TMS320F datasheet(356/389 Pages) TI

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Emulation Design Considerations

C-21

Design Considerations for Using the XDS510 Emulator

Figure C–11. EMU0/1 Configuration to Meet Timing Requirements of Less 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

EMU0/1-OUT

. . .

Device

EMU0/1

. . .

Device

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 times of less than 25 ns, the modifi-

cation 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.

These seven important points apply to the circuitry shown in Figure C–11 and

the timing shown in Figure C–12:

- Open-collector drivers isolate each board. The EMU0/1 pins are tied

together on each board.

- At the board edge, the EMU0/1 signals are split to provide both input and

output connections. This is required to prevent the open-collector drivers

from acting as latches that can be set only once.

- The EMU0/1 signals are bused down the backplane. Pullup resistors must

be installed as required.

TMS320F Datasheet(PDF) 356 Page - Texas Instruments

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