DSP56004SLASHD datasheet(17/82 Pages) FREESCALE

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Signal/Connection Descriptions

Serial Host Interface (SHI)

MOTOROLA

DSP56004/D, Rev. 3

1-11

MISO

SDA

Input or

Output

Input or

Output

Tri-stated

SPI Master-In-Slave-Out (MISO)

—When the SPI is

configured as a master, MISO is the master data input

line. The MISO signal is used in conjunction with the

MOSI signal for transmitting and receiving serial data.

This signal is a Schmitt-trigger input when configured

for the SPI Master mode, an output when configured for

the SPI Slave mode, and tri-stated if configured for the

SPI Slave mode when SS is deasserted.

I2C Serial Data and Acknowledge (SDA)

—In I2C mode,

SDA is a Schmitt-trigger input when receiving and an

open-drain output when transmitting. SDA should be

connected to VCC through a pull-up resistor. SDA carries

the data for I2C transactions. The data in SDA must be

stable during the high period of SCL. The data in SDA is

only allowed to change when SCL is low. When the bus

is free, SDA is high. The SDA line is only allowed to

change during the time SCL is high in the case of Start

and Stop events. A high-to-low transition of the SDA line

while SCL is high is an unique situation, and is defined

as the Start event. A low-to-high transition of SDA while

SCL is high is an unique situation, and is defined as the

Stop event.

Note:

This line is tri-stated during hardware reset, software

reset, or individual reset (no need for external pull-up

in this state).

MOSI

HA0

Input or

Output

Input

Tri-stated

SPI Master-Out-Slave-In (MOSI)

—When the SPI is

configured as a master, MOSI is the master data output

line. The MOSI signal is used in conjunction with the

MISO signal for transmitting and receiving serial data.

MOSI is the slave data input line when the SPI is

configured as a slave. This signal is a Schmitt-trigger

input when configured for the SPI Slave mode.

I2C Slave Address 0 (HA0)—

This signal uses a Schmitt-

trigger input when configured for the I2C mode. When

configured for I2C Slave mode, the HA0 signal is used to

form the slave device address. HA0 is ignored when the

SHI is configured for the I2C Master mode.

Note:

This signal is tri-stated during hardware reset,

software reset, or individual reset (no need for

external pull-up in this state).

Table 1-8

Serial Host Interface (SHI) signals (Continued)

Signal Name

Signal

Type

State

during

Reset

Signal Description

Freescale Semiconductor, Inc.

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DSP56004/D Datasheet(PDF) 17 Page - Freescale Semiconductor, Inc

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