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• Speed measurements of rotating machinery (for example, toothed sprockets sensed via Hall sensors)

• Elapsed time measurements between position sensor pulses

• Period and duty cycle measurements of pulse train signals

• Decoding current or voltage amplitude derived from duty cycle encoded current/voltage sensors.

For more information, see Enhanced Capture (ECAP) Module section in the device TRM.

8.4.5.8 EPWM

An effective PWM peripheral must be able to generate complex pulse width waveforms with minimal CPU

overhead or intervention. It needs to be highly programmable and very flexible while being easy to understand

and use. The EPWM unit described here addresses these requirements by allocating all needed timing and

control resources on a per PWM channel basis. Cross coupling or sharing of resources has been avoided;

instead, the EPWM is built up from smaller single channel modules with separate resources and that can

operate together as required to form a system. This modular approach results in an orthogonal architecture and

provides a more transparent view of the peripheral structure, helping users to understand its operation quickly.

For more information, see Enhanced Pulse Width Modulation (EPWM) Module section in the device TRM.

8.4.5.9 ELM

The ELM is used with the GPMC. Syndrome polynomials generated on-the-fly when reading a NAND flash page

and stored in GPMC registers are passed to the ELM. A host processor can then correct the data block by

flipping the bits to which the ELM error-location outputs point.

When reading from NAND flash memories, some level of error-correction is required. In the case of NAND

modules with no internal correction capability, sometimes referred to as bare NANDs, the correction process is

delegated to the memory controller. ELM can be also used to support parallel NOR flash or NAND flash.

The General-Purpose Memory Controller (GPMC) probes data read from an external NAND flash and uses

this to compute checksum-like information, called syndrome polynomials, on a per-block basis. Each syndrome

polynomial gives a status of the read operations for a full block, including 512 bytes of data, parity bits,

and an optional spare-area data field, with a maximum block size of 1023 bytes. Computation is based on

a Bose-Chaudhuri-Hocquenghem (BCH) algorithm. The ELM extracts error addresses from these syndrome

polynomials.

Based on the syndrome polynomial value, the ELM can detect errors, compute the number of errors, and give

the location of each error bit. The actual data is not required to complete the error-correction algorithm. Errors

can be reported anywhere in the NAND flash block, including in the parity bits.

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

8.4.5.10 ESM

The Error Signaling Module (ESM) aggregates safety-related events and 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 pin 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 safe, known state.

For more information, see Error Signaling Module (ESM) section in the device TRM.

8.4.5.11 EQEP

The Enhanced 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.

For more information, see Enhanced Quadrature Encoder Pulse (EQEP) Module section in the device TRM.

8.4.5.12 GPIO

The General-Purpose Input/Output (GPIO) peripheral provides dedicated general-purpose pins that can be

configured as either inputs or outputs. When configured as an output, the user can write to an internal register to

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AM6548, AM6528, AM6546, AM6526

SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021

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