Sun Microsystems 4000 manual Tx-underrun

TABLE 3-14TX and RX MAC Counters (Continued)

Parameter	Description	Stable or Unstable
tx-underrun	16-bit loadable counter increments after	Unstable
	a valid frame has been received from
	the network.
rx-length-err	16-bit loadable counter increments after	Unstable
	a frame, whose length is greater than
	the value that was programmed in the
	Maximum Frame Size Register, has
	been received from the network.
rx-alignment-err	16-bit loadable counter increments	Unstable
	when an alignment error is detected in
	a receive frame. An alignment error is
	reported when a receive frame fails the
	CRC checking algorithm, AND the
	frame contains a noninteger number of
	bytes (that is, the frame size in bits
	modulo 8 is not equal to zero).
rx-crc-err	16-bit loadable counter increments	Unstable
	when a receive frame fails the CRC
	checking algorithm, AND the frame
	contains an integer number of bytes
	(that is, the frame size in bits modulo 8
	is equal to zero).
rx-code-violations	16-bit loadable counter increments	Unstable
	when an Rx_Err indication is generated
	by the XCVR over the MII, while a
	frame is being received. This indication
	is generated by the transceiver when it
	detects an invalid code in the received
	data stream. A receive code violation is
	not counted as an FCS or an Alignment
	error.
rx-overflows	Number of Ethernet frames dropped	Unstable
	due to lack of resources.
rx-no-buf	Number of times the hardware cannot	Unstable
	receive data because there is no more
	receive buffer space.
rx-no-comp-wb	Number of times the hardware cannot	Unstable
	post completion entries for received
	data.
rx-len-mismatch	Number of received frames where the	Unstable
	asserted length does not match the
	actual frame length.

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