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Resetting
3-9
Initializing and Resetting
3.2.2 Software Reset
The driver needs to reset ThunderLAN at startup when an adapter check inter-
rupt occurs or when an upper layer requires the driver to do so. ThunderLAN
may only need to be reinitialized when link is lost. To reset ThunderLAN the
driver must:
1) Clear the statistics by reading the statistics registers
2) Issue a reset command to ThunderLAN by asserting the Ad_Rst bit in the
HOST_CMD register
3) Disable interrupts by asserting the Ints_off bit in HOST_CMD
4) Setup the Areg and HASH registers for Rx address recognition
5) Setup the NetConfig register for the appropriate options
6) Setup the BSIZEreg register for the correct burst size
7) Setup the correct Tx commit level in the Acommit register
8) Load the appropriate interrupt pacing timer in Ld_Tmr in HOST_CMD
9) Load the appropriate Tx threshold value in Ld_Thr in HOST_CMD
10) Unreset the MII by asserting NMRST in
NetSio
11) Initialize the PHY layer
12) Setup the network status mask register, NetMask
13) Reenable interrupts by asserting the Ints_on bit in HOST_CMD