MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 962

• Manufacturer Part Number: MCIMX286CVM4B
• Description: IC MPU I.MX286 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX286CVM4B

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 454MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Program Memory Size: 128KB (32K x 32)
• Program Memory Type: Mask ROM
• Ram Size: 32K x 32
• Voltage - Supply (vcc/vdd): 1.25 V ~ 5.25 V
• Data Converters: A/D 17x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 289-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

Program Image
12.6.2 Device Configuration Data (DCD)
Upon reset the i.MX28 uses the default register values for all peripherals in the system. The
i.MX50 ROM changes some of these defaults such as clock frequencies for boot purposes.
However, these settings typically are not ideal for achieving optimal system performance
and there are even some peripherals that must configured before they can be used. The DCD
is configuration information contained in a Program Image, external to the ROM, that the
ROM interprets to configure various peripherals on i.MX28. Some components such as
SDRAM require some sequence of register programming as part of configuration before it
is ready to be used. The DCD feature can be used to program the EIM registers and
DATABAHN SDRAM control registers to the optimal settings.
The DCD table shown in below is a big endian byte array of the allowable DCD commands.
The maximum size of the DCD limited by the ROM to 1768 bytes.
The DCD header is 4 bytes with the following format:
where:
Below is an example DCD for i.MX28. Note that this example is not a complete DCD and
is shown here to illustrate how a DCD is structured.
962
Header
Tag
[CMD]
[CMD]
• Tag: A single byte field set to 0xD2
• Length: a two byte field in big endian format containing the overall length of the DCD,
• Version: A single byte field set to 0x40
...
in bytes, including the header.
Length
Version
The i.MX28 ROM does not use the
locate the DCD. Instead, the i.MX28 ROM uses the Load DCD
command. See
ROM command.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
ROM Commands
Table 12-13. DCD Data Format
Table 12-14. DCD Header
NOTE
for details on the Load DCD
Image Vector Table (IVT)
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