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32 Sun Crypto Accelerator 4000 Board Installation and User’s Guide • May 2003
PCI Bus Interface Parameters
These parameters allow you to modify PCI interface features to gain better PCI
interperformance for a given application.
TABLE 3-9 PCI Bus Interface Parameters
Parameter Description
tx-dma-weight Determines the multiplication factor for granting credit to the
transmit (TX) side during a weighted round robin arbitration; the
values are 0 to 3 (Default=0). Zero means no extra weighting. The
other values are power of 2 extra weighting on that traffic. For
example, if tx-dma-weight = 0 and rx-dma-weight = 3, then as
long as RX traffic is continuously arriving, the priority of RX traffic
will be 8 times greater than the priority of TX traffic to access the
PCI.
rx-dma-weight Determines the multiplication factor for granting credit to the RX
side during a weighted round robin arbitration. The values are 0 to
3 (Default=0).
infinite-burst Allows the infinite burst capability to be used when this parameter
is enabled and the system supports infinite burst. The adapter will
not free the bus until complete packets are transferred across the
bus. The values are 0 or 1 (Default=0).
disable-64bit Switches off 64-bit capability of the adapter.
Note: for UltraSPARC
®
III based platforms, this parameter may be
set to 1 by default. For UltraSPARC II based platforms, the default is
0. The values are 0 or 1 (Default=0, which enables 64-bit capability).