TMS320VC5402 datasheet(11/68 Pages) TI

11 / 68 page

TMS320VC5402

FIXEDPOINT DIGITAL SIGNAL PROCESSOR

SPRS079E – OCTOBER 1998 – REVISED AUGUST 2000

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

Terminal Functions (Continued)

TERMINAL

NAME

DESCRIPTION

TYPE†

TERMINAL

NAME

DESCRIPTION

TYPE†

TEST PINS (CONTINUED)

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 the IEEE standard 1149.1 scan system.

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 by way of the 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). The OFF feature is selected by the following pin combinations:

TRST = low

EMU0 = high

EMU1/OFF = low

† I = input, O = output, Z = high impedance, S = supply

‡ All revisions of the ’5402 can be operated with an external clock source, provided that the proper voltage levels be driven on the X2/CLKIN

pin. It should be noted that the X2/CLKIN pin is referenced to the device 1.8V power supply (CVDD), rather than the 3V I/O supply (DVDD).

Refer to the recommended operating conditions section of this document for the allowable voltage levels of the X2/CLKIN pin.

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