MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 1824

• Manufacturer Part Number: MCIMX281AVM4B
• Description: IC MPU I.MX28 1.2 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX281AVM4B

• 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: Supplier Unconfirmed

Ipv4 and Ipv6 Priority Look Up
29.4.9.4 Migration
If the Firmware received a MAC address, which is already in the Switch table but is
associated to a different physical port number, the current entry is overwritten with the new
information and the timestamp is set to the current time.
29.4.9.5 Aging
Aging refers to deleting old entries within the table. It proceeds as follows:
This process runs continuously in the background of the firmware. The aging period is
software controlled and programmable, defaulting to 4 seconds per step giving a range of
4 seconds to 68 minutes.
29.4.10.1 Overview
When an input port has been selected the frame is forwarded to its corresponding output
port. Output port resolution and switching is based on the information from the two-stage
MAC Address look-up (see 5.9 page 37) followed by additional resolution functions to
allow frame duplication and flooding control, which are described in the following sections.
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2. If there is no more space in the MAC address table, a new entry replaces the oldest
1. The time stamp is stored with all the entries and is updated each time the source address
2. If a record is not updated for a longer period of time, it is removed from the table if it
3. Static entries are not affected by the aging process and kept always.
entry with an identical matching hash value.
appears again. The time stamp is a 10-bit value.
is a dynamic entry.
• Time stamp: a 10-bit value, used to determine the age of an entry.
• Port number: a 4-bit value, which indicates the port through which the frame was
received.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Freescale Semiconductor, Inc.