User guide

Usin
g
the Network Options Ethernet Tester
50
840 USE 115 00 Version 1.0
Receive Interrupts and Transmit Interrupts. The number of times the PCNET
controller chip has
g
enerated interrupts.
Transmit timeout errors. The number of times the transmitter has been on the
channel lon
g
er than the interval re
q
uired to send the maximum len
g
th frame of
1519 b
y
tes. This is also known as a babble error.
Collision errors. The number of collisions detected b
y
the Ethernet chip.
Missed packet errors. The number of times a received frame was dropped
because a receive descriptor was not available.
Memor
y
errors. The number of times an Ethernet controller chip experienced
an error accessin
g
shared RAM. A memor
y
error will cause a restart.
PcNet restart count. The number of times the Ethernet controller chip was
restarted due to fatal runtime errors, includin
g
memor
y
errors, transmit buffer
errors and transmit underflow.
Framin
g
error. The number of times an incomin
g
frame contained a non-
inte
g
er multiple of ei
g
ht bits.
Overflow errors. The number of times the receiver has lost part or all of an
incomin
g
frame, due to an inabilit
y
to store the frame in memor
y
before the
internal FIFO overflowed.
CRC errors. The number of times a CRC
(
FCS
)
error was detected on an
incomin
g
frame.
Receive buffer errors. The number of times a receive buffer was not available
while data chainin
g
a received frame.
Transmit buffer errors. The number of times the end packet fla
g
on the current
buffer was not set and the Ethernet controller did not own the next buffer. A
transmit buffer error causes a restart.
Silo Underflow. The number of times a packet was truncated due to data late
from memor
y
. A Silo Underflow will cause a restart.
Late Collision. The number of times a collision was detected after the slot time
of the channel had elapsed.
Lost Carrier. The number of times a carrier was lost durin
g
a transmission.
Transmit retries. The number of times the transmitter has failed after 16
attempts to transmit a messa
g
e, due to repeated collisions.
These statistics also ma
y
be obtained from the MSTR block. Refer to the
Ladder
Logic Block Library User Guide
for details.