AL103 Revision 1.0
Table 20: System Configuration Register I (Register 00) (Continued)
3
L2Trunk
Layer 2 Trunk Loading Method.
0: Port based loading. Trunking decisions will be based on Trunk Port
Assignment Registers.
1: MAC address based loading. Trunking decisions will be based on
source port MAC addresses.
2
TimeoutEN
Reserved
Frame Time Out Enable.
0: Device will not timeout frames based on MaxDelay.
1: Device will timeout frames.
1~0
Reserved (Must set to 00).
Table 21: System Configuration Register II (Register 01)
BIT
NAME
DESCRIPTION
15~8
MaxAge
Maximum Age For Dynamically Learned MAC Entries.
0000 0000: 1 sec. to 1111 1111: 256 sec.
7~6
5~4
MaxDelay
MaxStorm
Maximum Frame Transition Delay Through The Switch.
00: 1 second.
01: 2 seconds.
10: 3 seconds.
11: 4 seconds.
Maximum Number of Broadcast Frames That Can Be Accumulated In
Each Input Frame Buffer.
00: 16 frames.
01: 32 frames.
10: 48 frames.
11: 64 frames.
3
2
SuperMAC
REC
0: Disable. Device will perform the IEEE standard exponential back-off
algorithm when a collision occurs.
1: Enable. When collisions occur, the AL103 will back off up to 3 slots.
Retry on Excessive Collision.
0: Normal collision handling.
1: Retry transmission after 16 consecutive collisions.
1~0
L2TbitSel
Select the Bits Position for MAC Address To Trunk Assignment.
00: Source MAC address [1:0].
01: Source MAC address [3:2].
10: Source MAC address [5:4].
11: Source MAC address [7:6].
9/00
Reference Only / Allayer Communications
40
ABC [ ABC Taiwan Electronics Corp ]
