Gigabit Forced Mode Parameter

TABLE 3-3Read-Write Flow Control Keyword Descriptions

Keyword	Description

	1	0	Pauses are transmitted but are not
			received.
	0	1	Pauses are sent and received.
	0	1 or 0	adv-pause-cap determines
			whether the pause capability is on
			or off.

pause-on-thresholdDefines the number of 64 byte blocks in the receive (RX) FIFO which causes the board to generate an XON-PAUSE frame.

pause-off-thresholdDefines the number of 64 byte blocks in the RX FIFO which causes the board to generate an XOFF-PAUSE frame.

For Gigabit links, this parameter determines the link-master. Generally, switches are enabled as a link master; in which case, this parameter can remain unchanged. If this is not the case, then the link-masterparameter can be used to enable the vca device as a link master.

TABLE 3-4Gigabit Forced Mode Parameter

Parameter	Description

link-master	When set to 1 this parameter enables master operation, assuming
	the link partner is a slave.
	When set to 0 this parameter enables slave operation, assuming the
	link partner is a master. (default)

Interpacket Gap Parameters

The vca device supports a programmable mode called enable-ipg0.

Before transmitting a packet with enable-ipg0enabled (default), the vca device adds an additional time delay. This delay, set by the ipg0 parameter, is in addition to the delay set by the ipg1 and ipg2 parameters. The additional ipg0 delay reduces collisions.

If enable-ipg0is disabled, the value of ipg0 is ignored and no additional delay is set. Only the delays set by ipg1 and ipg2 will be used. Disable enable-ipg0if other systems keep sending a large number of continuous packets. Systems that

28 Sun Crypto Accelerator 4000 Board Installation and User’s Guide • May 2003

4000 specifications

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Sun Microsystems 4000 manual Gigabit Forced Mode Parameter, Interpacket Gap Parameters

Models: 4000

TABLE 3-3Read-Write Flow Control Keyword Descriptions