VSC7440 datasheet(66/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

To enable FEC, PCS_10GBASE_R::KR_FEC_CFG.FEC_ENA must be set. In addition, data bits must be

flipped at KR FEC interface with PCS. This is achieved by setting both

PCS_10GBASE_R::KR_FEC_CFG.TX_DATA_FLIP and

PCS_10GBASE_R::KR_FEC_CFG.RX_DATA_FLIP to 1.

For enabling FEC error indication in the PCS register bit, set

PCS_10GBASE_R::KR_FEC_CFG.ENABLE_ERROR_INDICATION to 1. This ensures that SFI PCS

decodes the block correctly, and hence correct data is presented to MAC. When FEC looses frame lock,

it is reflected in the PCS_10GBASE_R::KR_FEC_STICKY.FEC_FRAME_LOCK_STICKY sticky bit.

There are two counters in FEC for counting corrected and uncorrected error blocks. These are cleared

by writing a 1 to PCS_10GBASE_R::KR_FEC_CFG.RESET_MONITOR_COUNTERS, followed by a 0.

When the counters cross a threshold value configurable by

PCS_10GBASE_R::FIXED_ERROR_COUNT_THRESHOLD and

PCS_10GBASE_R::UNFIXABLE_ERROR_COUNT_THRESHOLD, two corresponding sticky bits are set

(PCS_10GBASE_R::KR_FEC_STICKY.FEC_FIXED_ERROR_COUNT_STICKY and

PCS_10GBASE_R::KR_FEC_STICKY.FEC_UNFIXABLE_ERROR_COUNT_STICKY).

Note: KR FEC must not be enabled when EEE is enabled. This mode is not supported.

3.10.3

Port Statistics

The DEV10G port module contains a set of port statistics. Packets counters are 32 bits wide and byte

counters are 40 bits wide. The following table lists the counters. The counters are writable. In particular,

the counters are cleared by writing a 0 to each counter.

Table 29 •

DEV10G Statistics Registers Overview

Description

RX_SYMBOL_ERR_CNT

Rx symbol carrier error counter

RX_PAUSE_CNT

Rx pause frame counter

RX_UNSUP_OPCODE_CNT

Rx Control frame counter

RX_UC_CNT

Rx unicast frame counter

RX_MC_CNT

Rx multicast frame counter

RX_BC_CNT

Rx broadcast frame counter

RX_CRC_ERR_CNT

Rx CRC error counter

RX_UNDERSIZE_CNT

Rx undersize counter (valid frame format)

RX_FRAGMENTS_CNT

Rx undersize counter (CRC error)

RX_IN_RANGE_LEN_ERR_CNT

Rx in-range length error counter

RX_OUT_OF_RANGE_LEN_ERR_CNT

Rx out-of-range length error counter

RX_OVERSIZE_CNT

Rx oversize counter (valid frame format)

RX_JABBERS_CNT

Rx jabbers counter

RX_SIZE64_CNT

Rx 64 byte frame counter

RX_SIZE65TO127_CNT

Rx 65-127 byte frame counter

RX_SIZE128TO255_CNT

Rx 128-255 byte frame counter

RX_SIZE256TO511_CNT

Rx 256-511 byte frame counter.

RX_SIZE512TO1023_CNT

Rx 512-1023 byte frame counter.

RX_SIZE1024TO1518_CNT

Rx 1024-1518 byte frame counter.

RX_SIZE1519TOMAX_CNT

Rx 1519 to max. length byte frame counter.

RX_IPG_SHRINK_CNT

Rx Inter packet gap shrink counter.

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