MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1821

• 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

The record's bit 49 decides which type of record is found in the table:
The 48-bit MAC address is stored with the first octet in bits 7:0 and the sixth octet in 47:40
of the record.
29.4.9.1 MAC Address Lookup
The 48-Bit destination MAC address of each frame received by the Switch, on any of its
interfaces, is extracted by the Hardware and provided to the look-up engine together with
the physical interface number. If the frame carries a VLAN tag, the tag information is also
extracted and provided to the look-up engine.
If the received frame is a Unicast or Multicast frame, a Two-Stage lookup process is
implemented. The look-up engine first calculates the hash value from the MAC address.
The hash code is used as an entry to the Switch address table. The look-up function can
provide three results with tree different associated actions performed by the switch hardware:
Freescale Semiconductor, Inc.
1. The address is in the table and associated with a correct port number:
2. The address is in the table but is associated with the port on which it was received:
3. The address is not found in the table:
• If 0, a dynamic entry is available and the 10-bit timestamp and 4-bit port number are
• If 1, a static entry is available with a 3-bit priority field followed by a port bit mask of
given in the upper bits of the record.
3 bits. The record bit 53 represents Port 0, bit 54 Port 1 and bit 55 port 2. The frame
will be forwarded to all ports that have a 1 in the port bitmask. The source port will be
removed dynamically from the bitmask during forwarding (a frame is never forwarded
to the port where it came from).
• The switch forwards the frame only to the looked up port.
• The switch discards the frame and does not forward it to any port.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Figure 29-9. Address Memory Record Types
63
Port#
4 bit
n-bit Port Mask
60
Port Bitmask
10 bit Timestamp
59
...
53 52..50
50
Chapter 29 Programmable 3-Port Ethernet Switch with QOS (SWITCH)
0
1
3-bit priority
47
48: Record Valid
49: Record Type
MAC Address (48 Bits)
0
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