TMS320VC5509 datasheet(28/122 Pages) TI

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Introduction

April 2001 − Revised September 2004

SPRS163G

Table 2−3. Signal Descriptions (Continued)

TERMINAL

NAME

RESET

CONDITION

BK‡

FUNCTION

I/O/Z†

MULTIPLEXED

SIGNAL NAME

TEST/EMULATION PINS

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

at the TAP output signal (TDO) occur on the falling edge of TCK.

Input

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.

Input

TDO

O/Z

IEEE standard 1149.1 test data output. The contents of the selected

TCK. TDO is in the high-impedance state except when the scanning of

data is in progress.

Hi-Z

TMS

IEEE standard 1149.1 test mode select. Pin with internal pullup device.

This serial control input is clocked into the TAP controller on the rising edge

of TCK.

Input

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. This pin has an

internal pulldown.

Input

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 I/O by way

of the IEEE standard 1149.1 scan system.

Input

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 I/O

by way of 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). Therefore, for the OFF condition, the

following apply: TRST = low, EMU0 = high, EMU1/OFF = low

Input

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

‡ BK = bus keeper (the bus keeper maintains the previous voltage level during reset or while the output pin is not driven), PU = pullup,

PD = pulldown, H = hysteresis input buffer

TMS320VC5509 Datasheet(PDF) 28 Page - Texas Instruments

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