VSC7440 datasheet(342/444 Pages) MICROSEMI

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VCore-III System and CPU Interfaces

VMDS-10492 VSC7440 Datasheet Revision 4.2

325

4.7

Frame DMA

This section describes the Frame DMA engine (FDMA). When FDMA is enabled, Ethernet frames can be

extracted or injected autonomously to or from the device’s DDR3/DDR3L memory and/or PCIe memory

space. Linked list data structures in memory are used for injecting or extracting Ethernet frames. The

FDMA generates interrupts when frame extraction or injection is done and when the linked lists needs

updating.

Table 244 •

FDMA Registers

Description

DEVCPU_QS::XTR_GRP_CFG

CPU port ownership, extraction direction.

DEVCPU_QS::INJ_GRP_CFG

CPU port ownership, injection direction.

DEVCPU_QS::INJ_CTRL

Injection EOF to SOF spacing.

ASM::PORT_CFG

Enables IFH and disables FCS recalculation (for injected

frames).

ICPU_CFG::FDMA_CH_CFG

Channel configuration, priorities, and so on.

ICPU_CFG::FDMA_CH_ACTIVATE

Enables channels.

ICPU_CFG::FDMA_CH_DISABLE

Disables channels.

ICPU_CFG::FDMA_CH_STAT

Status for channels.

ICPU_CFG::FDMA_CH_SAFE

Sets when safe to update channel linked lists.

ICPU_CFG::FDMA_DCB_LLP

Linked list pointer for channels.

ICPU_CFG::FDMA_DCB_LLP_PREV

Previous linked list pointer for channels.

ICPU_CFG::FDMA_CH_CNT

Software counters for channels.

ICPU_CFG::FDMA_INTR_LLP

NULL pointer event for channels.

ICPU_CFG::FDMA_INTR_LLP_ENA

Enables interrupt on NULL pointer event.

ICPU_CFG::FDMA_INTR_FRM

Frame done event for channels.

ICPU_CFG::FDMA_INTR_FRM_ENA

Enables interrupt on frame done event.

ICPU_CFG::FDMA_INTR_SIG

SIG counter incremented event for channels.

ICPU_CFG::FDMA_INTR_SIG_ENA

Enables interrupt on SIG counter event.

ICPU_CFG::MANUAL_INTR

Manual injection/extraction events.

ICPU_CFG::MANUAL_INTR_ENA

Enables interrupts on manual injection/extraction events.

ICPU_CFG::FDMA_EVT_ERR

Error event for channels.

ICPU_CFG::FDMA_EVT_ERR_CODE

Error event description.

ICPU_CFG::FDMA_INTR_ENA

Enables interrupt for channels.

ICPU_CFG::FDMA_INTR_IDENT

Currently interrupting channels.

DEVCPU_QS::XTR_FRM_PRUNING

Enables pruning of extraction frames.

ICPU_CFG::FDMA_CH_INJ_TOKEN_CNT

Injection tokens.

ICPU_CFG::FDMA_CH_INJ_TOKEN_TICK_RLD

Periodic addition of injection tokens.

ICPU_CFG::MANUAL_CFG

Configures manual injection/extraction.

ICPU_CFG::MANUAL_XTR

Memory region used for manual extraction.

ICPU_CFG::MANUAL_INJ

Memory region used for manual injection.

DEVCPU_QS::INJ_CTRL

Configures injection gap.

ICPU_CFG::FDMA_GCFG

Configures injection buffer watermark.

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