MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 1820

• 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
29.4.8.2 Hash Code
For a MAC address table up to 2048 entries, an 8-bit hash value is calculated from the
48-bits of the destination MAC address. The hash code is using a CRC-8:
29.4.8.3 Address Memory
The address memory is divided into blocks. Each block contains eight records, which contain
64-bit of information each. Each record contains the 48-Bit MAC address and provides the
necessary forwarding information as well as priority or time stamp information.
Two types of records are defined.
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1. Dynamic Record: The dynamic entry provides the MAC address together with a 10-bit
2. Static Multiport/Priority Record: Switch Management can also write static entries in
• x^8 + x^2 + x + 1 (0x07)
timestamp and destination port number. These entries are created by the learning function
based on received frames to enable forwarding of frames to dedicated ports. Dynamic
entries are deleted by the aging function if not updated.
the table, which can include priority information as well as multiple destination ports
for forwarding. The MAC address can be unicast or multicast. These records can be
used to for example, specify the ports to participate in a specific multicast domain or
to assign a MAC address based priority to a frame. The aging and learning functions
ignore static records.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Figure 29-8. Port Look-Up Overview
Destination
Address
CRC Based 8-Bit Hash
Code Calculation
CRC-8
1
Linear Search
2048x84
2
Miss
Hit
Destination
Port
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