VSC7440 datasheet(379/444 Pages) MICROSEMI

379 / 444 page

VCore-III System and CPU Interfaces

VMDS-10492 VSC7440 Datasheet Revision 4.2

362

The following table lists the registers associated with the memory integrity monitor.

The memory integrity monitor looks for memory soft-error indications. Correctable (single bit) and non-

correctable (multibit or parity) indications are detected during memory read and can be reported to

software by the ITGR software interrupt. For information about how to enable the this interrupt, see

Interrupt Controller, page 364.

The memory integrity monitor operates in three different states: IDLE, LISTEN, and DETECT. After a

reset, the monitor starts in the IDLE state.

IDLE The monitor is deactivated and in quiet mode. In IDLE mode, the memories still correct, detect,

and store indications locally, but they are not able to report indications to the monitor.

LISTEN In the LISTEN state, the monitor looks for indications in the memories.

MEMITGR_STAT.INDICATION is set (and interrupt is asserted) when indications are detected.

DETECT DETECT state is used when indications are read from the memories. It means that a valid

indication is available in MEMITGR_INFO and the corresponding memory index in MEMITGR_IDX.

The current state of the monitor is reported in MEMITGR_STAT.MODE_IDLE,

MEMITGR_STAT.MODE_DETECT, and MEMITGR_STAT.MODE_LISTEN. Software initiates transitions

between states by setting the one-shot MEMITGR_CTRL.ACTIVATE field. It may take some time to

transition from one state to the next. The MEMITGR_CTR.ACTIVATE field is not cleared before the next

state is reached (also the MEMITGR_STAT.MODE_BUSY field is set while transitioning between states).

Table 269 •

Integrity Monitor Registers

Description

DEVCPU_GCB::MEMITGR_CTRL

Trigger monitor state changes.

DEVCPU_GCB::MEMITGR_STAT

Current state of the monitor and memory status.

DEVCPU_GCB::MEMITGR_INFO

Shows indication when in DETECT state.

DEVCPU_GCB::MEMITGR_IDX

Shows memory index when in DETECT state.

DEVCPU_GCB::MEMITGR_DIV

Monitor speed.

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