Functional Description
Notes for the Rx Statistics Summary:
1. “AND” is assumed horizontally across the table between all conditions which form the statistic (marked y or n) except where (y|y), meaning
“OR” is indicated. Parentheses are significant.
2. “-“ indicates conditions which are ignored in the formations of the statistic.
3. Statistics marked “Rx+Tx” are formed by summing the Rx and Tx statistics, each of which is formed independently.
4. The non-pause column refers to all MAC control frames (i.e. frames with length/type=88.08) with opcodes other than 0x0001. The pauseframe
column refers to MAC frames with the opcode=0x0001.
5. The multicast, broadcast and unicast columns in the table refer to non-MAC Control/non-pause frames (i.e. data frames).
6. “%” If either a MAC control frame or pause frame has a multicast or broadcast destination address then the appropriate statistics will be
updated.
7. “y^” Frame fragments are not counted if less than 8 bytes.
8. flow coll. are half-duplex collisions forced by the MAC to achieve flow-control. A collision will be forced during the first 8 bytes so should not
show in frame fragments. Some of the ‘-‘s in this column might in reality be ‘n’s.
9. The rx_overruns stat show above is for rx_mof_overruns and rx_sof_overruns added together.
Table 14-20. Tx Statistics Summary
Frame Type
Frame Size (bytes)
Event
MAC control
Data
Collision Type
Tx/
Frame/
1024
No
Und
Paus
Tx Statistic
Rx+
65-
128-
256-
512-
>
CRC
Que
Defe
Any
Multi
Broa
Oct
64
-
Carri
er-
e
Uni-
2-
Tx
127
255
511
1023
1535 Error
ued
rred
(CP
-
d-
Flow
1
16
Late
1535
er
run
(MA
cast
15
U)
cast
cast
C)
Good Tx Frames
F
Tx
(y|
y|
y|
y|
y)
(y|
y|
y|
y|
y|
y|
y)
-
-
-
-
n
n
n
-
-
n
Broadcast Tx
F
Tx
n
(%|
n
y)
n
(y|
y|
y|
y|
y|
y|
y)
-
-
-
-
n
n
n
-
-
n
Frames
Multicast Tx
F
Tx
(y|
%|
y)
n
n
y|
y|
y|
y|
y|
y|
y)
-
-
-
-
n
n
n
-
-
n
Frames
Pause Tx Frames
F
Tx
y
n
n
n
n
y
n
n
n
n
n
n
-
-
-
-
-
-
-
-
-
-
Collisions
F
Tx
n
(y|
y|
y|
y)
(y|
y|
y|
y|
y|
y|
y)
-
(+
+
+
+
+)
n
-
-
-
Single Collision Tx
F
Tx
n
(y|
y|
y|
y)
(y|
y|
y|
y|
y|
y|
y)
-
-
y
n
n
n
n
-
-
-
Frames
Multiple Collision
F
Tx
n
(y|
y|
y|
y)
(y|
y|
y|
y|
y|
y|
y)
-
-
n
y
n
n
n
-
-
-
Tx Frames
Excessive
F
Tx
n
(y|
y|
y|
y)
(y|
y|
y|
y|
y|
y|
y)
-
-
n
n
y
n
n
-
-
-
Collisions
Late Collisions
F
Tx
n
(y|
y|
y|
y)
n
(y|
y|
y|
y|
y|
y)
-
-
-
-
-
y
-
-
-
-
Deferred Tx
F
Tx
n
(y|
y|
y|
y)
(y|
y|
y|
y|
y|
y|
y)
-
-
n
n
n
n
n
-
y
n
Frames
1220Ethernet Subsystem
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated