MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1829

• 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

Chapter 29 Programmable 3-Port Ethernet Switch with QOS (SWITCH)
29.4.10.5 Protocol Snooping
The incoming frames are parsed for IPv4 and IPv6 headers and UDP/TCP if available. The
snooping function can be programmed to redirect specific protocols exclusively to the
management port. See section
IP Snooping
and
TCP/UDP Port Number Snooping
for a
description of the snooping options.
The snooping is active only for frames received from the external ports. When a frame is
transmitted from the management port itself, snooping does not apply and the frames are
forwarded normally (MAC lookup).
29.4.10.6 Bridge Protocol Frame Resolution
29.4.10.6.1 Overview
To implement bridge control protocols like the Spanning Tree protocol, the following control
functions are performed by the Protocol Frame Resolution function:
29.4.10.6.2 Input Port Blocking
The input port blocking function is used to avoid forwarding of frames after address learning.
The firmware can program the register
INPUT_LEARN_BLOCK
and if a frame is received
on a port N that should be blocked (blocking bit N=1) and the frame is not a bridge protocol
frame (see below), the frame will be marked for discard and will not be forwarded to any
output port.
29.4.10.6.3 Input Port Learning Disable
To reduce processing load from the firmware, a port can be configured for exclusion from
learning (see register INPUT_LEARN_BLOCK).
When learning is disabled on a port no source address extraction happens for incoming
frames, with the exception of incoming BPDU frames. BPDU frame source addresses are
always extracted and forwarded to the learning interface.
29.4.10.6.4 Management Port Forwarding
Bridge Protocol Frames are, if enabled, always forwarded to the dedicated management
port (see MGMT_CONFIG) independent of any address lookup or other resolution functions.
Bridge Protocol Frames are identified by its destination address being any of the following:
• 01-80-c2-00-00-00 to
01-80-c2-00-00-0F (Spanning Tree, IEEE 802.1d, Table 7-9)
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Freescale Semiconductor, Inc.
1829