TMS320VC5421 datasheet(15/88 Pages) TI

15 / 88 page

TMS320VC5421

DIGITAL SIGNAL PROCESSOR

SPRS098 – DECEMBER 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

Signal Descriptions (Continued)

NAME

DESCRIPTION

TYPE†

EMULATION/TEST PINS (CONTINUED)

EMU0

I/O/Z

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

EMU1/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.

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 pullup resistor.

§ These pins are Schmitt triggered inputs.

¶ This pin has an internal bus holder controlled by way of the BSCR register in 54x cLEAD core of DSP subsystem A .

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

|| This pin has an internal pulldown resistor.

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