ELM
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7.4.3 Functional Description
The ELM is designed around the error-location engine, which handles the computation based on the input
syndrome polynomials.
The ELM maps the error-location engine to a standard interconnect interface by using a set of registers to
control inputs and outputs.
7.4.3.1 ELM Software Reset
To perform a software reset, write a 1 to the ELM_SYSCONFIG[1] SOFTRESET bit. The
ELM_SYSSTATUS[0] RESETDONE bit indicates that the software reset is complete when its value is 1.
When the software reset completes, the ELM_SYSCONFIG[1] SOFTRESET bit is automatically reset.
7.4.3.2 ELM Power Management
Table 7-165 describes the power-management features available to the ELM module.
Table 7-165. Local Power Management Features
Feature Registers Description
Clock autogating ELM_SYSCONFIG[0] This bit allows a local power optimization inside the module by
AUTOGATING bit gating the ELM_FCLK clock upon the interface activity.
Slave idle modes ELM_SYSCONFIG[4:3] Force-idle, No-idle, and Smart-idle modes are available.
SIDLEMODE bit field
Clock activity ELM_SYSCONFIG[8] The clock can be switched-off or maintained during the wake-up
CLOCKACTIVITY bit period.
Master Standby modes N/A
Global Wake-up Enable N/A
Wake-up Sources Enable N/A
CAUTION
The PRCM module has no hardware means of reading CLOCKACTIVITY
settings. Thus, software must ensure consistent programming between the
ELM CLOCKACTIVITY and ELM clock PRCM control bits.
7.4.3.3 ELM Interrupt Requests
Table 7-166 lists the event flags, and their masks, that can cause module interrupts.
Table 7-166. Events
Event Flag Event Mask Map to Description
ELM_IRQSTATUS[8] ELM_IRQENABLE[8] ELM_IRQ Page interrupt
PAGE_VALID PAGE_MASK
ELM_IRQSTATUS[7] ELM_IRQENABLE[7] ELM_IRQ Error-location interrupt for syndrome polynomial 7
LOC_VALID_7 LOCATION_MASK_7
ELM_IRQSTATUS[6] ELM_IRQENABLE[6] ELM_IRQ Error-location interrupt for syndrome polynomial 6
LOC_VALID_6 LOCATION_MASK_6
ELM_IRQSTATUS[5] ELM_IRQENABLE[5] ELM_IRQ Error-location interrupt for syndrome polynomial 5
LOC_VALID_5 LOCATION_MASK_5
ELM_IRQSTATUS[4] ELM_IRQENABLE[4] ELM_IRQ Error-location interrupt for syndrome polynomial 4
LOC_VALID_4 LOCATION_MASK_4
ELM_IRQSTATUS[3] ELM_IRQENABLE[3] ELM_IRQ Error-location interrupt for syndrome polynomial 3
LOC_VALID_3 LOCATION_MASK_3
ELM_IRQSTATUS[2] ELM_IRQENABLE[2] ELM_IRQ Error-location interrupt for syndrome polynomial 2
LOC_VALID_2 LOCATION_MASK_2
478
Memory Subsystem SPRUH73H–October 2011–Revised April 2013
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