MCIMX255AJM4A Freescale, MCIMX255AJM4A Datasheet - Page 66
MCIMX255AJM4A
Manufacturer Part Number
MCIMX255AJM4A
Description
Manufacturer
Freescale
Datasheet
1.MCIMX255AJM4A.pdf
(132 pages)
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3.7.6.2
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 37
under normal mode.
66
2
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).
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
depicts the relative timing between NFC signals at the module level for different operations
NAND Flash Controller (NFC) Timing
NFCE
NFWE
NFIO[7:0]
NFCE
NFWE
NFCLE
NFALE
NFCLE
NFALE
NFIO[7:0]
Table 53
i.MX25 Applications Processor for Automotive Products, Rev. 4
Figure 34. Command Latch Cycle Timing Diagram
Figure 35. Address Latch Cycle Timing Diagram
describes the timing parameters (NF1–NF17) that are shown in the figures.
NF6
NF6
NF3
NF3
NF1
NF1
Command
NF8
Address
NF5
NF8
NF5
NF10
NF4
NF9
NF7
NF9
NF7
NF11
NF2
NF4
Figure 34
Freescale Semiconductor
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