TMS320LC2401AVFS datasheet(65/88 Pages) TI

65 / 88 page

TMS320LF2401A, TMS320LC2401A

DSP CONTROLLERS

SPRS161K − MARCH 2001 − REVISED JULY 2007

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

RS timing

timing requirements for a reset [H = 0.5tc(CO)] (see Figure 27 and Figure 28)

MIN

NOM

MAX

UNIT

tw(RSL)

Pulse duration, stable CLKIN to RS high

8tc(CI)†

cycles

tw(RSL2)

Pulse duration, RS low

8tc(CI)

cycles

PLL lock-up time

98304tc(CI)

cycles

td(EX)

Delay time, reset vector executed after PLL lock time

36H

cycles

† During power-on reset, the device can continue to hold the RS pin low for another 128 CLKIN cycles.

XTAL1

(See

Note B)

tw(RSL)

td(EX)

VDD/VDDO

CLKIN

TDI

(See

Note D)

tOSCST

(See Note C)

I/Os

TDI/OPB5

Code-Dependent

CLKOUT

(See

Note E)

BOOT_EN

Hi-Z

NOTES: A. Be certain that the emulation logic is reset before de-asserting the device reset. That is, TRST of the device is not driven high before

the device reset is de-asserted. This is applicable to XDS510

, XDS510PP, and XDS510PP+ class of emulators. New

generation emulators such as SPI515

 and XDS510 USB emulators have a built-in protection mechanism to take care of this

requirement.

B. XTAL1 refers to the internal oscillator clock if an on-chip oscillator is used.

C. tOSCST is the oscillator start-up time, which is dependent on crystal/resonator and board design.

D. The TDI pin is used to determine whether or not the on-chip boot ROM is invoked in the BOOT_EN phase. In the “TDI/OPB5” phase,

this pin functions as TDI (if TRST is high) or OPB5 (if TRST is low).

E. Unlike other 24x/240x devices, the CLKOUT signal does not appear on the CLKOUT pin by default (after a device reset). The

CLKOUT waveform depicted in the figure is present internally in the DSP. However, in order to route the internal CLKOUT signal

to the XINT2/ADCSOC/CAP1/IOPA7/CLKOUT pin, bit 7 of the MCRA register must be programmed appropriately.

Figure 27. Power-On Reset

XDS510PP+, SP515, and XDS510 USB are trademarks of Spectrum Digital.

XDS510 and XDS510PP, are trademarks of Texas Instruments.

TMS320LC2401AVFS Datasheet(PDF) 65 Page - Texas Instruments

TMS320LC2401AVFS Datasheet(HTML) 65 Page - Texas Instruments

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