MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1595

• 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

26.2.1.1 Overview
The Unified DMA (uDMA) block is connected with the ENET-MAC and through the
3PSWITCH. This is NOT a general purpose DMA but is highly specific to support Ethernet
traffic.
Fundamentally, there are two basic modes of operation. The uDMA supports a legacy mode
which enables data to be transferred in a format significantly consistent with the legacy
FEC device that exists on several parts through the Legacy Buffer Descriptor (LBD).
Additionally the uDMA supports an Enhanced Buffer Descriptor (EBD) which in turn
provides the ability to make use of several new features including (but not limited to)
IEEE-1588 support, Gigabit Ethernet, transmit error checking and various off loading
features.
The uDMA blocks are highlighted in
In reference to the figure:
1 - The interface between the MAC-NET and the SoC Pad Logic. All pin multiplexing takes
place outside the ENET-MAC, including RMII and MII.
2 - The ENET-MAC communicates with the Unified DMA through two FIFO interfaces.
One of the FIFO interfaces is for RX the other is for TX. These interfaces also contain a
set of sideband signals.
3 - The Unified DMA communicates with the SoC Platform through this interface.
26.2.1.2 Features
The primary features of the uDMA are listed below:
Freescale Semiconductor, Inc.
• Only Surport big-endian.
• Separate TX and RX interfaces to allow for minimum space or maximum data
throughput.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
APB
Bus
Figure 26-2. Typical uDMA SoC Connection
SOC Pad
SOC Pad
MAC0
MAC1
Figure
1
1
26-2.
Switch
2
2
uDMA0
uDMA1
Chapter 26 Ethernet Controller (ENET)
3
3
AHB
Bus
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