TNETV2840ENGGU datasheet(22/91 Pages) TI1

22 / 91 page

Introduction

December 1999 − Revised October 2008

SPRS122F

Table 2−3. Signal Descriptions (Continued)

NAME

DESCRIPTION

TYPE†

EMULATION/TEST PINS (CONTINUED)

EMU1/OFF

I/O/Z

Emulator interrupt 1 pin. When TRST is driven high, EMU1/OFF is used as an interrupt to or from the emulator system

and is defined as I/O. When TRST transitions from high to low, then EMU1 operates as OFF. EMU/OFF = 0 puts all

output drivers into the high-impedance state.

Note that OFF is used exclusively for testing and emulation purposes (and not for multiprocessing applications).

Therefore, for the OFF condition, the following conditions apply:

TRST = 0, EMU0 = 1, EMU1 = 0

† I = Input, O = Output, S = Supply, Z = High Impedance

‡ This pin has an internal bus holder controlled by way of the BSCR register in TMS320C54x cLEAD core of DSP subsystem A.

§ This pin is placed in high-impedance when the EMU1/OFF pin operates as OFF and when EMU1/OFF = 0, this case is exclusively for testing

and emulation purposes.

¶ This pin has an internal pullup resistor.

# These pins are Schmitt triggered inputs.

|| This pin is used by Texas Instruments for device testing and should be left unconnected.

kThis pin has an internal pulldown resistor.

hAlthough this pin includes an internal pulldown resistor, a 470-Ω external pulldown is required. If the TRST pin is connected to multiple DSPs,

a buffer is recommended to ensure the VIL and VIH specifications are met.

NOTE: Pins highlighted in grey indicate the multiplexed function of the pin.

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