MCIMX253CVM4 Freescale Semiconductor, MCIMX253CVM4 Datasheet - Page 46

• Manufacturer Part Number: MCIMX253CVM4
• Description: IC MPU I.MX25 IND 400MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX25r

Specifications of MCIMX253CVM4

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 400MHz
• Connectivity: 1-Wire, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Number Of I /o: 128
• Program Memory Type: External Program Memory
• Ram Size: 144K x 8
• Voltage - Supply (vcc/vdd): 1.15 V ~ 1.52 V
• Data Converters: A/D 3x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 400-LFBGA
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Compliant

To meet PIO read 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
Figure 12
46
Parameter
See
ATA
trd
tA
t1
t2
t9
t5
t6
t0
Figure
gives timing waveforms for PIO write mode.
Mode Timing
11.
Parameter
PIO Read
trd1
t2r
tA
—
t1
t9
t5
t6
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 8
1
t1(min.) = time_1 × T – (tskew1 + tskew2 + tskew5)
t2(min.) = time_2r × T – (tskew1 + tskew2 + tskew5)
t9(min.) = time_9 × T – (tskew1 + tskew2 + tskew6)
t5(min.) = tco + tsu + tbuf + tbuf + tcable1 + tcable2
0
tA(min.) = (1.5 + time_ax) × T – (tco + tsui + tcable2 + tcable2 + 2 × tbuf)
trd1(max.) = (–trd) + (tskew3 + tskew4)
trd1(min.) = (time_pio_rdx – 0.5) × T – (tsu + thi)
(time_pio_rdx – 0.5) × T > tsu + thi + tskew3 + tskew4
t0(min.) = (time_1 + time_2 + time_9) × T
Write Data(15:0)
ADDR
(See note 1)
buffer_en
Table 36. Timing Parameters for PIO Read Mode
DIOR
DIOW
IORDY
IORDY
Figure 12. PIO Write Mode Timing
t1
Relation
ton
tA
t2w
tB
t4 toff
t9
t1
If not met, increase time_2
time_1, time_2r, time_9
Freescale Semiconductor
Adjustable Parameter
time_pio_rdx
time_ax
time_2r
time_9
time_1
—
Table 36