AM652X datasheet(262/299 Pages) TI1

262 / 299 page

262

AM6548, AM6528, AM6546

AM6526, AM6527

SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018

www.ti.com

Submit Documentation Feedback

Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Detailed Description

•

Dedicated 16-bit time-base counter with period and frequency control

•

Two PWM outputs (EPWMxA and EPWMxB) that can be used in the following configurations:

–

Two independent PWM outputs with single-edge operation

–

Two independent PWM outputs with dual-edge symmetric operation

–

One independent PWM output with dual-edge asymmetric operation

•

Asynchronous override control of PWM signals through software

•

Programmable phase-control support for lag or lead operation relative to other EPWM modules

•

Hardware-locked (synchronized) phase relationship on a cycle-by-cycle basis

•

Dead-band generation with independent rising and falling edge delay control

•

Programmable trip zone allocation of both cycle-by-cycle trip and one-shot trip on fault conditions

•

A trip condition can force either high, low, or high-impedance state logic levels at PWM outputs

•

Allows events to trigger both CPU interrupts and ADC start of conversions

•

Programmable event prescaling minimizes CPU overhead on interrupts

•

PWM chopping by high-frequency carrier signal, useful for pulse transformer gate drives

•

High-resolution module with programmable delay line

–

Programmable on a per PWM period basis

–

Can be inserted either on the rising edge or falling edge of the PWM pulse or both or not at all.

EHRPWM Not Supported Features:

•

EPWM digital comparator modules are not supported

For more information, see section Enhanced High Resolution Pulse Width Modulation (EHRPWM) Module

in chapter Peripherals of the device TRM.

6.11.9 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.

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.

The maximum acceptable number of errors that can be corrected depends on a programmable

configuration parameter. 4-, 8-, and 16-bit error-correction levels are supported. The ELM depends on a

static and fixed definition of the generator polynomial for each error-correction level that corresponds to

the generator polynomials defined in the GPMC (there are three fixed polynomial for the three correction

error levels). A larger number of errors than the programmed error-correction level may be detected, but

the ELM cannot correct them all. The offending block is then tagged as uncorrectable in the associated

computation exit status register. If the computation is successful, that is, if the number of errors detected

does not exceed the maximum value authorized for the chosen correction capability, the exit status

AM652X Folha de dados(PDF) 262 Page - Texas Instruments

AM652X Folha de dados(HTML) 262 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Folha de dados Download

Ligação URL