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28 Sun GigaSwift Ethernet Adapter Installation and User’s Guide • February 2001
Flow Control Parameters
The ce device is capable of sourcing (transmitting) and terminating (receiving)
pause frames conforming to the IEEE 802.3x Frame Based Link Level Flow Control
Protocol. In response to received flow control frames, the ce device can slow down
its transmit rate. On the other hand, the ce device is capable of sourcing flow control
frames, requesting the link partner to slow down, provided that the link partner
supports this feature. By default, the driver advertises both transmit and receive
pause capability during autonegotiation.
TABLE 4-3 provides flow control keywords and describes their function.
TABLE 4-3 Read-Write Flow Control Keyword Descriptions
Keyword Description
adv_asmpause_cap The adapter supports asymmetric pause, which means it
can pause only in one direction.
0=Off (default)
1=On
adv_pause_cap This parameter has two meanings depending on the
value of adv_asmpause_cap. (Default=0)
If adv_asmpause_cap = 1 while adv_pause_cap =1
pauses are received.
If adv_asmpause_cap = 1 while adv_pause_cap =0
pauses are transmitted.
If adv_asmpause_cap = 0 while adv_pause_cap =1
pauses are sent and received.
If adv_asmpause_cap = 0 then adv_pause_cap
determines whether Pause capability is on or off.