APR15SLASHD datasheet(17/101 Pages) NXP

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DSP56001A

Synchronous Serial Interface Port

MOTOROLA

DSP56001A/D, Rev. 1

1-11

SYNCHRONOUS SERIAL INTERFACE PORT

Table 1-11

Synchronous Serial Interface (SSI) Signals

Signal Name

Signal

Type

State

during

Reset

Signal Description

SC0

PC3

Input or

Output

Input or

Output

Tri-stated Serial Clock 0 (SC0)—This signal’s function is determined by

whether the SCLK is in Synchronous or Asynchronous mode.

•

In Synchronous mode, this signal is used as a serial I/O flag.

•

In Asynchronous mode, this signal receives clock I/O.

Port C GPIO 3 (PC3)

—This signal is GPIO signal PC3 when not

configured as SCI signal SC0.

After reset, the default state is GPIO input.

SC1

PC4

Input or

Output

Input or

Output

Tri-stated Serial Clock 1 (SC1)—The SSI uses this bidirectional signal to

control flag or frame synchronization. This signal’s function is

determined by whether the SCLK is in Synchronous or

Asynchronous mode.

•

In Asynchronous mode, this signal is frame sync I/O.

•

For Synchronous mode with continuous clock, this signal is

a serial I/O flag and operates like the SC0.

SC0 and SC1 are independent serial I/O flags, but may be used

together for multiple serial device selection.

Port C GPIO 4 (PC4)

—This signal is GPIO signal PC4 when not

configured as SSI function SC1.

After reset, the default state is GPIO input.

SC2

PC5

Input or

Output

Input or

Output

Tri-stated Serial Clock 2 (SC2)—The SSI uses this bidirectional signal to

control frame synchronization only. As with SC0 and SC1, its

function is defined by the SSI operating mode.

Port C GPIO 5 (PC5)

—This signal is GPIO signal PC5 when not

configured as SSI function SC1.

After reset, the default state is GPIO input.

SCK

PC6

Input or

Output

Input or

Output

Tri-stated SSI Serial Receive Clock—This bidirectional signal provides the

serial bit rate clock for the SSI when only one clock is being used.

Port C GPIO 6 (PC6)

—This signal is GPIO signal PC6 when the SSI

function is not being used.

After reset, the default state is GPIO input.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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