TMS320F datasheet(358/389 Pages) TI

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Emulation Design Considerations

C-23

Design Considerations for Using the XDS510 Emulator

Figure C–13. EMU0/1 Configuration With Additional AND Gate to Meet Timing

Requirements of Greater Than 25 ns

Open-

collector

drivers

EMU0/1-IN

Backplane

Target board m

TCK

XCNT_ENABLE

To emulator EMU0

PAL

Pullup

resistor

Open-

collector

drivers

Target board 1

EMU0/1

EMU1 signal from other boards

EMU1

AND

To emulator EMU1

Circuitry required for >25-ns rise/

fall time modification

EMU0/1-OUT

. . .

Device

EMU0/1

. . .

Device

Up to

m boards

Pullup

resistor

Pullup

resistor

Notes:

1) The low time on EMU0/1-IN must be at least one TCK cycle and less than 10

ms. Software sets the EMU0/1-OUT pin

to a high state.

2) To enable the open-collector driver and pullup resistor on EMU1 to provide rise/fall time of greater than 25 ns, the

modification shown in this figure is suggested. Rise times of more than 25 ns can cause the emulator to detect false

edges during the RUNB command or when the external counter selected from the debugger analysis menu is used.

TMS320F Datasheet(PDF) 358 Page - Texas Instruments

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