TMS320VC5502 datasheet(32/189 Pages) TI

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TMS320VC5502

Fixed-Point Digital Signal Processor

SPRS166H – APRIL 2001 – REVISED NOVEMBER 2004

Table 2-4. Signal Descriptions (continued)

MULTIPLEXED

OTHER(2)

FUNCTION

NAME

SIGNAL NAME

TYPE(1)

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

TRST

C, L, K

connected or driven low, the device operates in its functional mode, and the IEEE

standard 1149.1 signals are ignored. Pin has an internal pulldown device.

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.

EMU0

I/O/Z

The EMU0 and EMU1/OFF pins must be pulled up when an emulator is not

connected. Internal pullups have been included for the purpose. If the user chooses

to disable these pullups through the XBCR, external pullup resistors must be added

to these two pins.

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:

EMU1/OFF

I/O/Z

•

TRST = low,

•

EMU0 = high,

•

EMU1/OFF = low

The EMU0 and EMU1/OFF pins must be pulled up when an emulator is not

connected. Internal pullups have been included for the purpose. If the user chooses

to disable these pullups through the XBCR, external pullup resistors must be added

to these two pins.

Introduction

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