參數(shù)資料
型號: MCIMX251AJM4A
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA400
封裝: 17 X 17 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-400
文件頁數(shù): 106/140頁
文件大小: 1416K
代理商: MCIMX251AJM4A
i.MX25 Applications Processor for Automotive Products, Rev. 8
68
Freescale Semiconductor
3.7.6.2
NAND Flash Controller (NFC) Timing
The i.MX25 NFC supports normal timing mode, using two Flash clock cycles for one access of RE and
WE. AC timings are provided as multiplications of the clock cycle and fixed delay. Figure 34 through
Figure 37 depicts the relative timing between NFC signals at the module level for different operations
under normal mode. Table 55 describes the timing parameters (NF1–NF17) that are shown in the figures.
Figure 34. Command Latch Cycle Timing Diagram
Figure 35. Address Latch Cycle Timing Diagram
2 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).
3 The value was calculated for an SDCLK frequency of 133 MHz, by the formula tQH = tHP – tQHS = min. (tCL,tCH) – tQHS =
0.45*tCK – tQHS = 0.45 * 7.5 – 0.45 = 2.925 ns
NFCLE
NFCE
NFWE
NFALE
NFIO[7:0]
Command
NF9
NF8
NF1
NF2
NF5
NF3
NF4
NF6
NF7
NFCLE
NFCE
NFWE
NFALE
NFIO[7:0]
Address
NF9
NF8
NF1
NF5
NF3
NF4
NF6
NF11
NF10
NF7
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