參數(shù)資料
型號: MCIMX258CJM4
廠商: Freescale Semiconductor
文件頁數(shù): 116/153頁
文件大小: 0K
描述: MPU IMX25 IND 400-MAPBGA
特色產(chǎn)品: MCIMX25 Applications Processors
標準包裝: 90
系列: i.MX25
核心處理器: ARM9
芯體尺寸: 32-位
速度: 400MHz
連通性: 1 線,CAN,EBI/EMI,以太網(wǎng),I²C,MMC,智能卡,SPI,SSI,UART/USART,USB OTG
外圍設備: DMA,I²S,LCD,POR,PWM,WDT
輸入/輸出數(shù): 128
程序存儲器類型: 外部程序存儲器
RAM 容量: 144K x 8
電壓 - 電源 (Vcc/Vdd): 1.15 V ~ 1.52 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 3x12b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 400-LFBGA
包裝: 托盤
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 10
Freescale Semiconductor
65
Figure 33. DDR2 SDRAM DQ vs. DQS and SDCLK READ Cycle Timing Diagram
DQ Slew Rate
V/ns
2.0 188
188
167
146
125
63
————
————————
1.5 146
167
125
83
42
81
43
————————
1.0 63
125
42
83
0
–2
1
–7
–13
————————
0.9
31
69
–11
–14
–13
–18
–27
–29
–45
——————
0.8
————
–25
–31
–27
–30
–32
–44
–43
–62
–60
–86
————
0.7
—————
–45
–53
–50
–67
–61
–85
–78 –109 –108 –152
0.6
—————
———
–74
–96
–85 –114 –102 –138 –132 –181 –183 –246
0.5
—————
–128 –156 –145 –180 –175 –223 –226 –288
0.4
—————
–210 –243 –240 –286 –291 –351
1 All units in ‘ps’.
2 Test conditions are at capacitance=15pF for DDR PADS. Recommended drive strengths are medium for SDCLK and high for
address and controls.
3 SDRAM CLK and DQS related parameters are measured from the 50% point. That is, high is defined as 50% of the signal
value, and low is defined as 50% of the signal value. DDR SDRAM CLK parameters are measured at the crossing point of
SDCLK and SDCLK (inverted clock).
Table 54. DDR2 SDRAM Read Cycle Parameter Table1,2
1 Test conditions are at capacitance=15 pF for DDR PADS. Recommended drive strengths are medium for SDCLK and high for
address and controls.
ID
Parameter
Symbol
DDR2-400
Unit
Min.
Max.
DDR24 DQS - DQ Skew (defines the Data valid window in read cycles related to DQS)
tDQSQ
—0.6
ns
DDR25 DQS DQ in HOLD time from DQS3
tQH
2.5
ns
DDR26 DQS output access time from SDCLK posedge
tDQSCK
–0.5
0.5
ns
Table 53.
ΔtDS1, ΔtDH1 Derating Values for DDR2-400, DDR2-5331,2,3 (continued)
DQS Single-Ended Slew Rate
SDCLK
SDCLK_B
DQS (input)
DQ (input)
DATA
DDR26
DDR24
DDR25
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