Altera Low Latency 40-Gbps Ethernet MAC and PHY MegaCore Bedienungsanleitung PDF herunterladen (Seite 138)

link is functioning properly. The statistics registers check the size of frames, which includes the following

fields:

• Size of the destination address

• Size of the source address

• Size of the data

• Four bytes of CRC

The TX statistics counters module is a synthesis option. The statistics registers are counters that are

implemented inside the CSR. When you turn on the Enable TX statistics parameter in the Low Latency

40-100GbE parameter editor, the counters are implemented in the CSR. When you turn off the Enable

TX statistics parameter in the Low Latency 40-100GbE parameter editor, the counters are not

implemented in the CSR, and read access to the counters returns read data equal to 0.

Reading the value of a statistics register does not affect its value. A configuration register at offset 0x845

allows you to clear all of the TX statistics counters.

To ensure that the counters you read are consistent, you should issue a shadow request to create a

snapshot of all of the TX statistics registers, by setting bit [2] of the configuration register at offset 0x845.

Until you reset this bit, the counters continue to increment but the readable values remain constant.

Table 3-28: Transmit Side Statistics Registers

Address Name- Description Access

0x800 CNTR_TX_

FRAGMENTS_LO

Number of transmitted frames less than 64 bytes and

reporting a CRC error (lower 32 bits)

0x801 CNTR_TX_

FRAGMENTS_HI

Number of transmitted frames less than 64 bytes and

reporting a CRC error (upper 32 bits)

0x802 CNTR_TX_

JABBERS_LO

Number of transmitted oversized frames reporting a CRC

error (lower 32 bits)

0x803 CNTR_TX_

JABBERS_HI

Number of transmitted oversized frames reporting a CRC

error (upper 32 bits)

0x804 CNTR_TX_FCS_LO Number of transmitted packets with FCS errors. (lower 32

bits)

0x805 CNTR_TX_FCS_HI Number of transmitted packets with FCS errors. (upper 32

bits)

0x806 CNTR_TX_CRCERR_

Number of transmitted frames with a frame of length at

least 64 reporting a CRC error (lower 32 bits)

0x807 CNTR_TX_CRCERR_

Number of transmitted frames with a frame of length at

least 64 reporting a CRC error (upper 32 bits)

0x808 CNTR_TX_MCAST_

DATA_ERR_LO

Number of errored multicast frames transmitted, excluding

control frames (lower 32 bits)

UG-01172

2015.05.04

TX Statistics Registers

3-93

Functional Description

Altera Corporation

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