5.1.2. Statistics Counters (Dword Offset 0x18 – 0x38)
The following table describes the read-only registers that collect the statistics on the transmit and receive datapaths. A hardware reset clears these registers; a software reset also clears these registers except aMacID. The statistics counters roll up when the counter is full.
The register description uses the following definitions:
- Good frame—error-free frames with valid frame length.
- Error frame—frames that contain errors or whose length is invalid.
- Invalid frame—frames that are not addressed to the MAC function. The MAC function drops this frame.
|0x18 – 0x19||aMacID||RO||The MAC address. This register is wired to the primary MAC address in the mac_0 and mac_1 registers.|
|0x1A||aFramesTransmittedOK||RO||The number of frames that are successfully transmitted including the pause frames.|
|0x1B||aFramesReceivedOK||RO||The number of frames that are successfully received including the pause frames.|
|0x1C||aFrameCheckSequenceErrors||RO||The number of receive frames with CRC error.|
|0x1D||aAlignmentErrors||RO||The number of receive frames with alignment error.|
|0x1E||aOctetsTransmittedOK||RO||The number of data and padding octets that are successfully transmitted.
This register contains the lower 32 bits of the aOctetsTransmittedOK counter. The upper 32 bits of this statistics counter reside at the dword offset 0x0F.
|0x1F||aOctetsReceivedOK||RO||The number of data and padding octets that are successfully received, including pause frames.
The lower 32 bits of the aOctetsReceivedOK counter. The upper 32 bits of this statistics counter reside at the dword offset 0x3D.
|0x20||aTxPAUSEMACCtrlFrames||RO||The number of pause frames transmitted.|
|0x21||aRxPAUSEMACCtrlFrames||RO||The number received pause frames received.|
The number of errored frames received with one of the following errors:
|0x23||ifOutErrors||RO||The number of transmit frames with one the following errors:
|0x24||ifInUcastPkts||RO||The number of valid unicast frames received.|
|0x25||ifInMulticastPkts||RO||The number of valid multicast frames received. The count does not include pause frames.|
|0x26||ifInBroadcastPkts||RO||The number of valid broadcast frames received.|
|0x28||ifOutUcastPkts||RO||The number of valid unicast and erroneous frames transmitted, as well as unicast frames transmitted during late and excessive collision occasions.|
|0x29||ifOutMulticastPkts||RO||The number of valid multicast frames transmitted, as well as multicast frames transmitted during late and excessive collision occasions, excluding pause frames.|
|0x2A||ifOutBroadcastPkts||RO||The number of valid and erroneous broadcast frames transmitted, as well as broadcast frames transmitted during late and excessive collision occasions.|
|0x2B||etherStatsDropEvents||RO||The number of frames that are dropped due to MAC internal errors when FIFO buffer overflow persists.|
|0x2C||etherStatsOctets||RO||The total number of octets received. This count includes both good and errored frames.
This register is the lower 32 bits of etherStatsOctets. The upper 32 bits of this statistics counter reside at the dword offset 0x3E.
|0x2D||etherStatsPkts||RO||The total number of good and errored frames received.|
|0x2E||etherStatsUndersizePkts||RO||The number of frames received with length less than 64 bytes, including pause frames. This count does not include errored frames.|
|0x2F||etherStatsOversizePkts||RO||The number of frames received that are longer than the value configured in the frm_length register. This count does not include errored frames.|
|0x30||etherStatsPkts64Octets||RO||The number of 64-byte frames received. This count includes good and errored frames.|
|0x31||etherStatsPkts65to127Octets||RO||The number of received good and errored frames between the length of 65 and 127 bytes.|
|0x32||etherStatsPkts128to255Octets||RO||The number of received good and errored frames between the length of 128 and 255 bytes.|
|0x33||etherStatsPkts256to511Octets||RO||The number of received good and errored frames between the length of 256 and 511 bytes.|
|0x34||etherStatsPkts512to1023Octets||RO||The number of received good and errored frames between the length of 512 and 1023 bytes.|
|0x35||etherStatsPkts1024to1518Octets||RO||The number of received good and errored frames between the length of 1024 and 1518 bytes.|
|0x36||etherStatsPkts1519toXOctets||RO||The number of received good and errored frames between the length of 1519 and the maximum frame length configured in the frm_length register.|
|0x37||etherStatsJabbers||RO||Too long frames with CRC error.|
|0x38||etherStatsFragments||RO||Too short frames with CRC error.|
|Extended Statistics Counters (0x3C – 0x3E)|
|0x3C||msb_aOctetsTransmittedOK||RO||Upper 32 bits of the respective statistics counters. By default, all statistics counters are 32 bits wide. These statistics counters can be extended to 64 bits by turning on the Enable 64-bit byte counters parameter.
To read the counter, read the lower 32 bits first, then followed by the extended statistic counter bits.