VSC7440 datasheet(347/444 Pages) MICROSEMI

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VCore-III System and CPU Interfaces

VMDS-10492 VSC7440 Datasheet Revision 4.2

330

Figure 111 •

FDMA Channel Interrupt Hierarchy

4.7.5

FDMA Extraction

During extraction, the FDMA extracts Ethernet frame data from the Queuing System and saves it into the

data block of the DCB that is currently loaded by the FDMA extraction channel. The FDMA continually

processes DCBs until it reaches a DCB with LLP = NULL or until it is disabled.

When an extraction channel writes the status word of a DCB, it updates SOF/EOF/ABORT/PRUNED-

indications and BLOCKL. BLOCKO remains unchanged (write value is taken from the value that was

read when the DCB was loaded).

Aborting frames from the queuing system will not occur during normal operation. If the queuing system is

reset during extraction of a particular frame, then ABORT and EOF is set. Software must discard frames

that have ABORT set.

Pruning of frames during extraction is enabled per extraction port through

XTR_FRM_PRUNING[group].PRUNE_SIZE. When enabled, Ethernet frames above the configured size

are truncated, and PD and EOF is set.

4.7.6

FDMA Injection

During injection, the FDMA reads Ethernet frame data from the data block of the DCB that is currently

loaded by the FDMA injection channel and injects this into the queuing system. The FDMA continually

processes DCBs until it reaches a DCB with LLP = NULL or until it is disabled.

When an injection channel writes the status word of a DCB, it sets DONE indication. All other status word

fields remain unchanged (write value is stored the first time the injection channel loads the DCB).

INTR_LLP[ch]

INTR_LLP_ENA[ch]

AND

INTR_IDENT[ch]

AND

INTR_ENA[ch]

EVT_ERR[ch]

INTR_FRM[ch]

INTR_FRM_ENA[ch]

AND

INTR_SIG[ch]

INTR_SIG_ENA[ch]

AND

INTR_XTR_SOF_RDY

INTR_XTR_SOF_RDY_ENA

AND

INTR_XTR_ANY_RDY

INTR_XTR_SOF_ANY_ENA

AND

INTR_INJ_RDY

INTR_INJ_RDY_ENA

AND

Only for highest numbered extraction channel

Only for highest numbered injection channel

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