MCIMX251AVM4 Freescale Semiconductor, MCIMX251AVM4 Datasheet - Page 89
MCIMX251AVM4
Manufacturer Part Number
MCIMX251AVM4
Description
IC MPU I.MX25 AUTO 400MAPBGA
Manufacturer
Freescale Semiconductor
Series
i.MX25r
Datasheet
1.MCIMX255AJM4.pdf
(140 pages)
Specifications of MCIMX251AVM4
Core Processor
ARM9
Core Size
32-Bit
Speed
400MHz
Connectivity
1-Wire, CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
Peripherals
DMA, I²S, 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
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCIMX251AVM4
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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3.7.9.3
In RMII mode, FEC_TX_CLK is used as the REF_CLK, which is a 50 MHz ± 50 ppm continuous
reference clock. FEC_RX_DV is used as the CRS_DV in RMII. Other signals under RMII mode include
FEC_TX_EN, FEC_TXD[1:0], FEC_RXD[1:0] and FEC_RX_ER.
Figure 59
figure.
Freescale Semiconductor
M16
M17
M18
M19
M20
M21
ID
FEC_TXD[1:0] (output)
FEC_TX_EN
FEC_RXD[1:0]
FEC_RX_ER
REF_CLK(FEC_TX_CLK) pulse width high
REF_CLK(FEC_TX_CLK) pulse width low
REF_CLK to FEC_TXD[1:0], FEC_TX_EN invalid
REF_CLK to FEC_TXD[1:0], FEC_TX_EN valid
FEC_RXD[1:0], CRS_DV(FEC_RX_DV), FEC_RX_ER to REF_CLK setup
REF_CLK to FEC_RXD[1:0], FEC_RX_DV, FEC_RX_ER hold
REF_CLK (input)
shows RMII mode timings.
CRS_DV (input)
RMII Mode Timing
i.MX25 Applications Processor for Automotive Products, Rev. 8
Figure 59. RMII Mode Signal Timing Diagram
Characteristic
Table 66
Table 66. RMII Signal Timing
M20
M18
describes the timing parameters (M16–M21) shown in the
M21
M19
M16
M17
35%
35%
Min.
—
3
2
2
Max.
65%
65%
12
—
—
—
REF_CLK period
REF_CLK period
Unit
ns
ns
ns
ns
89
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