TMS320VC5502 datasheet(124/189 Pages) TI

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nanoseconds (ns)

-1

2.5 V

0.6 V

0.1

SN74LVC1G32

R32

33 W

SN74LVC1G32

0.1

3.3 V

TCK

XDS TRST

XDS EMU1

TRST

EMU1/OFF

EMU0

3.3 V

TMS

TDI

TDO

XDS TMS

XDS TDI

XDS TDO

XDS TCK RTN

XDS TCK

XDS EMU0

TMS320VC5502

Fixed-Point Digital Signal Processor

SPRS166H – APRIL 2001 – REVISED NOVEMBER 2004

Figure 3-54. Good TCK Transition

As the problem may be caused by one or more of the above factors, one or more of the steps outlined

below may be necessary to fix it:

• Avoid using a socket

• Ensure the board design achieves rise times and fall times of less than 3 ns with clean monotonic

edges for the TCK signal.

• For designs where TCK is supplied by the emulation pod, implement noise filtering circuitry on the

target board. A sample circuit is shown in Figure 3-55.

Figure 3-55. Sample Noise Filtering Circuitry

124

Functional Overview

TMS320VC5502 Datasheet(PDF) 124 Page - Texas Instruments

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