ADM6926
Product Review
Chapter 1 Product Overview
1.1
Overview
The ADM6926 is a high performance/low cost, twenty six-port 10/100 Mbps Ethernet
Switch Controller with all ports supporting 10/100 Mbps full duplex switch function.
The ADM6926 is intended for applications to standalone-bridge for the low cost ether-
switch market. ADM6926 can be programmed trunking port active. The trunking port
can be connected to server or stacking two switch boxes to enhance the performance.
The ADM6926 also supports back-pressure in half duplex mode and 802.3x flow control
in full duplex mode. When back-pressure is enabled, and there is no receive buffer
available for the incoming packet, the ADM6926 will force a JAM pattern on the
receiving port in half duplex mode and transmit the 802.3x packet back to receiving end
in full duplex mode.
An intelligent address recognition algorithm makes ADM6926 to recognize up to 4096
different MAC addresses and enables filtering and forwarding at full wire speed.
The ADM6926 has embedded SRAM for the proprietary buffer management. The SRAM
is used to store the incoming/outgoing packets. These buffers provide elastic storage for
transferring data between low-speed and high-speed segments and buffers are efficiently
allocated to improve the efficiency.
1.2
Features
•
Support twenty four 10/100M auto-detect Half/Full duplex switch ports with SS-SMII
interface and two 10/100M Half/Full duplex port with RMII/MII interface
•
Supports up to 4096 MAC addresses table (4-way hashing)
•
Support two queue for QOS (1:2 or 1:4 or 1:8 or 1:16)
•
Support Port-base, 802.1p and IP TOS priority
•
Supports store & forward architecture and Performs forwarding and filtering at non-
blocking full wire speed
•
Support buffer allocation with 256 bytes each
•
Supports aging function and 802.3x flow control for full duplex and back-pressure
function for half duplex operation in case buffer is full
•
Support packet length up to 1536 bytes
•
Support Congestion Flow Control
•
Broadcast storm filter and Alert LED
•
Port-base VLAN and adjustable VLAN to support up to 32 VLAN group
•
serial CPU interface for counter and port status output
•
CPU can see-through to access PHY
•
flexible port trunking on fault tolerance and load balance
ADMtek Inc.
1-1
•
per port 32bits smart counter for Rx/Tx byte/packet count, error count and collision
count
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