Sun Microsystems 806-2989-10 manual Flow Control Parameters

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 4-3provides flow control keywords and describes their function.

TABLE 4-3Read-Write Flow Control Keyword Descriptions

KeywordDescription

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.

28 Sun GigaSwift Ethernet Adapter Installation and User’s Guide • February 2001