DSP56303 datasheet(7/108 Pages) FREESCALE

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Power

DSP56303 Technical Data, Rev. 11

Freescale Semiconductor

1-3

1.1 Power

1.2 Ground

Table 1-2.

Power Inputs

Power Name

Description

VCCP

PLL Power—VCC dedicated for PLL use. The voltage should be well-regulated and the input should be provided with

an extremely low impedance path to the VCC power rail.

VCCQ

Quiet Power—An isolated power for the core processing logic. This input must be isolated externally from all other chip

power inputs.

VCCA

Address Bus Power—An isolated power for sections of the address bus I/O drivers. This input must be tied externally

to all other chip power inputs,

except VCCQ.

VCCD

Data Bus Power—An isolated power for sections of the data bus I/O drivers. This input must be tied externally to all

other chip power inputs,

except VCCQ.

VCCC

Bus Control Power—An isolated power for the bus control I/O drivers. This input must be tied externally to all other

chip power inputs,

except VCCQ.

VCCH

Host Power—An isolated power for the HI08 I/O drivers. This input must be tied externally to all other chip power

inputs,

except VCCQ.

VCCS

ESSI, SCI, and Timer Power—An isolated power for the ESSI, SCI, and timer I/O drivers. This input must be tied

externally to all other chip power inputs,

except VCCQ.

Note: The user must provide adequate external decoupling capacitors for all power connections.

Table 1-3.

Grounds1

Ground Name

Description

GNDP

PLL Ground—Ground-dedicated for PLL use. The connection should be provided with an extremely low-impedance

path to ground. VCCP should be bypassed to GNDP by a 0.47 µF capacitor located as close as possible to the chip

package.

GNDP1

PLL Ground 1—Ground-dedicated for PLL use. The connection should be provided with an extremely low-impedance

path to ground.

GNDQ

Quiet Ground—An isolated ground for the internal processing logic. This connection must be tied externally to all other

chip ground connections, except GNDP and GNDP1. The user must provide adequate external decoupling capacitors.

GNDA

Address Bus Ground—An isolated ground for sections of the address bus I/O drivers. This connection must be tied

externally to all other chip ground connections, except GNDP and GNDP1. The user must provide adequate external

decoupling capacitors.

GNDD

Data Bus Ground—An isolated ground for sections of the data bus I/O drivers. This connection must be tied externally

to all other chip ground connections, except GNDP and GNDP1. The user must provide adequate external decoupling

capacitors.

GNDC

Bus Control Ground—An isolated ground for the bus control I/O drivers. This connection must be tied externally to all

other chip ground connections, except GNDP and GNDP1. The user must provide adequate external decoupling

capacitors.

GNDH

Host Ground—An isolated ground for the HI08 I/O drivers. This connection must be tied externally to all other chip

ground connections, except GNDP and GNDP1. The user must provide adequate external decoupling capacitors.

GNDS

ESSI, SCI, and Timer Ground—An isolated ground for the ESSI, SCI, and timer I/O drivers. This connection must be

tied externally to all other chip ground connections, except GNDP and GNDP1. The user must provide adequate external

decoupling capacitors.

GND3

Ground—Connected to an internal device ground plane.

Notes:

The user must provide adequate external decoupling capacitors for all GND connections.

These connections are only used on the TQFP package.

These connections are common grounds used on the MAP-BGA package.

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