DSP56857 datasheet(79/662 Pages) FREESCALE

79 / 662 page

Power, Ground and Peripheral Signals

Overview, Rev. 4

Freescale Semiconductor

2-11

Table 2-3. Grounds

Signal Name

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

VSS

Ground—These pins provide grounding for the internal structures of

the chip and should all be attached to VSS.

VSSIO

Ground—These pins provide grounding for all I/O and ESD structures

of the chip. They all should be attached to VSSIO.

VSSA

Analog Power—These pins supply an analog ground.

Table 2-4. External Bus Control Signals

Signal Name

Signal Type

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

A0-A20

Output(Z)

Address Bus—These signals specify a word

address for external program or data memory

access.

—

D0-D15

Input / Output(Z)

Data Bus—These pins provide the bidirectional

data for external program or data memory

accesses.

—

Output

Read Enable—is asserted during external

memory read cycles. This signal is pulled high

during reset.

—

Output

Write Enable—is asserted during external

memory write cycles. This signal is pulled high

during reset.

—

Table 2-5.

External Chip Select

Signal Name

Signal Type

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

CSO- CS3

(GPIOA0-A3)

Output

Input / Output

External Chip Select—These pins are used as

chip selects during external memory cycles.

Port A GPIO0-3—These are General Purpose I/O

pins when not configured for EMI use.

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