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100VG-AnyLAN Training
B-2
B.1 100VG-AnyLAN Training
The algorithm used to open ThunderLAN to the network depends on the net-
work protocol in use. The demand priority protocol specified in IEEE 802.12
goes through a training process to open onto the wire. To open the controller
the driver must:
Enter VG training; the network protocol is demand priority.
Issue a dummy interrupt by asserting Req_Int in the HOST_CMD register.
Wait one second for this interrupt to process. If the interrupt is handled,
then ThunderLAN is open on the wire. Otherwise, it is not.
Training between the client and hub is accomplished by exchanging 24 con-
secutive frames (training frames) between the client and hub. These 24
frames must be exchanged within a window consisting of 48 frames. If training
is not accomplished within this window, it can continue after a suitable delay
in another 48-frame window.
The following shows the format of an 802.12 training frame:
Figure B–1. 802.12 Training Frame Format
Data = null
Private protocol information
Allow config
Req config
Source address
Destination address = 0x000000000000h
bytes
539–620
55 bytes
2 bytes
2 bytes
6 bytes
6 bytes