Whiteboard Accessories User Manual

Chapter 3 Configuring Driver Parameters 45
TABLE 3-14 describes the transmit and receive MAC counters.
TABLE 3-14 TX and RX MAC Counters
Parameter Description Stable or Unstable
tx-collisions 16-bit loadable counter increments for
every frame transmission attempt that
resulted in a collision.
Stable
tx-first-collisions 16-bit loadable counter increments for
every frame transmission that
experienced a collision on the first
attempt, but was successfully
transmitted on the second attempt.
Unstable
tx-excessive-collisions 16-bit loadable counter increments for
every frame transmission that has
exceeded the Attempts Limit.
Unstable
tx-late-collisions 16-bit loadable counter increments for
every frame transmission that has
experienced a collision. It indicates the
number of frames that the TxMAC has
dropped due to collisions that occurred
after it has transmitted at least the
Minimum Frame Size number of bytes.
Usually this is an indication that there
is at least one station on the network
that violates the maximum allowed
span of the network.
Unstable
tx-defer-timer 16-bit loadable timer increments when
the TxMAC is deferring to traffic on the
network while it is attempting to
transmit a frame. The time base for the
timer is the media byte clock divided by
256.
Unstable
tx-peak-attempts 8-bit register indicates the highest
number of consecutive collisions per
successfully transmitted frame, that
have occurred since this register was
last read. The maximum value that this
register can attain is 255. A maskable
interrupt is generated to the software if
the number of consecutive collisions
per successfully transmitted frame
exceeds 255. This register will be
automatically cleared at 0 after it is
read.
Unstable