C6416 datasheet(73/134 Pages) TI1

73 / 134 page

SMJ320C6414, SMJ320C6415, SMJ320C6416

FIXEDPOINT DIGITAL SIGNAL PROCESSORS

SGUS050A − JANUARY 2004 − REVISED MARCH 2004

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

C64x power-down mode with an emulator

If user power-down modes are programmed, and an emulator is attached, the modes will be masked to allow

the emulator access to the system. This condition prevails until the emulator is reset or the cable is removed

from the header. If power measurements are to be performed when in a power-down mode, the emulator cable

should be removed.

When the DSP is in power-down mode PD2 or PD3, emulation logic will force any emulation execution

command (such as Step or Run) to spin in IDLE. For this reason, PC writes (such as loading code) will fail. A DSP

reset will be required to get the DSP out of PD2/PD3.

power-supply sequencing

TI DSPs do not require specific power sequencing between the core supply and the I/O supply. However,

systems should be designed to ensure that neither supply is powered up for extended periods of time

(

>1 second) if the other supply is below the proper operating voltage.

power-supply design considerations

A dual-power supply with simultaneous sequencing can be used to eliminate the delay between core and I/O

power up. A Schottky diode can also be used to tie the core rail to the I/O rail (see Figure 10).

DVDD

CVDD

VSS

C6000

DSP

Schottky

Diode

I/O Supply

Core Supply

GND

Figure 10. Schottky Diode Diagram

Core and I/O supply voltage regulators should be located close to the DSP (or DSP array) to minimize

inductance and resistance in the power delivery path. Additionally, when designing for high-performance

applications utilizing the C6000

 platform of DSPs, the PC board should include separate power planes for

core, I/O, and ground, all bypassed with high-quality low-ESL/ESR capacitors.

power-supply decoupling

In order to properly decouple the supply planes from system noise, place as many capacitors (caps) as possible

close to the DSP. Assuming 0603 caps, the user should be able to fit a total of 60 caps, 30 for the core supply

and 30 for the I/O supply. These caps need to be close to the DSP, no more than 1.25 cm maximum distance

to be effective. Physically smaller caps are better, such as 0402, but need to be evaluated from a

yield/manufacturing point-of-view. Parasitic inductance limits the effectiveness of the decoupling capacitors,

therefore physically smaller capacitors should be used while maintaining the largest available capacitance

value. As with the selection of any component, verification of capacitor availability over the product’s production

lifetime should be considered.

C6416 Datasheet(PDF) 73 Page - Texas Instruments

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