Texas Instruments TMS320C2XX 用户手册

Designing Your Target System’s Emulator Connector (14-Pin Header)

E-3

Design Considerations for Using XDS510 Emulator

Table E–1. 14-Pin Header Signal Descriptions

EMU0

Emulation pin 0

I

I/O

EMU1

Emulation pin 1

I

I/O

GND

Ground

PD(V

CC

)

Presence detect. Indicates that the emulation
cable is connected and that the target is
powered up. PD should be tied to V

CC

 in the

target system.

I

O

TCK

Test clock. TCK is a 10.368-MHz clock
source from the emulation cable pod. This
signal can be used to drive the system test
clock.

O

I

TCK_RET

Test clock return. Test clock input to the emu-
lator. May be a buffered or unbuffered version
of TCK.

I

O

TDI

Test data input

O

I

TDO

Test data output

I

O

TMS

Test mode select

O

I

TRST

‡

Test reset

O

I

† I = input; O = output
‡ Do not use pullup resistors on TRST: it has an internal pulldown device. In a low-noise

environment, TRST can be left floating. In a high-noise environment, an additional pulldown
resistor may be needed. (The size of this resistor should be based on electrical current
considerations.)