MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1628

• 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

MAC Transmit
26.3.7.9 Frame Padding Remove
When a frame is received with a Payload length field set to lower than 46 (42 for VLAN
tagged and 38 for frames with stacked VLANs) the '0' padding can be optionally removed
before the Frame is written into the data FIFO as configured by the configuration bit
PAD_EN.
26.3.8 MAC Transmit
26.3.8.1 Overview
Frame transmission starts when the Transmit FIFO holds enough data. Once a transfer has
started, the MAC transmit function performs the following tasks:
When the MAC is configured to operate in Half Duplex mode, the following additional
tasks are performed:
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• Generate Preamble and SFD field before Frame transmission.
• Generate XOFF pause frames if the Receive FIFO reports a congestion or if register
• Generate XON pause frames if the Receive FIFO congestion condition is cleared or if
• Suspend Ethernet Frame transfer (XOFF) if a non zero Pause Quanta is received from
• Add padding to the frame if required.
• Calculate and append CRC-32 to the transmitted frame.
• Send Frame with correct Inter Packet Gap (IPG) (Deferring).
• Collision detection
• Frame retransmit after back-off timer has expired
TFC_PAUSE signal is asserted with PAUSE_DUR set to a non zero value.
register TFC_PAUSE signal is asserted with PAUSE_DUR set to 0.
the MAC receive path.
If a frame is received with excess padding (that is, length field as
mentioned above, but frame has more than 64 octets) and padding
removal is enabled, the padding is removed as normal and no
error is caused if the frame is otherwise correct (for example, good
CRC and less maximum length and no other error).
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Note
Freescale Semiconductor, Inc.