TMS320DM647 datasheet(101/182 Pages) TI

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6.9.3.6 Bulk Bypass Capacitors

TMS320DM647/TMS320DM648

Digital Media Processor

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SPRS372B – MAY 2007 – REVISED APRIL 2008

Bulk bypass capacitors are required for moderate speed bypassing of the DDR2 and other circuitry.

Table 6-32 contains the minimum numbers and capacitance required for the bulk bypass capacitors. This

table covers only the bypass needs of the DSP and DDR2 interfaces. Additional bulk bypass capacitance

may be needed for other circuitry.

Table 6-32. Bulk Bypass Capacitors

NO.

PARAMETER

MIN

MAX

UNIT

DVDD18 Bulk Bypass Capacitor Count

(1)

Devices

DVDD18 Bulk Bypass Total Capacitance

µF

DDR#1 Bulk Bypass Capacitor Count(1)

Devices

DDR#1 Bulk Bypass Total Capacitance

µF

DDR#2 Bulk Bypass Capacitor Count(1)(2)

Devices

DDR#2 Bulk Bypass Total Capacitance(2)

µF

(1)

These devices should be placed near the device they are bypassing, but preference should be given to the placement of the high-speed

(HS) bypass caps.

(2)

Only used on 32-bit wide DDR2 memory systems

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