) + H, for the same bank and different banks.
Figure 21. AMI Write
AMI_ACK
AMI_DATA
tDAWH
tDWHA
tWWR
tDATRWH
tDWHD
tWW
tDDWR
tDDWH
tDAWL
tWDE
tDSAK
tDAAK
AMI_RD
AMI_WR
AMI_ADDR
AMI_MSx
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