ENICSF2811PBKA datasheet(160/172 Pages) TI1

160 / 172 page

TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

SPRS174T – APRIL 2001 – REVISED MAY 2012

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6.34 Migrating From F281x Devices to C281x Devices

The migration issues to be considered while migrating from the F281x devices to C281x devices are as

follows:

•

The 1K OTP memory available in F281x devices has been replaced by 1K ROM in C281x devices.

•

Power sequencing is not needed for C281x devices. In other words, 3.3-V and 1.8-V (or 1.9-V) can

ramp together. C281x can also be used on boards that have F281x power sequencing implemented;

however, if the 1.8-V (or 1.9-V) rail lags the 3.3-V rail, the GPIO pins are undefined until the 1.8-V rail

reaches at least 1 V.

•

Current consumption differs for F281x and C281x devices for all four possible modes. See the

appropriate electrical section for exact numbers.

•

The VDD3VFL pin is the 3.3-V flash core power pin in F281x devices but is a VDDIO pin in C281x devices.

•

F281x and C281x devices are pin-compatible and code-compatible; however, they are electrically

different with different EMI/ESD profiles. Before ramping production with C281x devices, evaluate

performance of the hardware design with both devices.

•

Addresses 0x3D 7BFC through 0x3D 7BFF in the OTP and addresses 0x3F 7FF2 through 0x3F 7FF5

in the main ROM array are reserved for ROM part-specific information and are not available for user

applications.

•

The ADC module in C281x devices can operate at 24.9k bias on ADCRESEXT pin for the full range

1–25 MHz. While migrating the F281x designs to C281x, use a 24.9k resistor for biasing the ADC.

•

The paged and random wait-state specifications for the flash and ROM parts are different. While

migrating from flash to ROM parts, the same wait-state values must be used for best performance

compatibility (for example, in applications that use software delay loops or where precise interrupt

latencies are critical).

•

The PART-ID register value is different for Flash and ROM parts.

For errata applicable to 281x devices, see the TMS320F2810, TMS320F2811, TMS320F2812,

TMS320C2810, TMS320C2811, TMS320C2812 DSP Silicon Errata (literature number SPRZ193).

160

Electrical Specifications

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