DS33X82+ Maxim Integrated Products, DS33X82+ Datasheet - Page 74

• Manufacturer Part Number: DS33X82+
• Description: IC MAPPING ETHERNET 256CSBGA
• Manufacturer: Maxim Integrated Products

Specifications of DS33X82+

• Applications: Data Transport
• Interface: Serial
• Voltage - Supply: 1.8V, 2.5V, 3.3V
• Package / Case: 256-CSBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.17 OAM support with Frame Trapping, Extraction, and Insertion
The device has the ability to insert and extract frames from/to the host microprocessor from both the WAN interface
and the LAN interface. There are four user-accessible FIFOs for this purpose: one for WAN insertion, one for WAN
extraction, one for LAN insertion, and one for LAN extraction. Each FIFO has the ability to issue an interrupt when
it is empty (Insertion FIFOs) or has a frame available (Extraction FIFOs). In order for frames to be extracted by the
host microprocessor, they must first be “trapped”. The device has two “traps” for capturing frames for extraction –
the LAN Trap and the WAN Trap. The maximum frame size that may be trapped or inserted is 2048 bytes.
The LAN Trap (when appropriately enabled) inspects each frame received on the Ethernet interface for its Ethernet
Destination Address (DA), VLAN tag, Q-in-Q tag, and Ethernet Type. These parameters help to determine what to
do with each frame. The LAN Trap is logically located between the Ethernet MAC and the circuitry that performs
forwarding to the WAN groups.
The WAN Trap (when appropriately enabled) inspects each frame received on the Serial interface for its Ethernet
Destination Address (DA), VLAN tag, Q-in-Q tag, Ethernet Type, or user-programmable header value. The WAN
Header Trap enables trapping on SLARP, GFP PTI/UPI, GFP CID or Shim Tag. The WAN trap is logically located
after the line decoding functions (bit/byte destuffing, descrambling), and the Decapsulator packet processing
circuitry.
Note that SPI “Burst mode” is not applicable for frame insertion or extraction, due to the indirect access of the
extract and insert queues.
There are 6 Ethernet Frame Formats supported for QoS and OAM Frame Extraction. The supported frame formats
are diagramed in Figure 8-16 and include:
The user is not required to specify or configure an Ethernet frame format because it is normal for LAN traffic to
simultaneously carry multiple different Ethernet formats.
Rev: 063008
________________________________________________ DS33X162/X161/X82/X81/X42/X41/X11/W41/W11
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DIX
VLAN tagged DIX
Q-in-Q tagged DIX
802.3 LLC/SNAP
VLAN tagged 802.3 LLC/SNAP
Q-in-Q tagged 802.3 LLC/SNAP
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