MCIMX255AJM4AR2 Freescale Semiconductor, MCIMX255AJM4AR2 Datasheet - Page 45

• Manufacturer Part Number: MCIMX255AJM4AR2
• Description: Processors - Application Specialized IMX25 1.2 AUTO
• Manufacturer: Freescale Semiconductor

Specifications of MCIMX255AJM4AR2

• Core: ARM926EJ-S
• Processor Series: MCIMX25
• Maximum Clock Frequency: 400 MHz
• Instruction / Data Cache Memory: 16 KB
• Data Ram Size: 128 KB
• Operating Supply Voltage: 1.15 V to 1.52 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: MAPBGA-400
• Interface Type: USB
• Memory Type: DDR2
• Minimum Operating Temperature: - 40 C

Figure 12
To meet PIO write mode timing requirements, a number of timing parameters must be controlled.
shows timing parameters and their determining relations, and indicates parameters that can be adjusted to
meet required conditions.
1
Freescale Semiconductor
Parameter
See
ATA
tA
—
—
t1
t2
t9
t3
t4
t0
Figure
gives timing waveforms for PIO write mode.
Mode Timing
12.
Parameter
PIO Write
t2w
—
tA
—
—
—
t1
t9
t4
Write Data(15:0)
1
ADDR
(See note 1)
buffer_en
i.MX25 Applications Processor for Automotive Products, Rev. 9
t1(min.) = time_1
t2(min.) = time_2w
t9(min.) = time_9
t3(min.) = (time_2w – time_on)
t4(min.) = time_4
tA = (1.5 + time_ax) T – (tco + tsui + tcable2 + tcable2 + 2
t0(min.) = (time_1 + time_2 + time_9)
Avoid bus contention when switching buffer on by making ton long
enough
Avoid bus contention when switching buffer off by making toff long
enough
DIOR
DIOW
IORDY
IORDY
Table 37. Timing Parameters for PIO Write Mode
Figure 12. PIO Write Mode Timing
T – (tskew1 + tskew2 + tskew5)
T – (tskew1 + tskew2 + tskew6)
T – tskew1
T – (tskew1 + tskew2 + tskew5)
t1
Relation
ton
tA
T – (tskew1 + tskew2 +tskew5)
T
t2w
tB
t4 toff
t9
tbuf)
t1
if not met, increase time_2w
Adjustable Parameter(s)
time_1, time_2r, time_9
time_2w
time_ax
time_9
time_4
time_1
—
—
Table 37
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