TMS320VC5407 datasheet(22/110 Pages) TI

22 / 110 page

Introduction

November 2001 − Revised April 2004

SPRS007D

Table 2−2. Signal Descriptions (Continued)

TERMINAL

NAME

DESCRIPTION

I/O†

SUPPLY PINS

CVDD

+VDD. Dedicated 1.5V power supply for the core CPU.

DVDD

+VDD. Dedicated 3.3V power supply for I/O pins.

VSS

Ground.

TCK

IEEE standard 1149.1 test clock. TCK is normally a free-running clock signal with a 50% duty cycle. The

changes on test access port (TAP) of input signals TMS and TDI are clocked into the TAP controller, instruction

on the falling edge of TCK.

TDI

IEEE standard 1149.1 test data input, pin with internal pullup device. TDI is clocked into the selected register

(instruction or data) on a rising edge of TCK.

TDO

O/Z

IEEE standard 1149.1 test data output. The contents of the selected register (instruction or data) are shifted

out of TDO on the falling edge of TCK. TDO is in the high-impedance state except when scanning of data is

in progress. TDO also goes into the high-impedance state when OFF is low.

TMS

IEEE standard 1149.1 test mode select. Pin with internal pullup device. This serial control input is clocked into

the test access port (TAP) controller on the rising edge of TCK.

TRST

IEEE standard 1149.1 test reset. TRST, when high, gives the IEEE standard 1149.1 scan system control of

the operations of the device. If TRST is not connected or driven low, the device operates in its functional

mode, and the IEEE standard 1149.1 signals are ignored. Pin with internal pulldown device.

EMU0

I/O/Z

Emulator 0 pin. When TRST is driven low, EMU0 must be high for activation of the OFF condition. When TRST

is driven high, EMU0 is used as an interrupt to or from the emulator system and is defined as input/output by

way of IEEE standard 1149.1 scan system. Should be pulled up to DVDD with a separate 4.7-kΩ resistor.

EMU1/OFF

I/O/Z

Emulator 1 pin/disable all outputs. When TRST is driven high, EMU1/OFF is used as an interrupt to or from

the emulator system and is defined as input/output via IEEE standard 1149.1 scan system. When TRST is

driven low, EMU1/OFF is configured as OFF. The EMU1/OFF signal, when active low, puts all output drivers

into the high-impedance state. Note that OFF is used exclusively for testing and emulation purposes (not for

multiprocessing applications). Thus, for the OFF feature, the following conditions apply: TRST=low,

EMU0=high, EMU1/OFF = low. Should be pulled up to DVDD with a separate 4.7-kΩ resistor.

† I = Input, O = Output, Z = High-impedance, S = Supply

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