MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1612

• 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

Ethernet MAC Frame Formats
Optionally MAC frames can be VLAN-tagged with an additional 4-byte field (VLAN Tag
and VLAN Info) inserted between the MAC source address and the Type/Length Field.
VLAN tagging is defined by the IEEE P802.1q specification. VLAN tagged frames have
a maximum length of 1522 bytes, excluding the preamble and the SFD bytes.
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Destination and Source
Payload Length
Frame length
Address
Term
Although the IEEE specification defines a maximum frame length,
the MAC core provides the flexibility to program any value for
the frame maximum length.
Figure 26-6. VLAN Tagged MAC Frame Format Overview
The length, in octets, defines the length of the complete Frame without preamble and SFD. A frame
has a valid length if it contains at least 64 octets and does not exceed the programmed maximum
length (typical 1518).
The length / type field indicates the length of the frame's payload section. The most significant byte
is sent/received first.
If the Length/type field is set to a value lower than 46, the payload is padded so that the minimum
frame length requirement (64 Bytes) is met. For VLAN tagged frames, a value less than 42 indicates
a padded frame.
If the Length/type field is set to a value larger than the programmed frame maximum length (e.g. 1518)
it is interpreted as a type field.
48-bit MAC addresses. The least significant byte is sent/received first and the two first bits (two least
significant bits) of the MAC address are used to distinguish MAC frames.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Description
Frame length
Frame length
Figure 26-5. MAC Frame Format Overview
Table 26-5. MAC Frame Definition
0..1500/9000 octets
7 octets
1 octet
6 octets
6 octets
2 octets
0..46 octets
4 octets
0..1500/9000 octets
7 octets
1 octet
6 octets
6 octets
2 octets
2 octets
2 octets
0..42 octets
4 octets
FRAME CHECK SEQUENCE
Note
FRAME CHECK SEQUENCE
EXTENSION (half dup only)
EXTENSION (half dup only)
DESTINATION ADDRESS
DESTINATION ADDRESS
SOURCE ADDRESS
SOURCE ADDRESS
VLAN Tag (0x8100)
PAYLOAD DATA
PAYLOAD DATA
LENGTH/TYPE
LENGTH/TYPE
PREAMBLE
PREAMBLE
VLAN info
PAD
PAD
SFD
SFD
lengthtype field
Payload length
Payload length
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