DSP56600FMSLASHAD datasheet(42/76 Pages) NXP

42 / 76 page

Preliminary

1-36

DSP56651 Technical Data Sheet

MOTOROLA

Pin and Signal Descriptions

DSP56651 Signal Description

JTAG Port

When the bottom connector pins are selected as a debug port by holding the

MUX_CTL pin at a logic high, the dedicated JTAG pins become inactive. That is, they

are disconnected from the JTAG TAP controller. For JTAG signals equipped with

resistors, all pull-ups and pull-downs are automatically disconnected when the pin is

an output.

Table 1-22

JTAG Port Signals

Signal Name

Signal

Type

State

during

Reset

Signal Description

TMS

Input

Test mode select

—TMS is an input signal used to sequence the test

controller’s state machine. TMS is sampled on the rising edge of

TCK and has an internal 47 k

Ω pull-up resistor.

MUX_CTL high

: INT7 is connected to the JTAG TAP controller and

functions as TMS, see Table 1-12 on page 1-19.)

TDI

Input

Test data input

—TDI is a serial test data input signal used for test

instructions and data. TDI is sampled on the rising edge of TCK and

has an internal 47 k

Ω pull-up resistor.

MUX_CTL high

: RxD is connected to the JTAG TAP controller and

functions as TDI, see Table 1-15 on page 1-26.)

TDO

Output

Tri-

stated

Test data output

—TDO is a test data serial output signal used for

test instructions and data. TDO is tri-statable and is actively driven

in the shift-IR and shift-DR controller states. TDO changes on the

falling edge of TCK.

MUX_CTL high

: TxD is connected to the JTAG TAP controller and

functions as TDO, see Table 1-15 on page 1-26.)

TCK

Input

Test clock

—TCK is a test clock input signal used to synchronize the

JTAG test logic. It has an internal 47 k

Ω pull-up resistor.

MUX_CTL high

: ROW7 is connected to the JTAG TAP controller

and functions as TCK, see Table 1-14 on page 1-22.)

TRST

Input

Test reset

—TRST is an active-low Schmitt-trigger input signal used

to asynchronously initialize the test controller. TRST has an internal

47 k

Ω pull-up resistor.

MUX_CTL high

: INT6 is connected to the JTAG TAP controller and

functions as TRST, see Table 1-12 on page 1-19.)

TEST

Input

Factory test mode

—Selects factory test mode. Reserved. This pin

MUST be connected to ground.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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