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5.6

Reset

5.6.1

Reset Electrical Data/Timing

TMS320DM643

Video/Imaging Fixed-Point Digital Signal Processor

SPRS269A – FEBRUARY 2005 – REVISED APRIL 2005

A hardware reset (RESET) is required to place the DSP into a known good state out of power-up. The

RESET signal can be asserted (pulled low) prior to ramping the core and I/O voltages or after the core

and I/O voltages have reached their proper operating conditions. As a best practice, reset should be held

low during power-up. Prior to deasserting RESET (low-to-high transition), the core and I/O voltages should

be at their proper operating conditions and CLKIN should also be running at the correct frequency.

For information on peripheral selection at the rising edge of RESET, see the Device Configuration section

of this data manual.

Table 5-10. Timing Requirements for Reset (see Figure 5-9)

–500

–600

NO.

UNIT

MIN

MAX

tw(RST)

Width of the RESET pulse

250

µs

tsu(boot)

Setup time, boot configuration bits valid before RESET high (1)

4E or 4C(2)

th(boot)

Hold time, boot configuration bits valid after RESET high (1)

4P(3)

(1)

AEA[22:19], LENDIAN, and HD5 are the boot configuration pins during device reset.

(2)

E = 1/AECLKIN clock frequency in ns. C = 1/CLKIN clock frequency in ns.

Select the MIN parameter value, whichever value is larger.

(3)

P = 1/CPU clock frequency in ns. For example, when running parts at 600 MHz, use P = 1.67 ns.

DM643 Peripheral Information and Electrical Specifications

TMS320DM643 Scheda tecnica(PDF) 76 Page - Texas Instruments