AM652X datasheet(263/299 Pages) TI1

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263

AM6548, AM6528, AM6546

AM6526, AM6527

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SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018

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Detailed Description

When the error-location process completes, an interrupt is triggered to inform the software that its status

can be checked. The number of detected errors and their locations in the NAND block can be retrieved

from the module through register accesses.

The ELM has the following features:

•

4, 8, and 16 bits per 512-byte block error-location, based on BCH algorithms

•

Eight simultaneous processing contexts

•

Page-based and continuous modes

•

Interrupt generation on error-location process completion:

–

When the full page has been processed in page mode

–

For each syndrome polynomial in continuous mode.

For more information, see section Error Location Module (ELM) in chapter Peripherals of the device TRM.

6.11.10 ESM

The Error Signaling Module (ESM) aggregates safety-related events and/or errors from throughout the

device into one location. It can signal both low and high priority interrupts to a processor to deal with a

safety event and/or manipulate an I/O error pad to signal an external hardware that an error has occurred.

Therefore an external controller is able to reset the device or keep the system in a fail-safe state.

The device has three instances of ESM modules.

Each ESM module implements the following features:

•

Up to 1024 error event inputs

–

Implemented in groups of 32 events

–

Level or Pulse inputs (Pulse inputs are triple redundant)

•

Selectable low and high priority interrupt error pad prioritization of each error event

•

Error pad to signal severe device failure

•

Configurable timebase for error signal

•

Error forcing capability

•

Internal redundant flops on safety critical fields

For more information, see section Error Signaling Module (ESM) in chapter Peripherals of the device

TRM.

6.11.11 eQEP

The Enhnanced Quadrature Encoder Pulse (EQEP) peripheral is used for direct interface with a linear or

rotary incremental encoder to get position, direction and speed information from a rotating machine for use

in high performance motion and position control system. The disk of an incremental encoder is patterned

with a single track of slots patterns. These slots create an alternating pattern of dark and light lines. The

disk count is defined as the number of dark/light line pairs that occur per revolution (lines per revolution).

As a rule, a second track is added to generate a signal that occurs once per revolution (index signal:

QEPI), which can be used to indicate an absolute position. Encoder manufacturers identify the index pulse

using different terms such as index, marker, home position and zero reference.

To derive direction information, the lines on the disk are read out by two different photo-elements that

"look" at the disk pattern with a mechanical shift of 1/4 the pitch of a line pair between them. This shift is

realized with a reticle or mask that restricts the view of the photo-element to the desired part of the disk

lines. As the disk rotates, the two photo-elements generate signals that are shifted 90 degrees out of

phase from each other. These are commonly called the quadrature QEPA and QEPB signals. The

clockwise direction for most encoders is defined as the QEPA channel going positive before the QEPB

channel and vise versa.

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