VSC7440 datasheet(380/444 Pages) MICROSEMI

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VCore-III System and CPU Interfaces

VMDS-10492 VSC7440 Datasheet Revision 4.2

363

Figure 128 •

Monitor State Diagram

The first time after reset that MEMITGR_CTRL.ACTIVATE is set, the monitor resets the detection logic in

all the memories and transitions directly from IDLE to LISTEN state.

Before setting MEMITGR_CTRl.ACTIVATE for the first time, speed up the monitor by setting

MEMITGR_DIV.MEM_DIV to the value specified in the registers list. The memories of the PCIe MAC are

clock-gated and bypassed when PCIe interface is not enabled; enable monitoring of PCIe MAC

memories by setting ICPU_CFG::PCIE_CFG.MEM_RING_CORE_ENA. This field must not be set when

PCIe interface is not enabled.

To read out indications, first transition from LISTEN to IDLE, then continue transitioning until the LISTEN

state is reached. Every time the monitor ends up in the DETECT state, an indication is available in the

MEMITGR_INFO and MEMITGR_IDX registers. Each memory stores one indication. Indications are

cleared when they are read by way of the monitor. Each indication contains four flags and one memory

address.

•

The MEM_ERR flag is set when a non-correctable upset is detected and the corresponding address

is available in MEM_ADDR.

•

The MEM_ERR_OVF flag is set when a non-correctable upset is detected for which address could

not be stored.

•

The MEM_COR flag is set when a correctable upset is detected and the corresponding address is

available in MEM_ADDR.

•

The MEM_COR_OVF flag is set when a correctable upset is detected for which address could not

be stored.

Information about non-correctable upsets is prioritized over correctable upsets. Address can only be

saved when the monitor is in LISTEN mode. The following flowchart shows how the detection logic sets

flags and address.

IDLE

LISTEN

DETECT

At least one valid indication

in the memories.

Transitions in this diagram are triggered by

setting MEMITGR_CTRL.ACTIVATE (can only

be set when non-BUSY.)

No more indications in

the memories

No more indications in

the memories

At least one (more) valid

indication in the memories

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