DSP56KFAMUM/AD(1996) View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56KFAMUM/AD
(Rev.:1996)

24-BIT DIGITAL SIGNAL PROCESSOR

Motorola => Freescale 

Signal/Pin Descriptions

On-Chip Emulation Port

On-CHIP EMULATION PORT

Table 1-13 On-Chip Emulation (OnCE) Signals

Signal Name

Signal

Type

State

during

Reset

Signal Description

DSI/OS0

Input

or

Output

Low

Output

Debug Serial Input/Chip Status 0—Serial data or commands

are provided to the OnCE controller through the DSI/OS0 signal

when it is an input. The data received on the DSI signal will be

recognized only when the DSP has entered the Debug mode of

operation. Data is latched on the falling edge of the DSCK serial

clock. Data is always shifted into the OnCE serial port Most

Significant Bit (MSB) first. When the DSI/OS0 signal is an

output, it works in conjunction with the OS1 signal to provide

chip status information. The DSI/OS0 signal is an output when

the processor is not in Debug mode. When switching from

output to input, the signal is tri-stated.

DSCK/OS1

Note: Connect an external pull-down resistor to this signal.

Input

or

Output

Low

Output

Debug Serial Clock/Chip Status 1—The DSCK/OS1 signal

supplies the serial clock to the OnCE when it is an input. The

serial clock provides pulses required to shift data into and out of

the OnCE serial port. (Data is clocked into the OnCE on the

falling edge and is clocked out of the OnCE serial port on the

rising edge.) The debug serial clock frequency must be no

greater than 1/8 of the processor clock frequency. When

switching from input to output, the signal is tri-stated.

When it is an output, this signal works with the OS0 signal to

provide information about the chip status. The DSCK/OS1 signal

is an output when the chip is not in Debug mode.

Note: Connect an external pull-down resistor to this signal.

1-18

DSP56002/D, Rev. 3

MOTOROLA

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