MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1649

• 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

26.3.16 FIFO Protection
26.3.16.1 Transmit FIFO Underflow
When the Transmit FIFO, during a frame transfer, reaches the almost empty threshold with
no End of Frame indication stored in the FIFO, the MAC logic stops reading data from the
FIFO, sets the MII error signal (mii_tx_err) to '1' to indicate that the fragment already
transferred is not valid and deasserts the MII transmit enable signal (mii_tx_en) to terminate
the frame transfer .
When after an underflow, the application completes the frame transfer , the MAC transmit
logic discards any new data available in the FIFO until the end of packet is reached and sets
bit UE of
The MAC starts to transfer data on the MII interface when the application sends a new
frame with a start of frame indication .
26.3.16.2 Transmit FIFO Overflow
On the transmit path, when the FIFO reaches the programmable almost full threshold, if
the application keeps sending new data, the transmit FIFO will overflow, corrupting
previously stored contents. ENET-MAC will set bit OE of
Descriptor
Freescale Semiconductor, Inc.
Enhanced uDMA Transmit Buffer
for the next frame transmitted to indicate this overflow occurrence.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Figure 26-23. Loopback Options
RMII_ECHO
RMII_ECHO
RMII_LOOP
LOOP
LOOP
Descriptor.
ena_loop
ena_rmii_loop
ena_rmii_echo
Enhanced uDMA Transmit Buffer
Chapter 26 Ethernet Controller (ENET)
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