PXN20RM Datasheet, PDF (574/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Fast Ethernet Controller (FEC)
25.3.3 MIB Block Counters Memory Map
Table 25-3 defines the MIB Counters memory map which defines the locations in the MIB RAM space
where hardware-maintained counters reside. These fall in the 0xFFF4_C200 – 0xFFF4_C3FF address
offset range. The counters are divided into two groups.
• RMON counters are included which cover the Ethernet Statistics counters defined in RFC 1757. In
addition to the counters defined in the Ethernet Statistics group, a counter is included to count
truncated frames as the FEC only supports frame lengths up to a maximum of 2047 bytes. The
RMON counters are implemented independently for transmit and receive to ensure accurate
network statistics when operating in full duplex mode.
• IEEEcounters are included which support the Mandatory and Recommended counter packages
defined in section 5 of ANSI/IEEE Std. 802.3 (1998 edition). The IEEE Basic Package objects are
supported by the FEC but do not require counters in the MIB block. In addition, some of the
recommended package objects which are supported do not require MIB counters. Counters for
transmit and receive full duplex flow control frames are included as well.
Table 25-3. MIB Counters Memory Map
Offset from
FEC_BASE
(0xFFF4_C000)¹
0x0200
0x0204
0x0208
0x020C
0x0210
0x0214
0x0218
0x021C
0x0220
0x0224
0x0228
0x022C
0x0230
0x0234
0x0238
0x023C
0x0240
0x0244
0x0248
Mnemonic
RMON_T_DROP
RMON_T_PACKETS
RMON_T_BC_PKT
RMON_T_MC_PKT
RMON_T_CRC_ALIGN
RMON_T_UNDERSIZE
RMON_T_OVERSIZE
RMON_T_FRAG
RMON_T_JAB
RMON_T_COL
RMON_T_P64
RMON_T_P65TO127
RMON_T_P128TO255
RMON_T_P256TO511
RMON_T_P512TO1023
RMON_T_P1024TO2047
RMON_T_P_GTE2048
RMON_T_OCTETS
IEEE_T_DROP
Description
Count of frames not counted correctly
RMON Tx packet count
RMON Tx Broadcast Packets
RMON Tx Multicast Packets
RMON Tx Packets w CRC/Align error
RMON Tx Packets < 64 bytes, good crc
RMON Tx Packets > MAX_FL bytes, good crc
RMON Tx Packets < 64 bytes, bad crc
RMON Tx Packets > MAX_FL bytes, bad crc
RMON Tx collision count
RMON Tx 64 byte packets
RMON Tx 65 to 127 byte packets
RMON Tx 128 to 255 byte packets
RMON Tx 256 to 511 byte packets
RMON Tx 512 to 1023 byte packets
RMON Tx 1024 to 2047 byte packets
RMON Tx packets w > 2048 bytes
RMON Tx Octets
Count of frames not counted correctly
25-8
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor