MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 1821
MCIMX281AVM4B
Manufacturer Part Number
MCIMX281AVM4B
Description
IC MPU I.MX28 1.2 289MAPBGA
Manufacturer
Freescale Semiconductor
Series
i.MX28r
Datasheets
1.MCIMX283DVM4B.pdf
(2327 pages)
2.MCIMX283DVM4B.pdf
(20 pages)
3.MCIMX281AVM4B.pdf
(72 pages)
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
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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
1821
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