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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

3.11

Assembler

The assembler (ASM) block is responsible for collecting words from the smaller taxi bus and assembling

them into cells. It is also responsible for the loopback path between the rewriter and the analyzer.

For the first cell of a frame, which is the SOF cell, the assembler adds room for a 28-byte internal frame

header (IFH). On a stacking port, the stacking tag is extracted from the frame data and placed in the

respective part of the IFH.

The assembler receives a calendar sequence from the queue system defining in the sequence the ports

should be served on the outgoing cell bus.

The assembler also detects PAUSE frames and forwards the extracted PAUSE information to the

disassembler. PFC pause information extracted from PFC PAUSE frames are forwarded to the queue

system.

Finally, the assembler collects the port statistics for all lower speed ports, which are the DEV1G and

DEV2G5 ports. Statistics for the high-speed DEV10G ports are handled locally in the port module.

3.11.1

Setting Up a Port in the Assembler

The following table lists the port configuration registers within the assembler. Ethernet ports and CPU

ports are configured using the same registers. Some of the fields are only relevant for setting up a CPU

port (internal or external) and they will be covered in a later section.

TX_PAUSE_CNT

Tx Pause frame counter.

TX_UC_CNT

Tx unicast frame counter.

TX_MC_CNT

Tx multicast frame counter.

TX_BC_CNT

Tx broadcast frame counter.

TX_SIZE64_CNT

Tx 64 byte frame counter.

TX_SIZE65TO127_CNT

Tx 65-127 byte frame counter.

TX_SIZE128TO255_CNT

Tx 128-255 byte frame counter.

TX_SIZE256TO511_CNT

Tx 256-511 byte frame counter.

TX_SIZE512TO1023_CNT

Tx 512-1023 byte frame counter.

TX_SIZE1024TO1518_CNT

Tx 1024-1518 byte frame counter.

TX_SIZE1519TOMAX_CNT

Tx 1519 to max. length byte frame counter.

RX_ALIGNMENT_LOST_CNT

Counter to track the dribble-nibble (extra nibble) errors in frames.

RX_TAGGED_FRMS_CNT

Counts frames that are tagged (C-tagged or S-tagged).

RX_UNTAGGED_FRMS_CNT

Counts frames that are Not tagged (neither C-tagged nor S-tagged).

TX_TAGGED_FRMS_CNT

Counts frames that are tagged (C-tagged or S-tagged).

TX_UNTAGGED_FRMS_CNT

Counts frames that are Not tagged (neither C-tagged nor S-tagged).

RX_HIH_CKSM_ERR_CNT

Rx HiH checksum error counter.

RX_XGMII_PROT_ERR_CNT

Rx XGMII protocol error counter.

Table 30 •

Port Configuration Register Overview

Target::Register.Field

Description

Replication

ASM::PORT_CFG.NO_PREAMBLE_ENA

Preamble configuration of incoming frames.

Per port

ASM::PORT_CFG.SKIP_PREAMBLE_ENA

Preamble configuration of incoming frames.

Per port

Table 29 •

DEV10G Statistics Registers Overview (continued)

Description

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